Phase segregation in the Gd1-xSrxFeO3-δ series

被引：39

作者：

Blasco, J ^{[1
]}

Stankiewicz, J ^{[1
]}

García, J ^{[1
]}

机构：

[1] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2006年 / 179卷 / 03期

关键词：

ferrites; metal-insulator transition; miscibility gap; perovskites; Anderson transition; antiferromagnetism; mixed oxides;

D O I：

10.1016/j.jssc.2005.12.023

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Gd1-xSrxFeO3-delta ferrites have been studied by means of X-ray powder diffraction in the whole composition range. Single-phase solid solution is found for x < 0.09 and for x > 0.63. At intermediate Sr content, phase segregation takes place. Compounds with x <= 0.05 crystallize in the orthorhombic structure, space group Pbnm. Oxygen-deficient Gd1-xSrxFeO3-delta with x >= 2/3 are cubic or nearly cubic. The oxygen vacancies stabilize the cubic phase for x = 2/3 whereas highly oxidized samples show an orthorhombic distortion, which has not been observed earlier. Magnetic and electrical properties have been measured for the single-phase solid solutions. Gd1-xSrxFeO3-delta compounds with x >= 2/3 order antiferromagnetically below similar to 100 K. In the paramagnetic region, their susceptibility follows the Curie-Weiss law in all but SrFeO2.96 compound. These ferrites show semiconducting behavior in the electrical transport likely related to atomic disorder. We find that the conductivity activation energy becomes larger by increasing either the Gd content or the oxygen vacancies. (C) 2005 Elsevier Inc. All rights reserved.

引用

页码：898 / 908

页数：11

共 40 条

[1] CONTROLLED-VALENCE PROPERTIES OF LA1-XSRXFEO3 AND LA1-XSRXMNO3 STUDIED BY SOFT-X-RAY ABSORPTION-SPECTROSCOPY
ABBATE, M
DEGROOT, FMF
FUGGLE, JC
FUJIMORI, A
STREBEL, O
LOPEZ, F
DOMKE, M
KAINDL, G
SAWATZKY, GA
TAKANO, M
TAKEDA, Y
EISAKI, H
UCHIDA, S
[J]. PHYSICAL REVIEW B, 1992, 46 (08): : 4511 - 4519
[2] Charge-ordered state in single-crystalline CaFeO3 thin film studied by x-ray anomalous diffraction -: art. no. 156405
Akao, T
Azuma, Y
Usuda, M
Nishihata, Y
Mizuki, J
Hamada, N
Hayashi, N
Terashima, T
Takano, M
[J]. PHYSICAL REVIEW LETTERS, 2003, 91 (15)
[3] MICRODOMAIN TEXTURE AND OXYGEN EXCESS IN THE CALCIUM-LANTHANUM FERRITE - CA2LAFE3O8
ALARIOFRANCO, MA
HENCHE, MJR
VALLET, M
CALBET, JMG
GRENIER, JC
WATTIAUX, A
HAGENMULLER, P
[J]. JOURNAL OF SOLID STATE CHEMISTRY, 1983, 46 (01) : 23 - 40
[4] POLARONS IN CRYSTALLINE AND NON-CRYSTALLINE MATERIALS
AUSTIN, IG
MOTT, NF
[J]. ADVANCES IN PHYSICS, 1969, 18 (71) : 41 - +
[5] High-temperature ion transport in La1-xSrxFeO3-δ
Bahteeva, JA
Leonidov, IA
Patrakeev, MV
Mitberg, EB
Kozhevnikov, VL
Poeppelmeier, KR
[J]. JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 2004, 8 (09) : 578 - 584
[6] THE STRUCTURAL CONSEQUENCES OF CHARGE DISPROPORTIONATION IN MIXED-VALENCE IRON-OXIDES .1. THE CRYSTAL-STRUCTURE OF SR2LAFE3O8.94 AT ROOM-TEMPERATURE AND 50-K
BATTLE, PD
GIBB, TC
LIGHTFOOT, P
[J]. JOURNAL OF SOLID STATE CHEMISTRY, 1990, 84 (02) : 271 - 279
[7] BOGOLOMOV VN, 1988, SOV PHYS-SOLID STATE, V9, P2502
[8] Structure and magnetism of Pr1-xSrxFeO3-δ
Brinks, HW
Fjellvåg, H
Kjekshus, A
Hauback, BC
[J]. JOURNAL OF SOLID STATE CHEMISTRY, 2000, 150 (02) : 233 - 249
[9] The manganite Nd0.5Sr0.5MnO3: A rare distortion of the perovskite
Caignaert, V
Millange, F
Hervieu, M
Suard, E
Raveau, B
[J]. SOLID STATE COMMUNICATIONS, 1996, 99 (03) : 173 - 177
[10] THE EFFECT OF OXYGEN STOICHIOMETRY ON PHASE-RELATIONS AND STRUCTURE IN THE SYSTEM LA1-XSRXFEO3-DELTA (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1, 0-LESS-THAN-OR-EQUAL-TO-DELTA-LESS-THAN-OR-EQUAL-TO-0.5)
DANN, SE
CURRIE, DB
WELLER, MT
THOMAS, MF
ALRAWWAS, AD
[J]. JOURNAL OF SOLID STATE CHEMISTRY, 1994, 109 (01) : 134 - 144

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