| class="wikitable"
!substance
!formula
!birefringence
!band gap eV
!comment
!reference |
| guanidinium hydrogen squarate
|C(NH2)3(HC4O4)
|0.313@546 nm
|
|
|[{{Cite journal |last1=Wang |first1=Hongmei |last2=Wang |first2=Qiang |last3=Wang |first3=Qin |last4=Cao |first4=Liling |last5=Huang |first5=Ling |last6=Gao |first6=Daojiang |last7=Bi |first7=Jian |last8=Zou |first8=Guohong |date=2022-07-06 |title=Yin–Yang Complementarity Strategy Achieving Giant Optical Anisotropy in a Metal-free Birefringent Material C(NH 2 ) 3 (HC 4 O 4 ) |url=https://pubs.acs.org/doi/10.1021/acs.cgd.2c00255 |journal=Crystal Growth & Design |language=en |volume=22 |issue=7 |pages=4236–4242 |doi=10.1021/acs.cgd.2c00255 |bibcode=2022CrGrD..22.4236W |s2cid=249587700 |issn=1528-7483|url-access=subscription }}] |
| |NbSe2I2
|0.313
|
|
|[{{Cite journal |last1=Natarajan |first1=Arul Raj |last2=Ponvijayakanthan |first2=L |last3=Sharma |first3=Vineet Kumar |last4=Pujari |first4=Bhalchandra S |last5=Vaitheeswaran |first5=G |last6=Kanchana |first6=V |date=2021-12-01 |title=Anisotropic transport and optical birefringence of triclinic bulk and monolayer NbX 2 Y 2 (X = S, Se and Y = Cl, Br, I) |url=https://iopscience.iop.org/article/10.1088/1361-648X/ac2116 |journal=Journal of Physics: Condensed Matter |volume=33 |issue=48 |pages=485501 |doi=10.1088/1361-648X/ac2116 |pmid=34433138 |bibcode=2021JPCM...33V5501N |s2cid=237306524 |issn=0953-8984|url-access=subscription }}] |
| |LiBF2C2O4
|0.317@546 nm
|
|
|[{{Cite journal |last1=Cheng |first1=Meng |last2=Jin |first2=Congcong |last3=Jin |first3=Wenqi |last4=Hou |first4=Xueling |date=2023-06-12 |title=Target-Oriented Synthesis of Borate Derivatives Featuring Isolated [B 3 O 3 ] Six-Membered Rings as Structural Features |url=https://pubs.acs.org/doi/10.1021/acs.inorgchem.3c01112 |journal=Inorganic Chemistry |language=en |volume=62 |issue=23 |pages=9209–9216 |doi=10.1021/acs.inorgchem.3c01112 |pmid=37257153 |s2cid=259000539 |issn=0020-1669|url-access=subscription }}] |
| barium cyanurate
|Ba3(C3N3O3)2
|0.32@800 nm
|
|
|[{{Cite journal |last1=Tang |first1=Jian |last2=Liang |first2=Fei |last3=Meng |first3=Xianghe |last4=Kang |first4=Kaijin |last5=Yin |first5=Wenlong |last6=Zeng |first6=Tixian |last7=Xia |first7=Mingjun |last8=Lin |first8=Zheshuai |last9=Yao |first9=Jiyong |last10=Zhang |first10=Guochun |last11=Kang |first11=Bin |date=2019-02-06 |title=Ba 3 (C 3 N 3 O 3 ) 2 : A New Phase of Barium Cyanurate Containing Parallel π-Conjugated Groups as a Birefringent Material Replacement for Calcite |url=https://pubs.acs.org/doi/10.1021/acs.cgd.8b01782 |journal=Crystal Growth & Design |language=en |volume=19 |issue=2 |pages=568–572 |doi=10.1021/acs.cgd.8b01782 |bibcode=2019CrGrD..19..568T |s2cid=104313088 |issn=1528-7483|url-access=subscription }}] |
| pentazinc dicyanurate tetrahydroxide
|Zn5(OH)4(C3N3O3)2
|0.32@400 nm
|
|
