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Compounds and Solid Solutions of Cobalt, Copper Phosphates
Author(s) -
Bamberger Carlos E.,
Specht Eliot D.,
Anovitz Lawrence M.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02699.x
Subject(s) - cobalt , triclinic crystal system , copper , solid solution , pyrophosphate , crystallography , chemistry , crystal structure , phosphate , x ray crystallography , inorganic chemistry , solubility , diffraction , materials science , organic chemistry , enzyme , physics , optics
Cobalt phosphates have been synthesized and their thermal behavior examined. The formation of compounds and solid solutions among cobalt and copper phosphates is studied by X‐ray diffraction. Unlimited solubility exists between the pyrophosphates Co 2 P 2 O 7 and Cu 2 P 2 O 7 , the orthophosphates Co 3 (PO 4 ) 2 and Cu 3 (PO 4 ) 2 , and Co 3 (PO 4 ) 2 and Cu 2 P 2 O 7 . X‐ray diffraction indicates that the structures of cobalt and copper pyrophosphate solid solutions vary gradually from one end member to the other. The structures of orthophosphate solid solutions vary in a more complex manner: the change is gradual from Co 3 (PO 4 ) 2 to Co 2 Cu(PO 4 ) 2 . At Co 1.5 Cu 1.5 (PO 4 ) 2 , a new structure ( L ) occurs. At 950°C, CoCu 2 (PO 4 ) 2 also exhibits this structure, which is similar to that of graftonite, Fe 3 (PO 4 ) 2 . CoCu 2 (PO 4 ) 2 is dimorphic, changing reversibly at 1000°C to a triclinic structure ( H ) related to that of Cu 3 (PO 4 ) 2 . From CoCu 2 (PO 4 ) 2 ( H ) to Cu 3 (PO 4 ) 2 , the structure appears to vary gradually. A new phosphate, Cu + Cu 2+ Co 3 (PO 4 ) 3 , has also been synthesized.