PROBLEM TO BE SOLVED: To provide a solid electrolyte material which can be prevented from undergoing aged deterioration as to ion conductivity even when used for a long time by achieving both high ion conductivity and crystalline structure stability through the resolution of problems with the solid solubility limit of Al2 O3 in a ZrO2 -Sc2 O3 -Al2 O3 type that serves as a conventional solid electrolyte material. SOLUTION: In a ZrO2 (zirconia) type solid electrolyte which contains Sc2 O3 as the main dopant and Al2 O3 as the auxiliary dopant, Yb2 O3 and/or Lu2 O3 are further added as trace amounts of dopants, the compositions of the additions being (1-x)(ZrO2 )-(x-y-z)(Sc2 O3 )-y(Al2 O3 )-z (1-a)(Yb2 O3 )-a(Lu2 O3 )} (0.07=x=0.13, 0.0005=y=0.006, 0.02-4y=z=0.04-4y, 0.0=z, 0=a=1).
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机译：解决的问题：提供一种固体电解质材料，即使通过长时间使用也可以通过解决固溶极限的问题实现高离子导电性和晶体结构稳定性，从而防止离子导电性的老化劣化ZrO 2 -Sc 2 O 3 -Al 2 O 3类型的Al 2 O 3用作常规固体电解质材料。解决方案：在含有Sc2 O3作为主要掺杂剂和Al2 O3作为辅助掺杂剂的ZrO2（氧化锆）型固体电解质中，进一步添加Yb2 O3和/或Lu2 O3作为痕量掺杂剂，添加物的组成为（ 1-x）（ZrO2）-（xyz）（Sc2 O3）-y（Al2 O3）-z（1-a）（Yb2 O3）-a（Lu2 O3）}（0.07 <= x <= 0.13，0.0005 < = y <= 0.006、0.02-4y <= z <= 0.04-4y，0.0 <= z，0 <= a <= 1）。
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