|[{{Cite journal |last1=Liu |first1=Xiaomeng |last2=Gong |first2=Pifu |last3=Lin |first3=Zheshuai |date=2021-08-02 |title=AZn 4 (OH) 4 (C 3 N 3 O 3 ) 2 (A = Mg, Zn): Two Zn-Based Cyanurate Crystals with Various Cation Coordination and Large Birefringence |url=https://pubs.acs.org/doi/10.1021/acs.inorgchem.1c01808 |journal=Inorganic Chemistry |language=en |volume=60 |issue=15 |pages=10890–10894 |doi=10.1021/acs.inorgchem.1c01808 |pmid=34269585 |s2cid=235961771 |issn=0020-1669|url-access=subscription }}] |
| magnesium tetrazinc dicyanurate tetrahydroxide
|MgZn4(OH)4(C3N3O3)2
|0.32@400 nm
|
|
| |
| pyridinium antimony oxalate difluoride hydrate
|[C(NH2)3]Sb(C2O4)F2·H2O
|0.323@546 nm
|
|
|[{{Cite journal |last1=Zhang |first1=Die |last2=Wang |first2=Qiang |last3=Ren |first3=Liying |last4=Cao |first4=Liling |last5=Huang |first5=Ling |last6=Gao |first6=Daojiang |last7=Bi |first7=Jian |last8=Zou |first8=Guohong |date=2022-08-08 |title=Sharp Enhancement of Birefringence in Antimony Oxalates Achieved by the Cation–Anion Synergetic Interaction Strategy |url=https://pubs.acs.org/doi/10.1021/acs.inorgchem.2c02262 |journal=Inorganic Chemistry |language=en |volume=61 |issue=31 |pages=12481–12488 |doi=10.1021/acs.inorgchem.2c02262 |pmid=35894629 |s2cid=251103920 |issn=0020-1669|url-access=subscription }}] |
| |Cs2Sb2(C2O4)2-F4·H2O
|0.325@546 nm
|
|
|[{{Cite journal |last1=Zhang |first1=Die |last2=Wang |first2=Qiang |last3=Zheng |first3=Ting |last4=Cao |first4=Liling |last5=Ok |first5=Kang Min |last6=Gao |first6=Daojiang |last7=Bi |first7=Jian |last8=Huang |first8=Ling |last9=Zou |first9=Guohong |date=November 2022 |title=Cation-anion synergetic interactions achieving tunable birefringence in quasi-one-dimensional antimony(III) fluoride oxalates |journal=Science China Materials |language=en |volume=65 |issue=11 |pages=3115–3124 |doi=10.1007/s40843-022-2088-0 |s2cid=250361199 |issn=2095-8226|doi-access=free }}] |
| |β-(C3H7N6)2Cl2·H2O
|0.33–0.38@550 nm
|
|
|[{{Cite journal |last1=Shen |first1=Yaoguo |last2=Ma |first2=Liang |last3=Dong |first3=Guofa |last4=Yu |first4=Hualiang |last5=Luo |first5=Junhua |date=2023 |title=β-(C 3 H 7 N 6 ) 2 Cl 2 ·H 2 O and (C 3 H 7 N 6 )F·H 2 O: two UV birefringent crystals induced by uniformly aligned structural groups |url=http://xlink.rsc.org/?DOI=D2QI02535C |journal=Inorganic Chemistry Frontiers |language=en |volume=10 |issue=7 |pages=2022–2029 |doi=10.1039/D2QI02535C |s2cid=256715995 |issn=2052-1553|url-access=subscription }}] |
| |(C3H7N6)F·H2O
|0.33–0.38@550 nm
|
|
| |
| scandium diiodate nitrate
|Sc(IO3)2(NO3)
|0.348 at 546 nm
|
|
