Optimizing the physical characterizations of orthoferrites to be used as pressure and gamma sensor

被引：29
作者：
Ahmed, MA [1 ]
El-Dek, SI [1 ]
机构：
[1] Cairo Univ, Fac Sci, Dept Phys, Mat Sci Lab 1, Giza, Egypt
来源：
MATERIALS LETTERS | 2006年 / 60卷 / 12期
关键词：
orthoferrite; antiferromagnet; gamma irradiation; ac resistivity; pressure sensor;
D O I：
10.1016/j.matlet.2005.11.076
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnetic and electrical properties of a series of orthoferrites: R0.7Ca0.3FeO3, R=La, Dy, Y, Er and Gd, were investigated from room temperature up to about 800 K. All samples were antiferromagnetic with a weak ferromagnetic component due to small canting of the Fe 31 moments. The correlation between magnetic transition and structural distortion is discussed on the basis of the variation of the Neel temperature as a function of the tolerance factor. The ac resistivity data at different frequencies from 100 kHz to 5 MHz is presented and discussed in view of structural characterization. The effect of gamma-irradiation on both ac resistivity and magnetic susceptibility is investigated. Also, the influence of mechanical pressure on the dc resistivity was studied. (c) 2005 Elsevier B.V All rights reserved.
引用
收藏
页码：1437 / 1446
页数：10
相关论文
共 18 条
[1]   PEROVSKITE ELECTRODES FOR SENSORS [J].
ALCOCK, CB ;
DOSHI, RC ;
SHEN, Y .
SOLID STATE IONICS, 1992, 51 (3-4) :281-289
[2]   The role of erbium magnetization anisotropy during the magnetic reorientation transition in ErFeO3 [J].
Bazaliy, YB ;
Tsymbal, LT ;
Kakazei, GN ;
Wigen, PE .
JOURNAL OF APPLIED PHYSICS, 2004, 95 (11) :6622-6624
[3]  
BELOV KP, 1979, OREINTATION PHASE TR
[4]  
Blomen L., 1993, FUEL CELL SYSTEMS
[5]   Crystal structure of solid solutions REFe1-x(Al or Ga)xO3 (RE = Tb, Er, Tm) and the correlation between superexchange interaction Fe+3-O-2-Fe+3 linkage angles and Neel temperature [J].
Bombik, A ;
Lesniewska, B ;
Mayer, J ;
Pacyna, AW .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2003, 257 (2-3) :206-219
[6]   OXYGEN-ION MIGRATION IN PEROVSKITE-TYPE OXIDES [J].
CHERRY, M ;
ISLAM, MS ;
CATLOW, CRA .
JOURNAL OF SOLID STATE CHEMISTRY, 1995, 118 (01) :125-132
[7]  
Cotton F A., 1998, Advanced Inorganic Chemistry
[8]  
Cracknell, 1975, MAGNETISM CRYSTALLIN
[9]  
INONE T, 1990, J ELECTROCHEM SOC, V137, P2523
[10]  
McCarty J. G., 1990, CATAL TODAY, V8, P231, DOI [10.1016/0920- 5861(90)87020-4, DOI 10.1016/0920-5861(90)87020-4]
12