DETERMINATION OF THE LOCAL-STRUCTURE IN BA1-XKXBIO3 BY X-RAY-ABSORPTION SPECTROSCOPY

被引：76

作者：

SALEMSUGUI, S ^{[1
]}

ALP, EE ^{[1
]}

MINI, SM ^{[1
]}

RAMANATHAN, M ^{[1
]}

CAMPUZANO, JC ^{[1
]}

JENNINGS, G ^{[1
]}

FAIZ, M ^{[1
]}

PEI, S ^{[1
]}

DABROWSKI, B ^{[1
]}

ZHENG, Y ^{[1
]}

RICHARDS, DR ^{[1
]}

HINKS, DG ^{[1
]}

机构：

[1] UNIV ILLINOIS,CHICAGO,IL 60680

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.43.5511

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The local structure around Bi atoms has been studied in Ba(1-x)K(x)BiO3 (0.0 < x < 0.4) via x-ray-absorption spectroscopy. The structure is determined in terms of coordination numbers and interatomic distances around the Bi atoms between 300 and 13 K from Bi L3 extended x-ray-absorption fine-structure data. The charges on Bi and O have been measured as a function of K doping using Bi L3, and O K-edge x-ray-absorption near-edge-structure spectroscopy. It was found that the ordered breathing-mode-type distortion in BaBiO3 is replaced by a disordered distortion of the same type when K is substituted into the Ba site, which persists down to 13 K for x = 0.2 and disappears for the x = 0.4 composition. The overall Bi valence increases only slightly whereas O 2p orbitals are doped with holes with increasing K content. As the insulator-metal boundary is crossed for x = 0.35 these holes become delocalized, and contribute to the metallic behavior of the Ba0.6K0.4BiO3 compound.

引用

页码：5511 / 5515

页数：5

共 18 条

[1]

ALP EE, UNPUB

[2] HIGH-TC SUPERCONDUCTIVITY IN BISMUTHATES - HOW MANY ROADS LEAD TO HIGH-TC [J].