Paper Title:
Electrical Properties of La(Cr,Mn)O3 NTC Materials
  Abstract

We investigated the electrical properties of the perovskite R(Cr,Mn)O3 (where R is selected from various rare earth elements and Y), which is suitable for use in negative temperature coefficient (NTC) thermistors. The substitutions of Mn for Cr in La(Cr,Mn)O3 and larger ions for R3+ decreased both the resistivities (r) and thermistor constants (B values) estimated from measurements at 25°C and 50°C according to r = r0exp(B/T). The activation energies of the carrier number (Eg) and carrier mobility (WH) were estimated by measuring the thermoelectric power and resistivity. A change in WH corresponded to a change in the B value. We discussed the relationship between the grand state electronic configuration of the M3+ ions and the local lattice distortion around the M3+ ions. The change in WH could be qualitatively linked to the M3d– O2p transfer energy, which is corresponding to the hybridization between the M3d and O2p orbital (M: transition metal elements, O: oxygen).

  Info
Periodical
Edited by
Chazono Hirokazu, Fujihara Shinobu, Katayama Keiichi, Masumoto Hiroshi, Mizoguchi Teruyasu, Osada Minoru, Shinozaki Kazuo and Takeda Hiroaki
Pages
237-240
DOI
10.4028/www.scientific.net/KEM.485.237
Citation
T. Fujita, K. Fujiwara, T. Yamaguchi, "Electrical Properties of La(Cr,Mn)O3 NTC Materials", Key Engineering Materials, Vol. 485, pp. 237-240, 2011
Online since
July 2011
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: Jelena Dukić, Snezana Bošković, B. Matović, B. Dimčić, Lj. Karanović
Abstract:Two nanopowders with nominal compositions (Ca0.7La0.3)MnO3 (CLM) and (Ca0.7La0.3)(Mn0.8Ce0.2)O3 (CLMC) were synthesized by a modified...
231
Authors: Su Hua Lv, Shu Lang Guo, Hua Ji
New Functional Materials
Abstract:SBT Ferroelectric Materials are prepared by solid reaction sintering process after doping V2O5 to SBT bulk and its...
608
Authors: Yu Hua Zhu
Abstract:The influence of grain size on the lattice constant in some nanocrystallites of perovskite structure was studied in experiment. Some...
1343
Authors: Gang Xue, Xue Fang Zhang, Sai Fei Wang, Chao Yue Zhao
Chapter 1: Academic Frontiers
Abstract:A series of rare earth perovskite-type oxides...
77
Authors: Hai Lang Ju, Zong Liang Mao
Chapter 2: Optical Materials and Devices
Abstract:LiNbO3 is an important crystal which has piezoelectric, ferroelectric and electro-optical functions. It has a wide range of applications....
87