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High-energy electron irradiation study of relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 and Pb1−xLax[Mg(1+x)/3Nb(2−x)/3]O3 by transmission electron microscopy

Published online by Cambridge University Press:  31 January 2011

Shu Miao ,
Jing Zhu ,
X. W. Zhang  and
X. H. Chen
Shu Miao
Affiliation:
Electron Microscopy Laboratory, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China, and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Jing Zhu
Affiliation:
Electron Microscopy Laboratory, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China, and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
X. W. Zhang
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China, and State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
X. H. Chen
Affiliation:
Electron Microscopy Laboratory, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China, and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
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Abstract

The electron irradiation sensitivities of Pb(Mg1/3Nb2/3)O3 (PMN) and Pb1−xLax[Mg(1+x)/3Nb(2−x)/3]O3 (PLMN) ceramics were investigated by transmission electron microscopy. Nanoscale Pb particles formed in these materials under electron beam radiation. It was found that these fine Pb particles generally had a preferred crystallographic orientation relationship with the PMN/PLMN host and always existed at positions slightly rich in Mg2+. A preliminary mechanism involving defect chemistry reactions is proposed to interpret this unusual Pb precipitation. Possible limitations to the practical applications of these materials are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 10 , October 2002 , pp. 2615 - 2620
Copyright
Copyright © Materials Research Society 2002

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