Actinium(III) phosphate

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| OtherNames = Actinium monophosphate

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| SMILES = [O-]P(=O)([O-])[O-].[Ac+3]

| StdInChI=1S/Ac.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+3;/p-3

| StdInChIKey=PVLPTTWSKILMQQ-UHFFFAOYSA-K

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| Section2 = {{Chembox Properties

| Formula = AcPO₄

| MolarMass = 321.9714 g/mol

| Appearance = White solid

| Density = 5.48 g/cm³

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| CrystalStruct = hexagonal{{cite journal |doi=10.1107/S0365110X48000703 |last1=Zachariasen |date=1948 |first1=W. H. |pages=265–268 |volume=1 |journal=Acta Crystallographica |title=Crystal chemical studies of the 5f-series of elements. I. New structure types |issue=5|doi-access=free |bibcode=1948AcCry...1..265Z }}

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Actinium(III) phosphate is a white-colored chemical compound of the radioactive element actinium. This compound was created by reacting actinium(III) chloride with monosodium phosphate in aqueous hydrochloric acid. This resulted in the hemihydrate AcPO₄·1/2H₂O, whose structure was confirmed by x-ray diffraction to match that of lanthanum phosphate. To become anhydrous, it was heated to 700 °C, which resulted in a solid that was black (presumably due to the presence of impurities), and whose specific X-ray structure did not match that of other known correspond to other actinide phosphates.{{cite book |author1=the University of Michigan |title=The Preparation of Actinium Compounds |date=1948 |publisher=U.S. Atomic Energy Commission, Technical Information Division |pages=4 |url=https://books.google.com/books?id=mQDgF9bR2qgC |access-date=16 April 2021 |language=English}}