|[{{Cite journal |last1=Wu |first1=Chao |last2=Jiang |first2=Xingxing |last3=Wang |first3=Zujian |last4=Lin |first4=Lin |last5=Lin |first5=Zheshuai |last6=Huang |first6=Zhipeng |last7=Long |first7=Xifa |last8=Humphrey |first8=Mark G. |last9=Zhang |first9=Chi |date=2021-02-15 |title=Giant Optical Anisotropy in the UV-Transparent 2D Nonlinear Optical Material Sc(IO 3 ) 2 (NO 3 ) |url=https://onlinelibrary.wiley.com/doi/10.1002/anie.202012456 |journal=Angewandte Chemie International Edition |language=en |volume=60 |issue=7 |pages=3464–3468 |doi=10.1002/anie.202012456 |pmid=33146456 |hdl=1885/251539 |s2cid=226251002 |issn=1433-7851|hdl-access=free }}] |
| potassium indium tetra(iso-cyamelurate) octadecahydrate
|K0.5In0.5(H2C6N7O3)2·9H2O
|0.35@1064 nm
|4.05 eV
|
|[{{Cite journal |last1=Zhang |first1=Limei |last2=Wang |first2=Fangyan |last3=Zhang |first3=Xinyuan |last4=Liang |first4=Fei |last5=Hu |first5=Zhanggui |last6=Wu |first6=Yicheng |date=2024-01-08 |title=Synthesis and Characterization of Metal Iso-cyamelurate K 0.5 In 0.5 (H 2 C 6 N 7 O 3 ) 2 ·9H 2 O with Large Birefringence |url=https://pubs.acs.org/doi/10.1021/acs.cgd.3c01248 |journal=Crystal Growth & Design |volume=24 |issue=2 |pages=627–631 |language=en |doi=10.1021/acs.cgd.3c01248 |bibcode=2024CrGrD..24..627Z |issn=1528-7483|url-access=subscription }}] |
| calcium squarate
|CaC4O4
|0.35@1064
|
|
|[{{Cite journal |last1=Tong |first1=Tinghao |last2=Zhang |first2=Wenyao |last3=Yang |first3=Zhihua |last4=Pan |first4=Shilie |date=2021-01-18 |title=Series of Crystals with Giant Optical Anisotropy: A Targeted Strategic Research |url=https://onlinelibrary.wiley.com/doi/10.1002/anie.202011006 |journal=Angewandte Chemie International Edition |language=en |volume=60 |issue=3 |pages=1332–1338 |doi=10.1002/anie.202011006 |pmid=33025703 |s2cid=222184668 |issn=1433-7851|url-access=subscription }}] |
| tristrontium dicyanurate
|β-Sr3(C3N3O3)
|0.35
|
|
| |
| cerium difluoride sulfate
|CeF2(SO4)
|0.361
|
|
|[{{Cite journal |last1=Wu |first1=Chao |last2=Wu |first2=Tianhui |last3=Jiang |first3=Xingxing |last4=Wang |first4=Zujian |last5=Sha |first5=Hongyuan |last6=Lin |first6=Lin |last7=Lin |first7=Zheshuai |last8=Huang |first8=Zhipeng |last9=Long |first9=Xifa |last10=Humphrey |first10=Mark G. |last11=Zhang |first11=Chi |date=2021-03-24 |title=Large Second-Harmonic Response and Giant Birefringence of CeF 2 (SO 4 ) Induced by Highly Polarizable Polyhedra |url=https://pubs.acs.org/doi/10.1021/jacs.1c00416 |journal=Journal of the American Chemical Society |language=en |volume=143 |issue=11 |pages=4138–4142 |doi=10.1021/jacs.1c00416 |pmid=33625206 |bibcode=2021JAChS.143.4138W |hdl=1885/251607 |s2cid=232039261 |issn=0002-7863|hdl-access=free }}] |
| |Na4Ba3(S2)4S3
|0.37 at 1064 nm
|
|
|[{{Cite journal |last1=Li |first1=Guangmao |last2=Yang |first2=Zhihua |last3=Hou |first3=Xueling |last4=Pan |first4=Shilie |date=2023-05-22 |title=Chain-like [S x ] ( x =2–6) Units Realizing Giant Birefringence with Transparency in the Near-Infrared for Optoelectronic Materials |url=https://onlinelibrary.wiley.com/doi/10.1002/ange.202303711 |journal=Angewandte Chemie |language=en |volume=135 |issue=22 |doi=10.1002/ange.202303711 |bibcode=2023AngCh.135E3711L |issn=0044-8249|url-access=subscription }}] |
