Journal Article FZJ-2019-00293

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png
Cation distribution and magnetic properties of Zn-substituted CoCr 2 O 4 nanoparticles

 ;  ;  ;  ;  ;

2018
American Inst. of Physics Melville, NY

Journal of applied physics 123(22), 223905 - () [10.1063/1.5027137]

This record in other databases:  

Please use a persistent id in citations:   doi:

Abstract: 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

Keyword(s): Information and Communication (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

Classification:

Contributing Institute(s):
  1. JCNS-FRM-II (JCNS-FRM-II)
  2. Streumethoden (JCNS-2)
Research Program(s):
  1. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
  2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
Experiment(s):
  1. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)

Appears in the scientific report 2018
Database coverage:
Medline ; Embargoed OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; National-Konsortium ; NationallizenzNationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection
Click to display QR Code for this record

The record appears in these collections:
Institute Collections > JCNS > JCNS-FRM-II
Document types > Articles > Journal Article
Institute Collections > JCNS > JCNS-2
Workflow collections > Public records
Publications database
Open Access

 Record created 2019-01-15, last modified 2021-01-30


Published on 2018-06-14. Available in OpenAccess from 2019-06-14.:
Download fulltext PDF Download fulltext PDF (PDFA)
External link:
Download fulltextFulltext by OpenAccess repository
Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)