DISORDER IN BETA''-ALUMINAS - DIELECTRIC-RELAXATION AND X-RAY ABSORPTION

被引：4

作者：

DENBOER, ML

PAK, YS

ADAMIC, KJ

GREENBAUM, SG

WINTERSGILL, MC

LOMAX, JF

FONTANELLA, JJ

DUNN, B

FARRINGTON, GC

机构：

[1] USN ACAD, DEPT PHYS, ANNAPOLIS, MD 21402 USA

[2] USN ACAD, DEPT CHEM, ANNAPOLIS, MD 21402 USA

[3] UNIV CALIF LOS ANGELES, DEPT MAT SCI & ENGN, LOS ANGELES, CA 90024 USA

[4] UNIV PENN, DEPT MAT SCI & ENGN, PHILADELPHIA, PA 19104 USA

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.45.6369

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Beta"-aluminas substituted with rare-earth elements (Pr, Nd, Er, and Tb) and Sn have been studied using near-edge and extended x-ray-absorption fine structure (NEXAFS and EXAFS). In addition, dielectric-relaxation (DR) measurements have been made on Na-beta-, Na-beta"-, and Na-Er-beta"-alumina. Both the DR and EXAFS results confirm that disorder, particularly in the conduction plane, in the vicinity of the rare-earth ions is a key feature of the beta"-aluminas. The NEXAFS studies show that the rare-earth ions are ionized to trivalency and are highly localized; in contrast, Sn is clearly divalent, as in SnO.

引用

页码：6369 / 6375

页数：7

共 16 条

[1] CLUSTER-ASSOCIATED RELAXATIONS IN RARE-EARTH-DOPED CALCIUM-FLUORIDE [J].