HIGH-PRESSURE SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF THE DEFICIENT PEROVSKITE BA0.88NBO2.3

被引：4

作者：

ALONSO, JA

CASAIS, MT

MARTINEZLOPE, MJ

机构：

[1] Instituto de Ciencia de Materiales de Madrid, C.S.I.C., 28006 Madrid

来源：

MATERIALS RESEARCH BULLETIN | 1995年 / 30卷 / 02期

关键词：

DEFECT PEROVSKITE; MIXED-VALENCE NB OXIDE; HIGH PRESSURE SYNTHESIS;

D O I：

10.1016/0025-5408(94)00126-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The title compound has been prepared from BaO, NbO2, and Nb mixtures, at 1200-degrees-C under an hydrostatic pressure of 12 kbar. It is cubic, a = 4.3239(4) angstrom, and the Rietveld analysis of the X-ray diffraction profile shows a strong deficiency in both Ba and oxygen positions. Unlike metallic BaNbO3, this defect perovskite shows insulating behavior, the oxygen vacancies hindering the electronic delocalization along the structure.

引用

页码：251 / 256

页数：6

共 17 条

[1]

ALARIOFRANCO MA, 1977, NATURE, V270, P706

[2] REFINEMENT OF CRYSTAL-STRUCTURE OF DICALCIUM FERRITE, CA2FE2O5 [J].

BERGGREN, J .

ACTA CHEMICA SCANDINAVICA, 1971, 25 (10) :3616-&

[3] CRYSTAL STRUCTURE OF NIOBIUM MONOXIDE [J].

BOWMAN, AL ;

WALLACE, TC ;

YARNELL, JL ;

WENZEL, RG .

ACTA CRYSTALLOGRAPHICA, 1966, 21 :843-&

[4]

CASAIS MT, IN PRESS MATER RES B

[5] REDUCED FORMS OF LANIO3 PEROVSKITE .1. EVIDENCE FOR NEW PHASES - LA2NI2O5 AND LANIO2 [J].

CRESPIN, M ;

LEVITZ, P ;

GATINEAU, L .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1983, 79 :1181-1194

[6]

DEMARINIS G, 1988, CINEFORUM, V28, P21

[7] CRYSTALLIZATION OF REDUCED STRONTIUM AND BARIUM NIOBATE PEROVSKITES FROM BORATE FLUXES [J].

HESSEN, B ;

SUNSHINE, SA ;

SIEGRIST, T ;

JIMENEZ, R .

MATERIALS RESEARCH BULLETIN, 1991, 26 (01) :85-90

[8]

Kreiser R.R., 1970, J SOLID STATE CHEM, V1, P368, DOI [10.1016/0022-4596(70)90117-9, DOI 10.1016/0022-4596(70)90117-9]

[9]

KRYLOV EI, 1955, DOKL AKAD NAUK SSSR+, V104, P246

[10] OXOMETALLATES WITH PLANAR COORDINATION [J].

MULLERBUSCHBAUM, H .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1977, 16 (10) :674-687

← 1 2 →