In the quest of materials with high temperature ferromagnetism and low temperature anti-ferromagnetism, we prepare Co3-xMnxTeO6; (0 < x ≤ 2) solid solutions. Room temperature structural investigations on these solid solutions as a function of Mn concentration using Synchrotron X-ray diffraction (SXRD) and X-ray absorption near edge structure measurements in corroboration with magnetism are presented. Phase diagram obtained from Rietveld Refinement on SXRD data as a function of Mn concentration indicates doping disproportionate mixing of both monoclinic (C2/c) and rhombohedral (R ) structure for x < 0.5, while only R structure for x ≥ 0.5. Further, it shows increase in both lattice parameters as well as average transition metal-oxygen (Co/Mn-O) bond lengths for x ≥ 0.5. Co and Mn K-edge XANES spectra reveal that both Co and Mn are in mixed oxidation state, Co2+/Mn2+ and Co3+/Mn3+. Relative ratios of Co3+/Co2+ and Mn3+/Mn2+ obtained using Linear combination fit decrease with increasing x (for x ≥ 0.5). These structural and spectroscopic evidences are used to provide possible interpretation of the observed paramagnetic to ferromagnetic transition at around 185 K followed by an enhanced antiferromagnetic transition ∼45 K for x = 0.5.
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21 August 2014
Research Article|
August 19 2014
Structural investigations on Co3-xMnxTeO6; (0 < x ≤ 2); High temperature ferromagnetism and enhanced low temperature anti-ferromagnetism
Harishchandra Singh;
Harishchandra Singh
1Indus Synchrotron Utilization Division,
Raja Ramanna Centre for Advanced Technology
, Indore—452013, India
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A. K. Sinha;
A. K. Sinha
a)
1Indus Synchrotron Utilization Division,
Raja Ramanna Centre for Advanced Technology
, Indore—452013, India
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Haranath Ghosh;
Haranath Ghosh
a)
1Indus Synchrotron Utilization Division,
Raja Ramanna Centre for Advanced Technology
, Indore—452013, India
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M. N. Singh;
M. N. Singh
1Indus Synchrotron Utilization Division,
Raja Ramanna Centre for Advanced Technology
, Indore—452013, India
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Parasmani Rajput;
Parasmani Rajput
2Atomic & Molecular Physics Division,
Bhabha Atomic Research Centre
, Mumbai—400085, India
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C. L. Prajapat;
C. L. Prajapat
3Technical Physics Division,
Bhabha Atomic Research Centre
, Mumbai—400085, India
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M. R. Singh;
M. R. Singh
3Technical Physics Division,
Bhabha Atomic Research Centre
, Mumbai—400085, India
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G. Ravikumar
G. Ravikumar
3Technical Physics Division,
Bhabha Atomic Research Centre
, Mumbai—400085, India
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a)
Authors to whom correspondence should be addressed. E-mail addresses: anil@rrcat.gov.in and hng@rrcat.gov.in. Tel.: +91-731-244 -2125/2123; Fax: +91-731-244 2140.
J. Appl. Phys. 116, 074904 (2014)
Article history
Received:
June 25 2014
Accepted:
August 05 2014
Citation
Harishchandra Singh, A. K. Sinha, Haranath Ghosh, M. N. Singh, Parasmani Rajput, C. L. Prajapat, M. R. Singh, G. Ravikumar; Structural investigations on Co3-xMnxTeO6; (0 < x ≤ 2); High temperature ferromagnetism and enhanced low temperature anti-ferromagnetism. J. Appl. Phys. 21 August 2014; 116 (7): 074904. https://doi.org/10.1063/1.4893330
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