| guanidinium hydrogen oxalate hydrate
|[C(NH2)3]HC2O4·H2O
|0.371@532 nm
|
|
|[{{Cite journal |last1=Xia |first1=Ming |last2=Mutailipu |first2=Miriding |last3=Li |first3=Fuming |last4=Yang |first4=Zhihua |last5=Pan |first5=Shilie |date=2021-03-03 |title=Finding Short-Wavelength Birefringent Crystals with Large Optical Anisotropy Activated by π-Conjugated [C(NH 2 ) 3 ] Units |url=https://pubs.acs.org/doi/10.1021/acs.cgd.1c00024 |journal=Crystal Growth & Design |language=en |volume=21 |issue=3 |pages=1869–1877 |doi=10.1021/acs.cgd.1c00024 |bibcode=2021CrGrD..21.1869X |s2cid=234017348 |issn=1528-7483|url-access=subscription }}] |
| |Cs2Pb4Br10
|0.392 @ 550 nm
|
|
|[{{Cite journal |last1=Chen |first1=Bo |last2=Chen |first2=Hao |last3=Zhang |first3=Shaobin |last4=Shen |first4=Yaoguo |date=November 2023 |title=Cs2Pb4Br10: A layered perovskite shows large birefringence |url=https://linkinghub.elsevier.com/retrieve/pii/S1387700323008468 |journal=Inorganic Chemistry Communications |language=en |volume=157 |pages=111234 |doi=10.1016/j.inoche.2023.111234|s2cid=261268019 |url-access=subscription }}] |
| |RbNH4(H2C3N3O3)2·2H2O
|0.40 @ 1064 nm
|5.24
|
|[{{Cite journal |last1=Aibibula |first1=Mukeremu |last2=Wang |first2=Li |date=October 2020 |title=A UV birefringent crystal: RbNH4(H2C3N3O3)2·2H2O |url=https://linkinghub.elsevier.com/retrieve/pii/S1387700320307395 |journal=Inorganic Chemistry Communications |language=en |volume=120 |pages=108149 |doi=10.1016/j.inoche.2020.108149|s2cid=224903708 |url-access=subscription }}] |
| dipotasium hydrogen trithiocyanate hemihydrate
|K4(HC3N3S3)2·H2O
|0.402 @550 nm
|
|
|[{{Cite journal |last1=Xu |first1=Qianting |last2=Liu |first2=Youchao |last3=Wu |first3=Qingchen |last4=Hou |first4=Linxi |last5=Li |first5=Yanqiang |last6=Li |first6=Lina |last7=Lin |first7=Zheshuai |last8=Zhao |first8=Sangen |last9=Luo |first9=Junhua |date=August 2023 |title=A BBO-like trithiocyanate with significantly enhanced birefringence and second-harmonic generation |journal=Science China Materials |language=en |volume=66 |issue=8 |pages=3271–3277 |doi=10.1007/s40843-023-2439-8 |s2cid=260337409 |issn=2095-8226|doi-access=free }}] |
| |K1.03(NH4)0.97(I5O12)(IO3)
|0.405 @546 nm
|
|
|[{{Cite journal |last1=Ma |first1=Nan |last2=Chen |first2=Jin |last3=Li |first3=Bing-Xuan |last4=Hu |first4=Chun-Li |last5=Mao |first5=Jiang-Gao |date=2023-07-25 |title=(NH 4 ) 2 (I 5 O 12 )(IO 3 ) and K 1.03 (NH 4 ) 0.97 (I 5 O 12 )(IO 3 ): Mixed-Valent Polyiodates with Unprecedented I 5 O 12 − Unit Exhibiting Strong Second-Harmonic Generation Responses and Giant Birefringence |url=https://onlinelibrary.wiley.com/doi/10.1002/smll.202304388 |journal=Small |volume=19 |issue=47 |pages=e2304388 |language=en |doi=10.1002/smll.202304388 |pmid=37490526 |s2cid=260188798 |issn=1613-6810|url-access=subscription }}] |
