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  Anomalous Thermal Expansion of HoCo0.5Cr0.5O3 Probed by X-ray Synchrotron Powder Diffraction

Hreb, V., Vasylechko, L., Mykhalichko, V., & Prots, Y. (2017). Anomalous Thermal Expansion of HoCo0.5Cr0.5O3 Probed by X-ray Synchrotron Powder Diffraction. Nanoscale Research Letters, 12: 442, pp. 1-6. doi:10.1186/s11671-017-2213-7.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-AF06-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-AF08-1
Genre: Journal Article

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Hreb, Vasyl1, Author
Vasylechko, Leonid1, Author
Mykhalichko, Vitaliya1, Author
Prots, Yurii2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              

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 Abstract: Mixed holmium cobaltite-chromite HoCo0.5Cr0.5O3 with orthorhombic perovskite structure (structure type GdFeO3, space group Pbnm) was obtained by solid state reaction of corresponding oxides in air at 1373 K. Room-and high-temperature structural parameters were derived from high-resolution X-ray synchrotron powder diffraction data collected in situ in the temperature range of 300-1140 K. Analysis of the results obtained revealed anomalous thermal expansion of HoCo0.5Cr0.5O3, which is reflected in a sigmoidal temperature dependence of the unit cell parameters and in abnormal increase of the thermal expansion coefficients with a broad maxima near 900 K. Pronounced anomalies are also observed for interatomic distances and angles within Co/CrO6 octahedra, tilt angles of octahedra and atomic displacement parameters. The observed anomalies are associated with the changes of spin state of Co3+ ions and insulator-metal transition occurring in HoCo0.5Cr0.5O3.

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Language(s): eng - English
 Dates: 2017-07-052017-07-05
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000404814800004
DOI: 10.1186/s11671-017-2213-7
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Title: Nanoscale Research Letters
Source Genre: Journal
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Publ. Info: Seacaucus, NJ : Springer Verlag New York
Pages: - Volume / Issue: 12 Sequence Number: 442 Start / End Page: 1 - 6 Identifier: ISSN: 1931-7573
CoNE: /journals/resource/1000000000224290