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Title: Effect of iron substitution on the structural, electric, and magnetic properties in R-type PbFe{sub x}V{sub 6-x}O{sub 11}, a frustrated system

Abstract

Single-phase material of the solid solution PbFe{sub x}V{sub 6-x}O{sub 11} was prepared by solid-state reaction over the range 1 {le} x {le} 1.75. Powder preparations of PbV{sub 6}O{sub 11}, however, were always accompanied by a small amount of impurity. The noncentrosymmetric space group P6{sub 3}mc of PbV{sub 6}O{sub 11}, which has an R-block structure, remains unchanged with iron substitution. The crystal structure, remains unchanged with iron substitution. The crystal structure of PbFe{sub 1.75}V{sub 4.25}O{sub 11} was refined from single-crystal X-ray data to R = 0.049. The iron atoms are located preferentially in specific crystallographic sites. The triangular-bipyramidal site is completely occupied by Fe{sup 3+} while the interstices of the central octahedral layer are solely occupied by the vanadium V(1) atoms. The other two crystallographic sites have mixed Fe/V occupancies. Magnetic measurements performed on nearly single-phase PbV{sub 6}O{sub 11} and the iron substituted phases reveal a spin-glass-type behavior with freezing temperatures T{sub f} of 50 and 65 K, respectively. T{sub f} is independent of the iron ratio. This spin-disordered system is attributed to strong frustration occurring in the a-b plane because of the existence of V(1) trimers providing alternatively long and short V-V distances along the a axis. Resistance and Seebeckmore » coefficient measurements indicate p-type conduction above T{sub f} while the system becomes an insulator below T{sub f}. Fe{sup 3+} ions do not participate in the hopping process, and they block conduction parallel to the c axis because of their location in the bridging dimeric octahedral and bipyramidal sites.« less

Authors:
; ;  [1];  [2]
  1. Universite des Sciences et Technologies de Lille, Villeneuve (France)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
OSTI Identifier:
577475
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 130; Journal Issue: 2; Other Information: PBD: May 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LEAD OXIDES; VANADIUM OXIDES; IRON OXIDES; CRYSTAL STRUCTURE; FREEZING; GLASS; MAGNETIC PROPERTIES; ELECTRICAL PROPERTIES; VALENCE; PHASE TRANSFORMATIONS

Citation Formats

Mentre, O, Dhaussy, A C, Abraham, F, and Steinfink, H. Effect of iron substitution on the structural, electric, and magnetic properties in R-type PbFe{sub x}V{sub 6-x}O{sub 11}, a frustrated system. United States: N. p., 1997. Web. doi:10.1006/jssc.1997.7294.
Mentre, O, Dhaussy, A C, Abraham, F, & Steinfink, H. Effect of iron substitution on the structural, electric, and magnetic properties in R-type PbFe{sub x}V{sub 6-x}O{sub 11}, a frustrated system. United States. https://doi.org/10.1006/jssc.1997.7294
Mentre, O, Dhaussy, A C, Abraham, F, and Steinfink, H. 1997. "Effect of iron substitution on the structural, electric, and magnetic properties in R-type PbFe{sub x}V{sub 6-x}O{sub 11}, a frustrated system". United States. https://doi.org/10.1006/jssc.1997.7294.
@article{osti_577475,
title = {Effect of iron substitution on the structural, electric, and magnetic properties in R-type PbFe{sub x}V{sub 6-x}O{sub 11}, a frustrated system},
author = {Mentre, O and Dhaussy, A C and Abraham, F and Steinfink, H},
abstractNote = {Single-phase material of the solid solution PbFe{sub x}V{sub 6-x}O{sub 11} was prepared by solid-state reaction over the range 1 {le} x {le} 1.75. Powder preparations of PbV{sub 6}O{sub 11}, however, were always accompanied by a small amount of impurity. The noncentrosymmetric space group P6{sub 3}mc of PbV{sub 6}O{sub 11}, which has an R-block structure, remains unchanged with iron substitution. The crystal structure, remains unchanged with iron substitution. The crystal structure of PbFe{sub 1.75}V{sub 4.25}O{sub 11} was refined from single-crystal X-ray data to R = 0.049. The iron atoms are located preferentially in specific crystallographic sites. The triangular-bipyramidal site is completely occupied by Fe{sup 3+} while the interstices of the central octahedral layer are solely occupied by the vanadium V(1) atoms. The other two crystallographic sites have mixed Fe/V occupancies. Magnetic measurements performed on nearly single-phase PbV{sub 6}O{sub 11} and the iron substituted phases reveal a spin-glass-type behavior with freezing temperatures T{sub f} of 50 and 65 K, respectively. T{sub f} is independent of the iron ratio. This spin-disordered system is attributed to strong frustration occurring in the a-b plane because of the existence of V(1) trimers providing alternatively long and short V-V distances along the a axis. Resistance and Seebeck coefficient measurements indicate p-type conduction above T{sub f} while the system becomes an insulator below T{sub f}. Fe{sup 3+} ions do not participate in the hopping process, and they block conduction parallel to the c axis because of their location in the bridging dimeric octahedral and bipyramidal sites.},
doi = {10.1006/jssc.1997.7294},
url = {https://www.osti.gov/biblio/577475}, journal = {Journal of Solid State Chemistry},
number = 2,
volume = 130,
place = {United States},
year = {Thu May 01 00:00:00 EDT 1997},
month = {Thu May 01 00:00:00 EDT 1997}
}