This title appears in the Scientific Report :
2018
Please use the identifier:
http://dx.doi.org/10.1063/1.5027137 in citations.
Please use the identifier: http://hdl.handle.net/2128/21268 in citations.
Cation distribution and magnetic properties of Zn-substituted CoCr 2 O 4 nanoparticles
Cation distribution and magnetic properties of Zn-substituted CoCr 2 O 4 nanoparticles
CoCr2O4 is a normal spinel where Co occupies the tetrahedral (A) site and Cr occupies the octahedral (B) site; it is important to examine the cation distribution and magnetic properties by substituting a non-magnetic ion like Zn. In this context, we have synthesized pure phase ZnxCo1-xCr2O4 (x = 0.0...
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Personal Name(s): | Jagadish Kumar, G. |
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Banerjee, Alok / Sinha, A. S. K. / Su, Y. / Nemkovski, K. / Rath, Chandana (Corresponding author) | |
Contributing Institute: |
Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Journal of applied physics, 123 (2018) 22, S. 223905 - |
Imprint: |
Melville, NY
American Inst. of Physics
2018
|
DOI: |
10.1063/1.5027137 |
Document Type: |
Journal Article |
Research Program: |
FRM II / MLZ Jülich Centre for Neutron Research (JCNS) |
Subject (ZB): | |
Link: |
Published on 2018-06-14. Available in OpenAccess from 2019-06-14. Published on 2018-06-14. Available in OpenAccess from 2019-06-14. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/21268 in citations.
CoCr2O4 is a normal spinel where Co occupies the tetrahedral (A) site and Cr occupies the octahedral (B) site; it is important to examine the cation distribution and magnetic properties by substituting a non-magnetic ion like Zn. In this context, we have synthesized pure phase ZnxCo1-xCr2O4 (x = 0.05, 0.1) of crystallite size 10 nm through conventional co-precipitation technique. Fourier transform of Co, Zn, and Cr K-edge spectra obtained from extended X-ray absorption fine structure demonstrates that while Co and Zn prefer the A site, Cr strongly occupies the B site. The paramagnetic to long range ferrimagnetic transition, TC, decreases from 97 K in CoCr2O4 (bulk) to 87.4 K at x = 0.1 with an intermediate TC of 90 K at x = 0.05. The decrease in TC is ascribed to decrease in A-B exchange interaction confirming the preferential occupation of Zn2+ ions towards the A site. The spin-spiral transition, TS, decreases from 27 K in bulk (CoCr2O4) to 24 K at x = 0.1 followed by a spin lock-in transition, TL, observed at 10 K which remains unchanged with increase in Zn concentration. The diffuse neutron scattering in both compositions shows the evidence of long range spiral ordering in contrast to the simultaneous formation of long and short range order in single crystals of CoCr2O4. The decrease in maximum magnetization from 9 to 8 emu/g and an increase in coercivity from 3.2 to 5.2 kOe at 2 K with an increasing Zn concentration from 0.05 to 0.1 have been explained by considering the Yafet-Kittel model |