Studies on oxygen dissociation pressure of LnMnO3 (Ln = rare earth) with the e.m.f. technique
Studies on oxygen dissociation pressure of LnMnO3 (Ln = rare earth) with the e.m.f. technique
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LnMnO3（Ln = 稀土）的氧解离压与电动势的研究
DOI：
10.1016/0925-8388(96)02253-0
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
N. Kamegashira
中科院分区：
文献类型：
--
作者：
T. Atsumi;T. Ohgushi;N. Kamegashira
采用稳定的zro2作为固体电解质，用电动势测量了LnMnO3（LnLa、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Y或Sc）在高温（1170 ~ 1400 K）下的氧解离压力。假设分解反应以化学计量形式进行，由氧解离压力确定分解反应的标准吉布斯自由能变化。研究了自由能随Ln恒等变化的变化规律。结果表明，晶体结构和Ln3+的离子半径对能量的变化有很大的影响。由分解反应的标准吉布斯自由能变化和分解物质的标准吉布斯自由能变化得到了lnmno3化合物的标准吉布斯自由能变化。
The oxygen dissociation pressure of LnMnO3(Ln La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y or Sc) was measured at high temperature (1170–1400 K) by means of e.m.f. using stabilized ZrO2as a solid electrolyte. Assuming that the decomposition reaction proceeds in a stoichiometric form, a standard Gibbs free energy change of decomposition was determined from the oxygen dissociation pressure. The variation of the free energy change with change in identity of Ln was investigated. It was found that the energy change depends strongly upon both the crystal structure and the ionic radius of Ln3+. The standard Gibbs free energy change of formation for LnMnO3compounds was obtained from the standard Gibbs free energy change for the decomposition reactions and those for the formation of the decomposition materials.