TY - JOUR
T1 - Thermodynamic relations among olivine, spinel, and phenacite structures in silicates and germanates
T2 - II. The systems NiOZnOGeO2 and CoOZnOGeO2
AU - Navrotsky, A.
N1 - Funding Information:
This work was supportedb y the ResearchC orporation and by the National Science Foundation (Grant GP 20402).I thank the Sylvania Corporation for its gift of germaniumd ioxide.
PY - 1973/1
Y1 - 1973/1
N2 - Activity-composition relations along the orthogermanate joins of the systems NiOZnOGeO2 and CoOZnOGeO2 at 1050°C have been determined from the phase diagrams and the location of conjugation lines between oxide and orthogermanate phases. In each system, a second distinct spinel phase near XZn2GeO4 = 0.5 is observed in addition to the terminal spinel and phenacite solid solution. The free energies of transformation from the spinel to the phenacite structure are estimated to be +23, +12.7, and -12.6 kcal/mole for Ni2GeO4, Co2GeO4, and Zn2GeO4, respectively.
AB - Activity-composition relations along the orthogermanate joins of the systems NiOZnOGeO2 and CoOZnOGeO2 at 1050°C have been determined from the phase diagrams and the location of conjugation lines between oxide and orthogermanate phases. In each system, a second distinct spinel phase near XZn2GeO4 = 0.5 is observed in addition to the terminal spinel and phenacite solid solution. The free energies of transformation from the spinel to the phenacite structure are estimated to be +23, +12.7, and -12.6 kcal/mole for Ni2GeO4, Co2GeO4, and Zn2GeO4, respectively.
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U2 - 10.1016/0022-4596(73)90202-8
DO - 10.1016/0022-4596(73)90202-8
M3 - Article
AN - SCOPUS:21544465252
SN - 0022-4596
VL - 6
SP - 42
EP - 47
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 1
ER -