| LCHCY hydroisocyanurate
|Li2Ca(H2C3N3O3)4·6H2O
|0.407@800 nm
|
|
|[{{Cite journal |last1=Meng |first1=Xianghe |last2=Liang |first2=Fei |last3=Tang |first3=Jian |last4=Kang |first4=Kaijin |last5=Yin |first5=Wenlong |last6=Zeng |first6=Tixian |last7=Kang |first7=Bin |last8=Lin |first8=Zheshuai |last9=Xia |first9=Mingjun |date=2019 |title=LiO 4 tetrahedra lock the alignment of π-conjugated layers to maximize optical anisotropy in metal hydroisocyanurates |url=http://xlink.rsc.org/?DOI=C9QI01047E |journal=Inorganic Chemistry Frontiers |language=en |volume=6 |issue=10 |pages=2850–2854 |doi=10.1039/C9QI01047E |s2cid=203013744 |issn=2052-1553|url-access=subscription }}] |
| guanidinium dihydrogen cyanurate
|C(NH2)3(H2C3N3O3)
|0.419@400 nm
|
|UV cutoff 238 nm
|[{{Cite journal |last1=Hao |first1=Xia |last2=Lin |first2=Chensheng |last3=Luo |first3=Min |last4=Zhou |first4=Yuqiao |last5=Ye |first5=Ning |last6=Shangguan |first6=Enbo |date=2023-05-22 |title=Cs 2 Mg(H 2 C 3 N 3 S 3 ) 4 ·8H 2 O: An Excellent Birefringent Material with Giant Optical Anisotropy in π-Conjugated Trithiocyanurate |url=https://pubs.acs.org/doi/10.1021/acs.inorgchem.3c00802 |journal=Inorganic Chemistry |language=en |volume=62 |issue=20 |pages=7611–7616 |doi=10.1021/acs.inorgchem.3c00802 |pmid=37167341 |s2cid=258638521 |issn=0020-1669|url-access=subscription }}] |
| |(NH4)2(I5O12)(IO3)
|0.431 @546 nm
|
|
| |
| tripotassium cyamelurate dihydrate
|K3C6N7O3·2H2O
|0.446@1064 nm
|
|
|[{{cite journal |last1=Zhang |first1=Xinyuan |last2=Du |first2=Xiaoguang |last3=Wang |first3=Jinhui |last4=Wang |first4=Fangyan |last5=Liang |first5=Fei |last6=Hu |first6=Zhanggui |last7=Lin |first7=Zheshuai |last8=Wu |first8=Yicheng |title=K 3 C 6 N 7 O 3 ·2H 2 O: A Multifunctional Nonlinear Optical Cyamelurate Crystal with Colossal π-Conjugated Orbitals |journal=ACS Applied Materials & Interfaces |date=30 November 2022 |volume=14 |issue=47 |pages=53074–53080 |doi=10.1021/acsami.2c15835|pmid=36379003 |s2cid=253551844 }}] |
| |Al4(P2S6)3
|0.47 @ 2050 nm
|
|
|[{{Cite journal |last1=Yao |first1=Li-Jia |last2=Hu |first2=Chun-Li |last3=Fang |first3=Zhi |last4=Mao |first4=Jiang-Gao |date=November 2022 |title=Hg2P2S6: A layered mercury hexathiodiphosphate (IV) with large birefringence |url=https://linkinghub.elsevier.com/retrieve/pii/S0022459622005588 |journal=Journal of Solid State Chemistry |language=en |volume=315 |pages=123433 |doi=10.1016/j.jssc.2022.123433|bibcode=2022JSSCh.31523433Y |url-access=subscription }}] |
| sodium hydrogen squarate hydrate
|NaHC4O4·H2O
|0.52 at 1064 nm
|
|
