TY - JOUR
T1 - Compounds and solid solutions of cobalt, copper phosphates
AU - Bamberger, Carlos E.
AU - Specht, Eliot D.
AU - Anovitz, Lawrence M.
PY - 1998/11
Y1 - 1998/11
N2 - 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 Co2P2O7 and Cu2P2O7, the orthophosphates Co3(PO4)2 and Cu3(PO4)2, and Co3(PO4)2 and Cu2P2O7. 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 Co3(PO4)2 to Co2Cu(PO4)2. At Co1.5Cu1.5(PO4)2, a new structure (L) occurs. At 950°C, CoCu2(PO4)2 also exhibits this structure, which is similar to that of graftonite, Fe3(PO4)2. CoCu2(PO4)2 is dimorphic, changing reversibly at 1000°C to a triclinic structure (H) related to that of Cu3(PO4)2. From CoCu2(PO4)2 (H) to Cu3(PO4)2, the structure appears to vary gradually. A new phosphate, Cu+Cu2+Co3(PO4)3, has also been synthesized.
AB - 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 Co2P2O7 and Cu2P2O7, the orthophosphates Co3(PO4)2 and Cu3(PO4)2, and Co3(PO4)2 and Cu2P2O7. 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 Co3(PO4)2 to Co2Cu(PO4)2. At Co1.5Cu1.5(PO4)2, a new structure (L) occurs. At 950°C, CoCu2(PO4)2 also exhibits this structure, which is similar to that of graftonite, Fe3(PO4)2. CoCu2(PO4)2 is dimorphic, changing reversibly at 1000°C to a triclinic structure (H) related to that of Cu3(PO4)2. From CoCu2(PO4)2 (H) to Cu3(PO4)2, the structure appears to vary gradually. A new phosphate, Cu+Cu2+Co3(PO4)3, has also been synthesized.
UR - http://www.scopus.com/inward/record.url?scp=0032208135&partnerID=8YFLogxK
U2 - 10.1111/j.1151-2916.1998.tb02699.x
DO - 10.1111/j.1151-2916.1998.tb02699.x
M3 - Article
AN - SCOPUS:0032208135
SN - 0002-7820
VL - 81
SP - 2799
EP - 2804
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 11
ER -