Samarium(III) fluoride

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| Verifiedfields = changed

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| verifiedrevid = 476999201

| ImageFile = Kristallstruktur Yttrium(III)-fluorid.png

| ImageSize =

| IUPACName = samarium(III) fluoride

| OtherNames = samarium trifluoride
trifluorosamarium

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 13765-24-7

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 75536

| InChI = 1/3FH.Sm/h3*1H;/q;;;+3/p-3

| InChIKey = OJIKOZJGHCVMDC-DFZHHIFOAV

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/3FH.Sm/h3*1H;/q;;;+3/p-3

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = OJIKOZJGHCVMDC-UHFFFAOYSA-K

| EINECS = 237-367-3

| PubChem = 83714

| SMILES = F[Sm](F)F

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|Section2={{Chembox Properties

| Formula = SmF₃

| MolarMass = 207.36 g/mol

| Appearance = Yellow odorless powder

| Density = 6.6 g/cm³ at 20 °C

| MeltingPtC = 1306

| BoilingPtC = 2427

| Solubility = Insoluble

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|Section3={{Chembox Structure

| CrystalStruct = Orthorhombic, oP16, SpaceGroup = Pnma, No. 62

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|Section7={{Chembox Hazards

| MainHazards =

| GHSPictograms = {{GHS06}}{{GHS07}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|301|311|315|319|331}}

| PPhrases = {{P-phrases|261|264|270|271|280|301+310|302+352|304+340|305+351+338|311|312|321|322|330|332+313|337+313|361|362|363|403+233|405|501}}

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|Section4={{Chembox Related

| OtherAnions = Samarium(III) chloride
Samarium(III) bromide
Samarium(III) iodide

| OtherCations = Samarium(II) fluoride

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Samarium(III) fluoride (Sm F₃) is a slightly hygroscopic solid fluoride. Conditions/substances to avoid are: open flame, moisture, strong acids.

Preparation

Samarium(III) fluoride can be obtained by reacting SmCl₃ or Sm₂(CO₃)₃ with 40% hydrofluoric acid:王亚军, 刘前, 索全伶, 等. 稀土氟化物的沉淀方法及组成研究[J]. 稀土, 2000, 21(1):14-18.

:{{chem2|SmCl3 + 3 HF → SmF3↓ + 3 HCl}}

:{{chem2|Sm2(CO3)3 + 6 HF → 2 SmF3 + 3 H2O + 3 CO2↑}}

Samarium(III) fluoride can also be produced by hydrothermal reaction of samarium nitrate and sodium fluroborate at 200 °C.孙元平, 贾佩云, 王芳, 等. 水热条件下稀土氟化物形貌的规律性生长[J]. 中国陶瓷, 2013(6).

Properties

= Chemical =

Samarium(III) fluoride reacts with some reducing agents at high temperatures to obtain samarium(II) fluoride:

: $\mathsf{ 4 SmF_3 + C \ \xrightarrow{2000^oC}\ 4 SmF_2 + CF_4 }$

: $\mathsf{ 2 SmF_3 + Sm \ \xrightarrow{1800^oC}\ 3 SmF_2 }$

= Physical =

At room temperature, samarium(III) fluoride has orthorhombic structure with space group Pnma – β-YF₃ type with lattice constants a = 666,9 pm, b = 705,9 pm, c = 440,5 pm. Above 495 °C, it has the rhombohedral LaF₃ structure (space group P3cl) – with lattice constants a = 707, c = 724 pm.{{Cite journal |last1=Rotereau |first1=K |last2=Daniel |first2=Ph |last3=Desert |first3=A |last4=Gesland |first4=J Y |date=1998-02-16 |title=The high-temperature phase transition in samarium fluoride, : structural and vibrational investigation |url=https://iopscience.iop.org/article/10.1088/0953-8984/10/6/026 |journal=Journal of Physics: Condensed Matter |volume=10 |issue=6 |pages=1431–1446 |doi=10.1088/0953-8984/10/6/026 |bibcode=1998JPCM...10.1431R |s2cid=250841162 |issn=0953-8984|url-access=subscription }}

References

Category:Fluorides

Category:Lanthanide halides

Category:Samarium(III) compounds