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Title: Oxygen miscibility gap and spin glass formation in the pyrochlore Lu{sub 2}Mo{sub 2}O{sub 7}

Abstract

Rare earth (R) molybdate pyrochlores, R{sub 2}Mo{sub 2}O{sub 7}, are of interest as frustrated magnets. Polycrystalline samples of Lu{sub 2}Mo{sub 2}O{sub 7−x} prepared at 1600 °C display a coexistence of cubic pyrochlore phases. Rietveld fits to powder neutron diffraction data and chemical analyses show that the miscibility gap is between a stoichiometric x=0 and an oxygen-deficient x≈0.4 phase. Lu{sub 2}Mo{sub 2}O{sub 7} behaves as a spin glass material, with a divergence of field cooled and zero field cooled DC magnetic susceptibilities at a spin freezing temperature T{sub f}=16 K, that varies with frequency in AC measurements following a Vogel–Fulcher law. Lu{sub 2}Mo{sub 2}O{sub 6.6} is more highly frustrated spin glass and has T{sub f}=20 K. - Graphical abstract: The cubic Lu{sub 2}Mo{sub 2}O{sub 7−x} system exhibits a miscibility gap between coexisting pyrochlore phases at 1600 °C. Neutron powder diffraction refinement and chemical analysis shows that the gap separates stoichiometric x=0 and oxygen-deficient x≈0.4 phases. Lu{sub 2}Mo{sub 2}O{sub 7−x} has a frustrated spin glass ground state that is sensitive to the oxygen content. - Highlights: • The cubic Lu{sub 2}Mo{sub 2}O{sub 7−x} system has a miscibility gap between coexisting pyrochlore phases at 1600 °C. • Neutron powder diffraction shows that themore » gap separates x=0 and oxygen-deficient x≈0.4 phases. • Lu{sub 2}Mo{sub 2}O{sub 7−x} has a frustrated spin glass ground state that is sensitive to the oxygen content.« less

Authors:
 [1];  [2];  [1]
  1. Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ (United Kingdom)
  2. Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9 (France)
Publication Date:
OSTI Identifier:
22309037
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 203; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CHEMICAL ANALYSIS; FREEZING; GROUND STATES; MAGNETIC SUSCEPTIBILITY; MAGNETS; MOLYBDATES; NEUTRON DIFFRACTION; OXIDES; OXYGEN; POLYCRYSTALS; PYROCHLORE; RARE EARTHS; SOLUBILITY; SPIN; SPIN GLASS STATE

Citation Formats

Clark, L., Ritter, C., Harrison, A., Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, and Attfield, J.P., E-mail: j.p.attfield@ed.ac.uk. Oxygen miscibility gap and spin glass formation in the pyrochlore Lu{sub 2}Mo{sub 2}O{sub 7}. United States: N. p., 2013. Web. doi:10.1016/J.JSSC.2013.04.012.
Clark, L., Ritter, C., Harrison, A., Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, & Attfield, J.P., E-mail: j.p.attfield@ed.ac.uk. Oxygen miscibility gap and spin glass formation in the pyrochlore Lu{sub 2}Mo{sub 2}O{sub 7}. United States. doi:10.1016/J.JSSC.2013.04.012.
Clark, L., Ritter, C., Harrison, A., Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, and Attfield, J.P., E-mail: j.p.attfield@ed.ac.uk. Mon . "Oxygen miscibility gap and spin glass formation in the pyrochlore Lu{sub 2}Mo{sub 2}O{sub 7}". United States. doi:10.1016/J.JSSC.2013.04.012.
@article{osti_22309037,
title = {Oxygen miscibility gap and spin glass formation in the pyrochlore Lu{sub 2}Mo{sub 2}O{sub 7}},
author = {Clark, L. and Ritter, C. and Harrison, A. and Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9 and Attfield, J.P., E-mail: j.p.attfield@ed.ac.uk},
abstractNote = {Rare earth (R) molybdate pyrochlores, R{sub 2}Mo{sub 2}O{sub 7}, are of interest as frustrated magnets. Polycrystalline samples of Lu{sub 2}Mo{sub 2}O{sub 7−x} prepared at 1600 °C display a coexistence of cubic pyrochlore phases. Rietveld fits to powder neutron diffraction data and chemical analyses show that the miscibility gap is between a stoichiometric x=0 and an oxygen-deficient x≈0.4 phase. Lu{sub 2}Mo{sub 2}O{sub 7} behaves as a spin glass material, with a divergence of field cooled and zero field cooled DC magnetic susceptibilities at a spin freezing temperature T{sub f}=16 K, that varies with frequency in AC measurements following a Vogel–Fulcher law. Lu{sub 2}Mo{sub 2}O{sub 6.6} is more highly frustrated spin glass and has T{sub f}=20 K. - Graphical abstract: The cubic Lu{sub 2}Mo{sub 2}O{sub 7−x} system exhibits a miscibility gap between coexisting pyrochlore phases at 1600 °C. Neutron powder diffraction refinement and chemical analysis shows that the gap separates stoichiometric x=0 and oxygen-deficient x≈0.4 phases. Lu{sub 2}Mo{sub 2}O{sub 7−x} has a frustrated spin glass ground state that is sensitive to the oxygen content. - Highlights: • The cubic Lu{sub 2}Mo{sub 2}O{sub 7−x} system has a miscibility gap between coexisting pyrochlore phases at 1600 °C. • Neutron powder diffraction shows that the gap separates x=0 and oxygen-deficient x≈0.4 phases. • Lu{sub 2}Mo{sub 2}O{sub 7−x} has a frustrated spin glass ground state that is sensitive to the oxygen content.},
doi = {10.1016/J.JSSC.2013.04.012},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 203,
place = {United States},
year = {2013},
month = {7}
}