Faculty of Chemistry Repository - Cherry
University of Belgrade - Faculty of Chemistry
    • English
    • Српски
    • Српски (Serbia)
  • English 
    • English
    • Serbian (Cyrilic)
    • Serbian (Latin)
  • Login
View Item 
  •   Faculty of Chemistry Repository - Cherry
  • Hemijski fakultet
  • Publikacije
  • View Item
  •   Faculty of Chemistry Repository - Cherry
  • Hemijski fakultet
  • Publikacije
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

The change of crystal symmetry and cation ordering in Li-Mg ferrites

Authorized Users Only
2002
Authors
Antić, Bratislav
Rodic, D
Nikolić, Aleksandar S.
Kacarevic-Popovic, Z
Karanovic, L
Article (Published version)
Metadata
Show full item record
Abstract
In this work we present results of synthesis and structural investigation of the spinels with general formula LixMg1-2xFe2+xO4, where 0.00less than or equal toxless than or equal to0.50. Ultrafine powder of MgFe2O4 (x=0.00) was prepared by thermal decomposition of a mixture of complex compounds [Mg(AA)(2)] and [Fe(AA)(3)] at 500degreesC (AA=acetylacetone). The solid solutions of LixMg1-2xFe2+xO4 (0.10less than or equal toxless than or equal to0.45) were synthesized by conventional ceramic method. The samples with xgreater than or equal to0.40 belong to ordered spinels with primitive cubic cell, space group P4(3)32 and the samples with xgreater than or equal to0.35 are spinels with face-centered cubic cell, space group Fd-3m. Crystal structures of samples with x=0.00, 0.40 and 0.45 were refined by the Rietveld method using DBWS-9411 software package. In ordered spinels (x=0.40, 0.45) Li+ ions occupy both 4b (preferentially) and 12d octahedral sites. At tetrahedral 8c positions Li+ ions ...were not found (within the experimental error). Mg2+ ions occupy octahedral 12d and tetrahedral 8c sites and Fe3+ ions occupy all three different cationic sites. Cation ordering in 1:3 type ordered spinel (the occupancy ratio of the Wyckoff's positions 4b and 12d) of Li+ and Fe3(+) at octahedral sites is not complete as in Li0.5Fe2.5O4, In MgFe2O4 spinel, cation distribution in the tetrahedral sites was determined and given by occupation numbers N: N(Mg-8a(2+))=0.183(7) and N(Fe-8a(3+))=0.817(7). (C) 2002 Elsevier Science BY All rights reserved.

Keywords:
crystal structure / X-ray diffraction and symmetry / synthesis
Source:
Journal of Alloys and Compounds, 2002, 336, 1-2, 286-291
Publisher:
  • Elsevier Science Sa, Lausanne

DOI: 10.1016/S0925-8388(01)01885-0

ISSN: 0925-8388

WoS: 000174761400046

Scopus: 2-s2.0-0037129097
[ Google Scholar ]
13
13
URI
http://cherry.chem.bg.ac.rs/handle/123456789/485
Collections
  • Publikacije
Institution
Hemijski fakultet

DSpace software copyright © 2002-2015  DuraSpace
About CHERRY - CHEmistry RepositoRY | Send Feedback

OpenAIRERCUB
 

 

All of DSpaceInstitutionsAuthorsTitlesSubjectsThis institutionAuthorsTitlesSubjects

Statistics

View Usage Statistics

DSpace software copyright © 2002-2015  DuraSpace
About CHERRY - CHEmistry RepositoRY | Send Feedback

OpenAIRERCUB