Internal friction and Young's modulus of SrBi2Ta2O9ceramics

Feng Yan, Xiaobing Chen, Peng Bao, Yening Wang, Jianshe Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)

Abstract

The internal friction (IF) and the Young's modulus of SrBi2Ta2O9(SBT) ceramics were measured by using the reed vibration method in the temperature range from 100 to 600 K with kilo-hertz frequencies. A high IF peak associated with a modulus defect appeared around 500 K, which was assumed to be due to the migration of oxygen vacancies with the activation energy U of about 0.95 eV. The mechanism of the IF peak was discussed in detail. At 570 K, an IF peak due to the viscous motion of domain walls near the Curie temperature was found. Below room temperature, a low IF peak with a modulus defect was found with peak temperature of 200-250 K, which varied for tens of degrees in different samples. This peak was due to the depinning process of 90° domain walls from oxygen vacancies. These results can be helpful in explaining the excellent fatigue resistance property of SBT thin films at room temperature.
Original languageEnglish
Pages (from-to)1453-1457
Number of pages5
JournalJournal of Applied Physics
Volume87
Issue number3
DOIs
Publication statusPublished - 1 Feb 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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