Silver phosphate
Crystal structure | |||||||||||||||||||
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__ Ag + __ P 5+ __ O 2− | |||||||||||||||||||
General | |||||||||||||||||||
Surname | Silver phosphate | ||||||||||||||||||
other names |
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Ratio formula | Ag 3 PO 4 | ||||||||||||||||||
Brief description |
yellow solid |
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External identifiers / databases | |||||||||||||||||||
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properties | |||||||||||||||||||
Molar mass | 418.58 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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density |
6.390 g cm −3 |
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Melting point |
849 ° C |
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solubility |
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Refractive index |
1.975 |
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safety instructions | |||||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C |
Silver phosphate (more precisely silver orthophosphate) is an inorganic chemical compound . Along with silver pyrophosphate Ag 4 P 2 O 7 and silver metaphosphate AgPO 3, it is one of the phosphates of silver .
Extraction and presentation
Silver phosphate can be obtained by reacting potassium phosphate with silver nitrate .
properties
Silver phosphate is a yellow solid that is very poorly soluble in water and gradually turns black when exposed to light.
Ag 3 PO 4 has a cubic crystal structure in the space group P 4 3 n (space group no. 218) with the lattice parameter a = 603 pm and two formula units per unit cell . At 520 ° C, the transition to a likewise cubic high-temperature modification occurs, which crystallizes isotypically to γ-Na 3 PO 4 .
use
Silver phosphate is used in photographic emulsions and in drugs.
literature
- Yingpu Bi, Hongyan Hu, Shuxin Ouyang, Gongxuan Lu, Junyu Cao, Jinhua Ye: Photocatalytic and photoelectric properties of cubic Ag3PO4 sub-microcrystals with sharp corners and edges. (PDF; 10.7 MB) In: Chemical Communications. 48, 2012, p. 3748, doi : 10.1039 / c2cc30363a .
Individual evidence
- ↑ a b c d e f data sheet Silver phosphate, 98% from Sigma-Aldrich , accessed on July 27, 2013 ( PDF ).
- ^ A b c Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 290 ( limited preview in Google Book Search).
- ^ A b Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 483 ( limited preview in Google Book search).
- ↑ External identifiers or database links to silver pyrophosphate : CAS number: 13465-97-9, EC number: 236-713-0, ECHA InfoCard: 100.033.361 , PubChem : 166821 , ChemSpider : 145953 , Wikidata : Q24630107 .
- ↑ External identifiers of or database links to silver metaphosphate: CAS number: 13465-96-8, EC number: 236-712-5, ECHA InfoCard: 100.033.360 , PubChem : 16172267 , ChemSpider : 10790117 , Wikidata : Q4291662 .
- ^ Theodore L. Brown, Bruce Edward Bursten, Harold Eugene LeMay: Chemistry: Studying compact . Pearson Deutschland GmbH, 2011, ISBN 3-86894-122-3 , p. 156 ( limited preview in Google Book search).
- ^ R. Masse, I, Tordjman, A. Durif: Affinement de la structure cristalline du monophosphate d'argent Ag 3 PO 4 . Existence d'une forme haute témperature . In: Journal of Crystallography . No. 144 , 1976, pp. 76-81 , doi : 10.1524 / zkri.1976.144.1-6.76 .