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Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes

Ewe, L. S. and Hamadneh, Imad and Salamab, Hazar A. and Abd Shukor, Roslan (2008) Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes. Physica B, 403 (13-16). pp. 2394-2398. ISSN 2394–2398

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Official URL: http://dx.doi.org/10.1016/j.physb.2007.12.022

Abstract

The longitudinal and shear sound velocities in colossal magnetoresistive material La0.67Ca0.33MnO3 sintered at 1100, 1250 and 1350 1C with average grain size 1, 3 and 5 mm, respectively, have been measured from 80 to 300K using the pulse-echo-overlap method.A pronounced increase in the longitudinal sound velocity was observed in all samples around the insulator–metal transition temperature (TIM272 K). XRD patterns showed the orthorhombic structure for all samples. The longitudinal and shear velocities showed the largest hysteresis for the sample with 3 mm grain size. A step-like shear sound velocity anomaly near 120K during cooling or warming was observed to be dependent on the grain size.

Item Type:Article
Keyword:Sound velocity, Debye temperature, Grain size, Manganites
Faculty or Institute:Faculty of Science
Publisher:Elsevier
DOI Number:10.1016/j.physb.2007.12.022
Altmetrics:http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.physb.2007.12.022
ID Code:5655
Deposited By: Najwani Amir Sariffudin
Deposited On:30 Apr 2010 12:40
Last Modified:22 Jul 2010 20:39

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