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Orthophosphates and Diphosphates Containing Zinc and Copper and Zinc and Cobalt
Author(s) -
Bamberger Carlos E.,
Specht Eliot D.
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.tb02327.x
Subject(s) - copper , zinc , solid solution , chemistry , cobalt , phase (matter) , inorganic chemistry , composition (language) , nuclear chemistry , linguistics , philosophy , organic chemistry
Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X‐ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn 3−x Cox(PO 4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ‐Zn 3 (PO 4 )2. Solid solutions of orthophosphates of composition Zn 3−x Cu x (PO 4 )2 exhibited more‐complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu 3 (PO 4 )2, termed here the “ε‐phase,” predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the “η‐phase”) adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the “δ‐phase”), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the “β‐phase”) had the structure of β‐Zn 3 (PO 4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the “‐phase”) exhibited the structure of γ‐Zn 3 (PO 4 )2. Attempts to synthesize Cu + ZnPO 4 and Cu + Cu 2+ Zn 3 (PO 4 )3 were unsuccessful.