|[{{Cite journal |last1=Zhang |first1=Xiaodong |last2=Cao |first2=Dongxu |last3=Yang |first3=Daqing |last4=Wang |first4=Ying |last5=Wu |first5=Kui |last6=Lee |first6=Ming-Hsien |last7=Zhang |first7=Bingbing |date=2022-04-04 |title=Finding the First Squarates Nonlinear Optical Crystal NaHC 4 O 4 ·H 2 O with Strong Second Harmonic Generation and Giant Birefringence |url=https://pubs.acs.org/doi/10.1021/acsmaterialslett.2c00114 |journal=ACS Materials Letters |language=en |volume=4 |issue=4 |pages=572–576 |doi=10.1021/acsmaterialslett.2c00114 |s2cid=247352687 |issn=2639-4979|url-access=subscription }}] |
| |HgB2S4
|0.52 at 1064 nm
|
|
|[{{Cite journal |last1=Huang |first1=Yi |last2=Zhang |first2=Yong |last3=Chu |first3=Dongdong |last4=Yang |first4=Zhihua |last5=Li |first5=Guangmao |last6=Pan |first6=Shilie |date=2023-06-13 |title=HgB 2 S 4 : A d 10 Metal Thioborate with Giant Birefringence and Wide Band Gap |url=https://pubs.acs.org/doi/10.1021/acs.chemmater.3c00937 |journal=Chemistry of Materials |language=en |volume=35 |issue=11 |pages=4556–4563 |doi=10.1021/acs.chemmater.3c00937 |s2cid=258893875 |issn=0897-4756|url-access=subscription }}] |
| tricaesium tricyanomelaminate hydrate
|Cs3C6N9•H2O
|0.52@550 nm
|
|
|[{{Cite journal |last1=Li |first1=Yanqiang |last2=Wu |first2=Qingchen |last3=Lin |first3=Zheshuai |last4=Liu |first4=Youchao |last5=Zhou |first5=Yang |last6=Chen |first6=Xin |last7=Li |first7=Minjuan |last8=Hong |first8=Maochun |last9=Luo |first9=Junhua |last10=Zhao |first10=Sangen |date=April 2022 |title=Maximizing the linear and nonlinear optical responses of alkaline tricyanomelaminate |journal=Fundamental Research |volume=3 |issue=6 |pages=974–978 |language=en |doi=10.1016/j.fmre.2022.04.009|s2cid=248357803 |doi-access=free |pmid=38932999 |pmc=11197770 }}] |
| |CrSbSe3
|0.56 at 650 nm
|
|
|[{{Cite journal |last1=Sujith |first1=C.P. |last2=Joseph |first2=Saji |last3=Mathew |first3=Thomas |last4=Mathew |first4=Vincent |date=August 2022 |title=Exploring the electronic and optical anisotropy of quasi-one-dimensional ternary chalcogenide CrSbSe3: a DFT study |url=https://linkinghub.elsevier.com/retrieve/pii/S1293255822001212 |journal=Solid State Sciences |language=en |volume=130 |pages=106926 |doi=10.1016/j.solidstatesciences.2022.106926|bibcode=2022SSSci.13006926S |s2cid=249302412 |url-access=subscription }}] |
| |Cs2S6
|0.58@1064 nm
|
|
| |
| trithiocyanurate
|Cs2Mg(H2C3N3S3)4·8H2O
|0.58@800 nm
|
|UV cutoff 374 nm
| |
| |ZrTe5
|0.58 @ 942 nm
|
|
|[{{Cite journal |last1=Guo |first1=Zhengfeng |last2=Gu |first2=Honggang |last3=Fang |first3=Mingsheng |last4=Song |first4=Baokun |last5=Wang |first5=Wei |last6=Chen |first6=Xiuguo |last7=Zhang |first7=Chuanwei |last8=Jiang |first8=Hao |last9=Wang |first9=Lin |last10=Liu |first10=Shiyuan |date=2021-05-03 |title=Complete Dielectric Tensor and Giant Optical Anisotropy in Quasi-One-Dimensional ZrTe 5 |url=https://pubs.acs.org/doi/10.1021/acsmaterialslett.1c00026 |journal=ACS Materials Letters |language=en |volume=3 |issue=5 |pages=525–534 |doi=10.1021/acsmaterialslett.1c00026 |s2cid=234868354 |issn=2639-4979|url-access=subscription }}] |
| |Ba2HgTe5
