Orthophosphates and diphosphates containing zinc and copper and zinc and cobalt

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1998.tb02327.x· OSTI ID:616223

Bamberger, C E; Specht, E D ^[1]

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1. Oak Ridge National Lab., TN (United States)

Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1,000 C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn{sub 3{minus}x}Co{sub x}(PO{sub 4}){sub 2}, with x = 0.4--1.6, were formed at temperatures up to 950 C; all exhibited the structure of {gamma}-Zn{sub 3}(PO{sub 4}){sub 2}. Solid solutions of orthophosphates of composition Zn{sub 3{minus}x}Cu{sub x}(PO{sub 4}){sub 2} exhibited more-complex behavior. At 1,000 C and copper contents of 20--80 mol%, a phase that is related to Cu{sub 3}(PO{sub 4}){sub 2}, termed here the {var_epsilon}-phase, predominated. At 850--950 C and in the region from 20 mol% to {approximately} 33 mol% of copper, the solid solutions (the {eta}-phase) adopted the structure of graftonite. At 800--900 and 10--15 mol% of copper, the solid solutions exhibited a new structure (the {delta}-phase), which the authors found to be related to the mineral sarcopside. At temperatures {ge} 950 C, the solutions that contained 5--15 mol% of copper (the {beta}-phase) had the structure of {beta}-Zn{sub 3}(PO{sub 4}){sub 2}, whereas at 800--850 C, solutions with 5 mol% of copper (the {gamma}-phase) exhibited the structure of {gamma}-Zn{sub 3}(PO{sub 4}){sub 2}. Attempts to synthesize Cu{sup +}ZnPO{sub 4} and Cu{sup +}Cu{sup 2+}Zn{sub 3}(PO{sub 4}){sub 3} were unsuccessful.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 616223
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 81; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT PHOSPHATES
CRYSTAL STRUCTURE
SOLID SOLUTIONS
SYNTHESIS
ZINC PHOSPHATES