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Title: Structural and electronic properties of Sr{sub 1−x}Ca{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}

Abstract

The series of Sr{sub 1−x}Ca{sub x}Ti{sub 1/2}Mn{sub 1/2}O{sub 3} perovskites has been prepared using solid state methods and their structures determined using combination of synchrotron X-ray and powder neutron diffraction. At room temperature the crystal structure evolves with increasing Ca content from Pm3{sup ¯}m→tetragonal I4/mcm→orthorhombic Pbnm, as a consequence of the sequential introduction of cooperative tilting of the (Ti/Mn)O{sub 6} octahedra. X-ray absorption measurements show the Mn is tetravalent in all oxides. Magnetic susceptibility measurements demonstrate all the oxides to be paramagnetic at room temperature, with a transition to a spin glass arrangement occurring at low temperatures. Electrical measurements prove that all the members are semiconductors and their activation energy increase with Ca doping amount. - Graphical abstract: Changes in the bond valence sums for the A- and B-sites in Sr{sub 1−x}Ca{sub x}Mn{sub 0.5}Ti{sub 0.5}O{sub 3} reflect changes in the symmetry of the oxides. - Highlights: • Structures of the Sr{sub 1−x}Ca{sub x}Ti{sub 1/2}Mn{sub 1/2}O{sub 3} perovskites studies using synchrotron X-ray and powder neutron diffraction. • Tilting of the octahedra occurs as Ca content increases. • Changes in the bond valence sums for the A- and B-sites cations reflect changes in the crystal symmetry. • Magnetic properties dependent of Camore » content.« less

Authors:
;  [1]; ; ;  [2]
  1. School of Chemistry, The University of Sydney, Sydney, NSW 2006 (Australia)
  2. Institute of Materials Structure Science, High Energy Accelerator Research Organization KEK, Tsukuba, Ibaraki 305-0801 (Japan)
Publication Date:
OSTI Identifier:
22334234
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 213; Other Information: Copyright (c) 2014 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; ABSORPTION; ACTIVATION ENERGY; CATIONS; CRYSTALS; CUBIC LATTICES; MAGNETIC SUSCEPTIBILITY; NEUTRON DIFFRACTION; ORTHORHOMBIC LATTICES; OXIDES; PARAMAGNETISM; PEROVSKITE; PHASE TRANSFORMATIONS; SEMICONDUCTOR MATERIALS; SOLIDS; SPIN GLASS STATE; X RADIATION

Citation Formats

Qasim, Ilyas, Blanchard, Peter E.R., Kennedy, Brendan J., E-mail: B.Kennedy@chem.usyd.edu.au, Kamiyama, Takashi, Miao, Ping, and Torii, Shuki. Structural and electronic properties of Sr{sub 1−x}Ca{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}. United States: N. p., 2014. Web. doi:10.1016/J.JSSC.2014.02.011.
Qasim, Ilyas, Blanchard, Peter E.R., Kennedy, Brendan J., E-mail: B.Kennedy@chem.usyd.edu.au, Kamiyama, Takashi, Miao, Ping, & Torii, Shuki. Structural and electronic properties of Sr{sub 1−x}Ca{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}. United States. https://doi.org/10.1016/J.JSSC.2014.02.011
Qasim, Ilyas, Blanchard, Peter E.R., Kennedy, Brendan J., E-mail: B.Kennedy@chem.usyd.edu.au, Kamiyama, Takashi, Miao, Ping, and Torii, Shuki. Thu . "Structural and electronic properties of Sr{sub 1−x}Ca{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}". United States. https://doi.org/10.1016/J.JSSC.2014.02.011.
@article{osti_22334234,
title = {Structural and electronic properties of Sr{sub 1−x}Ca{sub x}Ti{sub 0.5}Mn{sub 0.5}O{sub 3}},
author = {Qasim, Ilyas and Blanchard, Peter E.R. and Kennedy, Brendan J., E-mail: B.Kennedy@chem.usyd.edu.au and Kamiyama, Takashi and Miao, Ping and Torii, Shuki},
abstractNote = {The series of Sr{sub 1−x}Ca{sub x}Ti{sub 1/2}Mn{sub 1/2}O{sub 3} perovskites has been prepared using solid state methods and their structures determined using combination of synchrotron X-ray and powder neutron diffraction. At room temperature the crystal structure evolves with increasing Ca content from Pm3{sup ¯}m→tetragonal I4/mcm→orthorhombic Pbnm, as a consequence of the sequential introduction of cooperative tilting of the (Ti/Mn)O{sub 6} octahedra. X-ray absorption measurements show the Mn is tetravalent in all oxides. Magnetic susceptibility measurements demonstrate all the oxides to be paramagnetic at room temperature, with a transition to a spin glass arrangement occurring at low temperatures. Electrical measurements prove that all the members are semiconductors and their activation energy increase with Ca doping amount. - Graphical abstract: Changes in the bond valence sums for the A- and B-sites in Sr{sub 1−x}Ca{sub x}Mn{sub 0.5}Ti{sub 0.5}O{sub 3} reflect changes in the symmetry of the oxides. - Highlights: • Structures of the Sr{sub 1−x}Ca{sub x}Ti{sub 1/2}Mn{sub 1/2}O{sub 3} perovskites studies using synchrotron X-ray and powder neutron diffraction. • Tilting of the octahedra occurs as Ca content increases. • Changes in the bond valence sums for the A- and B-sites cations reflect changes in the crystal symmetry. • Magnetic properties dependent of Ca content.},
doi = {10.1016/J.JSSC.2014.02.011},
url = {https://www.osti.gov/biblio/22334234}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 213,
place = {United States},
year = {2014},
month = {5}
}