Defect structure and its nomenclature for mixed conducting lanthanum tungstates La_28-xW_4+xO_54+3x/2

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• 作者：Skjalg Erdal ^{skjalg.erdal@smn.uio.no} ; Liv-Elisif Kalland ; Ragnhild Hancke ; Jonathan Polfus ; Reidar Haugsrud ; Truls Norby ; ^{truls.norby@kjemi.uio.no} ; Anna Magras&oacute
• 关键词：Lanthanum tungstate ; Defect structure ; Inherent disorder ; Partial occupancy ; Mixed conductor
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May, 2012
• 卷：37
• 期：9
• 页码：8051-8055
• 文件大小：564 K

摘要

Based on results from experimental and theoretical studies of the crystal structure of lanthanum tungstate , we present a defect model comprising an inherently disordered and partially occupied oxide ion sublattice, which rationalizes hydration and ionic conduction of the materials in the undoped state. Applying the model to experimental conductivity data enables extraction of defect thermodynamics and transport parameters of protons, oxide ions and electronic defects. The standard enthalpy and entropy changes of the hydration of inherent oxygen vacancies are estimated to be聽鈭?3聽kJ/mol and 鈭?25聽J/mol聽K (per聽mole of H₂O), respectively.