TY - JOUR
T1 - Energetics of La2-xSrxCuO4-y solid solutions (0.0 ≤ x ≤ 1.0)
AU - Bularzik, Joseph
AU - Navrotsky, Alexandra
AU - DiCarlo, Joseph
AU - Bringley, Joseph
AU - Scott, Bruce
AU - Trail, Steven
N1 - Funding Information:
This work was a joint researchp roject betweenN a-vrotsky’s group at Princeton and Scott’s group at I.B.M. J. Bularzik was supported by a grant from I.B.M., while J. DiCarlo, A. Navrotsky, and calorimetry lab operationsr eceived support from a grant from the Department of Energy (Grant DE-FGOZ 89ER45394).
PY - 1991/8
Y1 - 1991/8
N2 - Compounds in the La2-xSrxCuO4-y series have been synthesized in the single phase range 0 ≤ x ≤ 1. High temperature solution calorimetry in molten lead borate was used to determine the heats of formation from oxide components. The enthalpy of formation becomes more exothermic with increasing Sr substitution 0 ≤ x ≤ 0.15 and then remains approximately constant for 0.15 ≤ x ≤ 1. This trend can be explained by the balance between the (formal) substitution La3+ + Cu2+ = Sr2+ + Cu3+ and the loss of oxygen, keeping copper formally divalent but creating oxygen vacancies. Using a transposed temperature drop method, the heat of oxidation was determined to be -129 kJ/(mole O2) by a comparison of samples with the same strontium content but a different oxygen content.
AB - Compounds in the La2-xSrxCuO4-y series have been synthesized in the single phase range 0 ≤ x ≤ 1. High temperature solution calorimetry in molten lead borate was used to determine the heats of formation from oxide components. The enthalpy of formation becomes more exothermic with increasing Sr substitution 0 ≤ x ≤ 0.15 and then remains approximately constant for 0.15 ≤ x ≤ 1. This trend can be explained by the balance between the (formal) substitution La3+ + Cu2+ = Sr2+ + Cu3+ and the loss of oxygen, keeping copper formally divalent but creating oxygen vacancies. Using a transposed temperature drop method, the heat of oxidation was determined to be -129 kJ/(mole O2) by a comparison of samples with the same strontium content but a different oxygen content.
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U2 - 10.1016/0022-4596(91)90315-9
DO - 10.1016/0022-4596(91)90315-9
M3 - Article
AN - SCOPUS:0000964279
SN - 0022-4596
VL - 93
SP - 418
EP - 429
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 2
ER -