Paper Title:
A-Site Cational Size Disorder Effects in La0.55Ca0.45MnO3
  Abstract

The effects of A-site cation size disorder in ABO3 type ferromagnetic metallic La0.55Ca0.45MnO3 system have been studied by substituting La3+ and Ca2+ by other ions, while keeping the valency of Mn ions and the A-site cation mean radius constant in the substituted compounds with different A-site ionic radii variance σ2 = Σi (xiri 2 − 2), where xi and ri are the atomic fraction and ionic radii of i-type ions at A-site, respectively. It is revealed that the A-site disorder induces the decreasing of the magnetization and the increasing of the resistivity. The ferromagnetic Curie point TC decreases with the increasing of the A-site ionic radii variance, too. Moreover, the ground state of the system transits from ferromagnetic metal to glass insulator upon increasing variance of the A-site ionic radii from 0.0003 for La0.55Ca0.45MnO3 to 0.009 for Gd0.55Sr0.45MnO3. It is argued that the suppression of the ferromagnetism is ascribed to the enhanced radial distortion of the MnO6 octahedra due to the increasing A-site disorder.

  Info
Periodical
Key Engineering Materials (Volumes 336-338)
Edited by
Wei Pan and Jianghong Gong
Pages
351-355
DOI
10.4028/www.scientific.net/KEM.336-338.351
Citation
K.F. Wang, X.P. Liu, Q.C. Li, Y. Wang, L.F. Wang, S. Dong, H. Yu, J.M. Liu, "A-Site Cational Size Disorder Effects in La0.55Ca0.45MnO3", Key Engineering Materials, Vols. 336-338, pp. 351-355, 2007
Online since
April 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: J. Feng, Q.B. Bo, P. Che, J.P. Wang, M.F. Lu, J.F. Liu, Xue Qiang Cao, Jian Meng
Abstract:The layered manganese oxides LaSr2Mn2-xTxO7 (T=Fe, Cr and Ni) has been prepared. The effect of substitution of transition metal ions for Mn...
2227
Authors: S.V. Trukhanov, I.O. Troyanchuk, A.V. Trukhanov, H. Szymczak
Abstract:A-site ordered PrBaMn2O6 manganites were obtained by a two-step synthesis process. The chemical composition, crystal structure, magnetic and...
187
Authors: V.A. Khomchenko, Michael Kopcewicz, Armandina M. Lima Lopes, Yuri G. Pogorelov, J.P. Araujo, Joaquim M. Vieira, Andréi L. Kholkin
Abstract:Investigation of crystal structure and magnetic properties of the diamagnetically- substituted Bi1-xAxFeO3-x/2 (A= Ca, Sr, Pb, Ba; x= 0.2,...
131
Authors: Yeong Seung Jeong, M.S. Anwar, Faheem Ahmed, Seung Rok Lee, Bon Heun Koo
Chapter 2: Materials Science and Applications, Materials Processing Technology
Abstract:We report the magnetic transition and large magnetic entropy change in Sr doped lanthanum manganites. Polycrystalline...
225
Authors: Sohrab Manouchehri, Seyed Taghi Mohammadi Benehi, Mohammad Hassan Yousefi
Abstract:Ferrites nanopowder of spinel MgxMn1-xFe2O4 (with x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) synthesized...
38