Oxide ion and electron transport properties in lanthanum silicate oxyapatite ceramics

被引：12

作者：

Mineshige, Atsushi ^{[1
]}

Mieda, Hiroyuki ^{[1
]}

Manabe, Mitsuaki ^{[1
]}

Funahashi, Takahiro ^{[1
]}

Daiko, Yusuke ^{[1
]}

Yazawa, Tetsuo ^{[1
]}

Nishi, Mina ^{[2
]}

Yamaji, Katsuhiko ^{[2
]}

Horita, Teruhisa ^{[2
]}

Amezawa, Koji ^{[3
]}

Yashiro, Keiji ^{[4
]}

Kawada, Tatsuya ^{[4
]}

Yoshioka, Hideki ^{[5
]}

机构：

[1] Univ Hyogo, Grad Sch Engn, Dept Mat Sci & Chem, Himeji, Hyogo 6712201, Japan

[2] Natl Inst Adv Ind Sci & Technol, Fuel Cell Mat Grp, Tsukuba, Ibaraki 3058565, Japan

[3] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

[4] Tohoku Univ, Grad Sch Environm Studies, Aoba Ku, Sendai, Miyagi 9808579, Japan

[5] Hyogo Prefectural Inst Technol, Suma Ku, Kobe, Hyogo 6540037, Japan

来源：

SOLID STATE IONICS | 2014年 / 262卷

关键词：

Apatite; Oxyapatite; Lanthanum silicate; Solid electrolyte; Solid oxide fuel cell; Diffusion coefficient; DIFFUSION PATH; SINGLE-CRYSTAL; CONDUCTIVITY; LN=LA; GD; SM; DY; ND;

D O I：

10.1016/j.ssi.2014.04.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An oxygen-excess-type lanthanum silicate (LSO) solid electrolyte with high chemical stability as well as high ion conductivity was developed by optimizing the chemical composition, La-9.333 (+ x)(Si-6 - yAl(y))O-26 (+ 1.5x) (- 0.5y). It was found that La-10(Si5.8Al0.2)O-26.9 (x = 0.667, y = 0.2) exhibited the highest conductivity among them, and addition of a small amount of iron was effective for the improvement of its chemical stability. The LSO specimen of x = 0.667 and y = 0.2 with iron addition (0.5 mol%) was chemically stable and had a conductivity of 5.6 x 10(-2) S cm(-1) under air at 1073 K, while its electronic conductivity was less than 2.0 x 10(-4) S cm(-1) at the same temperature. The oxygen tracer diffusion coefficient, D-o* of this material was determined as 2.0 x 10(-8) cm(2) s(-1) at 1073 K. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：555 / 558

页数：4

共 21 条

[1] A novel enhancement of ionic conductivity in the cation-deficient apatite La9.33(SiO4)6O2 [J].