Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 69: Issue 3
Low temperature heat capacities of mechanically alloyed La-doped PbWO4 system
Authors:
S. Takai Tottori University Department of Materials Science, Faculty of Engineering Minami 4-101 Koyamacho, Tottori 680-0945 Japan Minami 4-101 Koyamacho, Tottori 680-0945 Japan

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T. Nakanishi Tottori University Department of Materials Science, Faculty of Engineering Minami 4-101 Koyamacho, Tottori 680-0945 Japan Minami 4-101 Koyamacho, Tottori 680-0945 Japan

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T. Tojo Tokyo Institute of Technology Materials and Structures Laboratory 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503 Japan 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503 Japan

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H. Kawaji Tokyo Institute of Technology Materials and Structures Laboratory 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503 Japan 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503 Japan

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T. Atake Tokyo Institute of Technology Materials and Structures Laboratory 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503 Japan 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503 Japan

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T. Esaka Tottori University Department of Materials Science, Faculty of Engineering Minami 4-101 Koyamacho, Tottori 680-0945 Japan Minami 4-101 Koyamacho, Tottori 680-0945 Japan

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Pages:
805–811
Online Publication Date:
02 Nov 2004
Publication Date:
01 Jul 2002
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1020695620191
Keywords:
oxide ion conductor; heat capacity; PbWO4; scheelite-type structure; defect structure; mechanical alloying
Restricted access

Abstract  

Heat capacity measurements were carried out on Pb1-xLaxWO4+x/2 (x=0.2) and Pb1-xLa2x/3WO4 (x=0.2, 0.5) solid solutions prepared by sintering and mechanical alloying (MA) methods. For all the solid solutions, sintered samples showed slightly larger heat capacity around 100 K in comparison with MA samples, which was presumably caused by the excitation of mobile oxide ion motion. For sintered scheelite-type structured PbWO4s, high-temperature synthesis introduced oxide ion interstitials even for the Pb1-xLa2x/3WO4 system, which resulted in the excess heat capacity at low temperature for excitation. On the other hand, for the samples prepared by room-temperature MA technique, oxide ion seemed to occupy the regular sites rather than interstitial ones and excess heat capacities were not observed.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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