|0.643@2090 nm
|1.28
|
|[{{Cite journal |last1=Sun |first1=Mengran |last2=Yao |first2=Jiyong |date=2022 |title=Ba 2 HgTe 5 : a Hg-based telluride with giant birefringence induced by linear [HgTe 2 ] units |url=http://xlink.rsc.org/?DOI=D2QI01387H |journal=Inorganic Chemistry Frontiers |language=en |volume=9 |issue=19 |pages=5024–5031 |doi=10.1039/D2QI01387H |s2cid=251422301 |issn=2052-1553|url-access=subscription }}] |
| mercury hexathiodiphosphate
|Hg2P2S6
|0.65@546 nm,
0.50 @ 1064 nm,
0.48 @2050 nm
|
|
| |
| |Ba6Sb6O2S13
|0.66 at 2050 nm
|
|black; thermal conductivity of 0.25 W m−1 K−1 at 700 K
|[{{Cite journal |last1=Shi |first1=Yong-Fang |last2=Zhou |first2=Sheng-Hua |last3=Liu |first3=Peng-Fei |last4=Wu |first4=Xin-Tao |last5=Lin |first5=Hua |last6=Zhu |first6=Qi-Long |date=2023 |title=A unique [Sb 6 O 2 S 13 ] 12− finite chain in oxychalcogenide Ba 6 Sb 6 O 2 S 13 leading to ultra-low thermal conductivity and giant birefringence |url=http://xlink.rsc.org/?DOI=D3QI00850A |journal=Inorganic Chemistry Frontiers |language=en |volume=10 |issue=15 |pages=4425–4434 |doi=10.1039/D3QI00850A |s2cid=259457678 |issn=2052-1553|url-access=subscription }}] |
| |Sn2PO4I
|0.664@546 nm
|
|
|[{{Cite journal |last1=Guo |first1=Jingyu |last2=Tudi |first2=Abudukadi |last3=Han |first3=Shujuan |last4=Yang |first4=Zhihua |last5=Pan |first5=Shilie |date=2021-11-15 |title=Sn 2 PO 4 I: An Excellent Birefringent Material with Giant Optical Anisotropy in Non π-Conjugated Phosphate |url=https://onlinelibrary.wiley.com/doi/10.1002/anie.202111604 |journal=Angewandte Chemie International Edition |language=en |volume=60 |issue=47 |pages=24901–24904 |doi=10.1002/anie.202111604 |pmid=34523205 |s2cid=237514418 |issn=1433-7851|url-access=subscription }}] |
| |Na2BP2
|0.68
|
|
| |
| hexagonal boron nitride
|h-BN
|0.7
|
|
|[{{cite journal |last1=Segura |first1=A. |last2=Artús |first2=L. |last3=Cuscó |first3=R. |last4=Taniguchi |first4=T. |last5=Cassabois |first5=G. |last6=Gil |first6=B. |title=Natural optical anisotropy of h-BN: Highest giant birefringence in a bulk crystal through the mid-infrared to ultraviolet range |journal=Physical Review Materials |date=6 February 2018 |volume=2 |issue=2 |page=024001 |doi=10.1103/PhysRevMaterials.2.024001|bibcode=2018PhRvM...2b4001S |hdl=10261/161209 |s2cid=115229555 |hdl-access=free }}] |
| |BaTiSe3
|0.7
|
|
| |
| |BaTiS3
|0.76
|
|
|[{{Cite journal |last1=Mathew |first1=Thomas |last2=Rahul K |first2=Suseel |last3=Joseph |first3=Saji |last4=Mathew |first4=Vincent |date=May 2021 |title=Density functional study of structural, electronic and optical properties of quasi-one-dimensional compounds BaTiX 3 ( X = S , Se ) |url=https://linkinghub.elsevier.com/retrieve/pii/S0749603621000574 |journal=Superlattices and Microstructures |language=en |volume=153 |pages=106859 |doi=10.1016/j.spmi.2021.106859|bibcode=2021SuMi..15306859M |s2cid=233647623 |url-access=subscription }}][{{Cite journal |last1=Niu |first1=Shanyuan |last2=Joe |first2=Graham |last3=Zhao |first3=Huan |last4=Zhou |first4=Yucheng |last5=Orvis |first5=Thomas |last6=Huyan |first6=Huaixun |last7=Salman |first7=Jad |last8=Mahalingam |first8=Krishnamurthy |last9=Urwin |first9=Brittany |last10=Wu |first10=Jiangbin |last11=Liu |first11=Yang |last12=Tiwald |first12=Thomas E. |last13=Cronin |first13=Stephen B. |last14=Howe |first14=Brandon M. |last15=Mecklenburg |first15=Matthew |date=July 2018 |title=Giant optical anisotropy in a quasi-one-dimensional crystal |url=https://www.nature.com/articles/s41566-018-0189-1 |journal=Nature Photonics |language=en |volume=12 |issue=7 |pages=392–396 |doi=10.1038/s41566-018-0189-1 |bibcode=2018NaPho..12..392N |s2cid=256708704 |issn=1749-4885|url-access=subscription }}] |
| vanadium dioxide
|VO2
|>0.9
|
|in thin film
|[{{Cite journal |last1=John |first1=Jimmy |last2=Slassi |first2=Amine |last3=Sun |first3=Jianing |last4=Sun |first4=Yifei |last5=Bachelet |first5=Romain |last6=Pénuelas |first6=José |last7=Saint-Girons |first7=Guillaume |last8=Orobtchouk |first8=Régis |last9=Ramanathan |first9=Shriram |last10=Calzolari |first10=Arrigo |last11=Cueff |first11=Sébastien |date=2022-08-23 |title=Tunable optical anisotropy in epitaxial phase-change VO 2 thin films |journal=Nanophotonics |language=en |volume=11 |issue=17 |pages=3913–3922 |doi=10.1515/nanoph-2022-0153 |bibcode=2022Nanop..11..153J |s2cid=249205052 |issn=2192-8614|doi-access=free |pmid=39635168 |pmc=11501475 }}] |
| sodium rhodizonate
|Na2C6O6
|1.35@2500
|1.6
|brown
| |
| molybdenum ditelluride
|MoTe2
|1.54 mid IR
|
|
|[{{Cite journal |last1=Munkhbat |first1=Battulga |last2=Wróbel |first2=Piotr |last3=Antosiewicz |first3=Tomasz J. |last4=Shegai |first4=Timur O. |date=2022-07-20 |title=Optical Constants of Several Multilayer Transition Metal Dichalcogenides Measured by Spectroscopic Ellipsometry in the 300–1700 nm Range: High Index, Anisotropy, and Hyperbolicity |journal=ACS Photonics |language=en |volume=9 |issue=7 |pages=2398–2407 |doi=10.1021/acsphotonics.2c00433 |issn=2330-4022 |pmc=9306003 |pmid=35880067}}] |
| tungsten disulfide
|WS2
|1.95
|
|refractive indexes 4.96, 3.01
|[{{Cite journal |last1=Deng |first1=Nan |last2=Long |first2=Hua |last3=Wang |first3=Kun |last4=Han |first4=Xiaobo |last5=Wang |first5=Bing |last6=Wang |first6=Kai |last7=Lu |first7=Peixiang |date=2022-08-20 |title=Giant optical anisotropy of WS 2 flakes in the visible region characterized by Au substrate assisted near-field optical microscopy |url=https://iopscience.iop.org/article/10.1088/1361-6528/ac6c96 |journal=Nanotechnology |volume=33 |issue=34 |pages=345201 |doi=10.1088/1361-6528/ac6c96 |pmid=35508119 |bibcode=2022Nanot..33H5201D |s2cid=248526934 |issn=0957-4484|url-access=subscription }}] |
| |Sr9/8TiS3
|2.1 in mid IR
|
|ne = 4.5 no = 2.4
| |