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Title: Phase segregation in the Gd{sub 1-x}Sr{sub x}FeO{sub 3-{delta}} series

Abstract

Gd{sub 1-x}Sr{sub x}FeO{sub 3-{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 Gd{sub 1-x}Sr{sub x}FeO{sub 3-{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. Gd{sub 1-x}Sr{sub x}FeO{sub 3-{delta}} compounds with x>=2/3 order antiferromagnetically below {approx}100K. In the paramagnetic region, their susceptibility follows the Curie-Weiss law in all but SrFeO{sub 2.96} 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.

Authors:
 [1];  [2];  [2]
  1. Departamento de Fisica de la Materia Condensada, Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza (Spain). E-mail: jbc@unizar.es
  2. Departamento de Fisica de la Materia Condensada, Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza (Spain)
Publication Date:
OSTI Identifier:
20784935
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 3; Other Information: DOI: 10.1016/j.jssc.2005.12.023; PII: S0022-4596(05)00605-5; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACTIVATION ENERGY; ANTIFERROMAGNETISM; ELECTRICAL PROPERTIES; FERRITES; GADOLINIUM COMPOUNDS; ORTHORHOMBIC LATTICES; PARAMAGNETISM; PEROVSKITES; SEGREGATION; SOLID SOLUTIONS; SPACE GROUPS; STRONTIUM COMPOUNDS; VACANCIES; X-RAY DIFFRACTION

Citation Formats

Blasco, Javier, Stankiewicz, Jolanta, and Garcia, Joaquin. Phase segregation in the Gd{sub 1-x}Sr{sub x}FeO{sub 3-{delta}} series. United States: N. p., 2006. Web. doi:10.1016/j.jssc.2005.12.023.
Blasco, Javier, Stankiewicz, Jolanta, & Garcia, Joaquin. Phase segregation in the Gd{sub 1-x}Sr{sub x}FeO{sub 3-{delta}} series. United States. doi:10.1016/j.jssc.2005.12.023.
Blasco, Javier, Stankiewicz, Jolanta, and Garcia, Joaquin. Wed . "Phase segregation in the Gd{sub 1-x}Sr{sub x}FeO{sub 3-{delta}} series". United States. doi:10.1016/j.jssc.2005.12.023.
@article{osti_20784935,
title = {Phase segregation in the Gd{sub 1-x}Sr{sub x}FeO{sub 3-{delta}} series},
author = {Blasco, Javier and Stankiewicz, Jolanta and Garcia, Joaquin},
abstractNote = {Gd{sub 1-x}Sr{sub x}FeO{sub 3-{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 Gd{sub 1-x}Sr{sub x}FeO{sub 3-{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. Gd{sub 1-x}Sr{sub x}FeO{sub 3-{delta}} compounds with x>=2/3 order antiferromagnetically below {approx}100K. In the paramagnetic region, their susceptibility follows the Curie-Weiss law in all but SrFeO{sub 2.96} 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.},
doi = {10.1016/j.jssc.2005.12.023},
journal = {Journal of Solid State Chemistry},
number = 3,
volume = 179,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}