Evolution of internal friction and dielectric relaxation peaks in La2Mo2O9-based oxide-ion conductors assessed by a nonlinear peak-fitting method
✍ Scribed by Fang, Q. F. ;Wang, X. P. ;Zhang, G. G. ;Cheng, Z. J.
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 168 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Abstract
In this paper, a nonlinear peak‐fitting program is proposed based on the Bevington method, which would be helpful for the decomposition of relaxation peaks in the investigation of both internal friction and dielectric relaxation. Using this program, two severely overlapped relaxation peaks of internal friction and dielectric relaxation in pure and doped La~2~Mo~2~O~9~ oxide‐ion conductors have been successfully decomposed, and thus the peak height and peak position of both peaks exactly determined. From the fitting results the conclusion is reached that in pure La~2~Mo~2~O~9~ samples there are two relaxation internal friction peaks (P~1~ at lower temperature and P~2~ at higher temperature), but only one dielectric relaxation peak (P~d2~). Another dielectric relaxation peak (P~d1~) appears at lower temperature only in appropriately doped samples. With increasing doping content of Ca, K, and Bi, the activation energies of all peaks increase, and the height of the P~2~ peak decreases while that of the P~1~ peak increases. However, the peak heights of the P~d1~ and P~d2~ peaks increase at first and then decrease after passing through a maximum. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)