TY - GEN
T1 - Thermochemistry of complex perovskites
AU - Navrotsky, Alexandra
N1 - Funding Information:
This work was supported by the National Science Foundation through the Center for High Pressure Research, a Science and Technology Center.
Publisher Copyright:
© 2000 American Institute of Physics.
PY - 2000/9/12
Y1 - 2000/9/12
N2 - High temperature oxide melt solution calorimetry is a versatile technique for studying the energetics of formation, solid solution mixing, phase transition, and order/disorder in complex perovskites. The methodology is described and examples of both present and possible future applications given. The stability of the perovskite structure diminishes as the tolerance factor deviates from unity and increases as the size (and basicity) of the A-site cation increases. High pressure lithium niobate and perovskite structures are formed for a number of silicates, gerrnanates, and titanates. Their energetics become less favorable as the A-site cation radius decreases. Ordered double perovskites are favored at high pressure. Such materials as well as the vacancy-ordered brownmillerite structures are only marginally energetically stable with respect to end-member perovskites. Thermocheniical data suggest that "disordered" perovskite phases in fact contain pervasive clustering and/or short range order.
AB - High temperature oxide melt solution calorimetry is a versatile technique for studying the energetics of formation, solid solution mixing, phase transition, and order/disorder in complex perovskites. The methodology is described and examples of both present and possible future applications given. The stability of the perovskite structure diminishes as the tolerance factor deviates from unity and increases as the size (and basicity) of the A-site cation increases. High pressure lithium niobate and perovskite structures are formed for a number of silicates, gerrnanates, and titanates. Their energetics become less favorable as the A-site cation radius decreases. Ordered double perovskites are favored at high pressure. Such materials as well as the vacancy-ordered brownmillerite structures are only marginally energetically stable with respect to end-member perovskites. Thermocheniical data suggest that "disordered" perovskite phases in fact contain pervasive clustering and/or short range order.
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U2 - 10.1063/1.1324466
DO - 10.1063/1.1324466
M3 - Conference contribution
AN - SCOPUS:85077186952
T3 - AIP Conference Proceedings
SP - 288
EP - 296
BT - Fundamental Physics of Ferroelectrics 2000
A2 - Cohen, Ronald E.
A2 - Mewaldt, Richard A.
PB - American Institute of Physics Inc.
T2 - Aspen Center for Physics Winter Workshop on Fundamental Physics of Ferroelectrics 2000
Y2 - 13 February 2000 through 20 February 2000
ER -