TY - JOUR
T1 - Enthalpies of formation of LaBO3 perovskites (B = Al, Ga, Sc, and In)
AU - Cheng, Jihong
AU - Navrotsky, Alexandra
N1 - Funding Information:
The authors thank S. Roeske for the help with the electron microprobe analysis. We are grateful to K. Helean for doing part of the lanthanum oxide drop solution experiments. This project was supported by the United States Department of Energy (DOE) (Grant No. DE-FG02-03ER46053).
PY - 2003/10
Y1 - 2003/10
N2 - Enthalpies of formation from constituent oxides and elements at 298 K were determined by high-temperature oxide melt solution calorimetry for a group of technologically important perovskites LaBO3 (B = La, Ga, Sc, and In). Enthalpies of formation from oxides of LaAlO3 and LaGaO3 are -69.61 ± 3.23 kJ/mol and -52.39 ± 1.99 kJ/mol, respectively. The data were consistent with literature values obtained using other methods. The enthalpies of formation of LaScO3 and LaInO3 from oxides were reported for the first time as -38.64 ± 2.30 kJ/mol and -23.99 ± 2.31 kJ/mol, respectively. As seen for other perovskites, as the tolerance factor deviates more from unity (in the order Al, Ga, Sc, In), the enthalpy of formation from oxides becomes less exothermic, indicating a less stable structure with respect to the constituent oxides.
AB - Enthalpies of formation from constituent oxides and elements at 298 K were determined by high-temperature oxide melt solution calorimetry for a group of technologically important perovskites LaBO3 (B = La, Ga, Sc, and In). Enthalpies of formation from oxides of LaAlO3 and LaGaO3 are -69.61 ± 3.23 kJ/mol and -52.39 ± 1.99 kJ/mol, respectively. The data were consistent with literature values obtained using other methods. The enthalpies of formation of LaScO3 and LaInO3 from oxides were reported for the first time as -38.64 ± 2.30 kJ/mol and -23.99 ± 2.31 kJ/mol, respectively. As seen for other perovskites, as the tolerance factor deviates more from unity (in the order Al, Ga, Sc, In), the enthalpy of formation from oxides becomes less exothermic, indicating a less stable structure with respect to the constituent oxides.
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U2 - 10.1557/JMR.2003.0348
DO - 10.1557/JMR.2003.0348
M3 - Article
AN - SCOPUS:0242408400
SN - 0884-2914
VL - 18
SP - 2501
EP - 2508
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 10
ER -