Surface acoustic wave properties on rotated Y-cut langasite single crystal substrates

Michio Kadota, Jun Nakanishi, Takeshi Kitamura, Makoto Kumatoriya

Research output: Contribution to conferencePaperpeer-review

5 Citations (Scopus)

Abstract

The langasite substrate has been expected to have a large electromechanical coupling factor and an excellent temperature coefficient of frequency (TCF) in surface acoustic wave (SAW) properties. The large size of langasite single crystal was grown by Czochralski method. A leaky SAW (LSAW) and a leaky pseudo SAW (LPSAW) of the various routed Y cut langasite substrates were measured by an ultrasonic microscope. Of them, their measured results on Euler angle (0°,150°,0 to approximately 180°) and (0°,10 to approximately 170°,0°) substrates were compared with the theoretical values calculated by five kinds of material constants. They were similar to calculated values using Ilyaev's material constants. Variations of LPSAW velocities on Z-cut plates having defects called core, were also measured and evaluated by the ultrasonic microscope. The substrates showed large variations of LPSAW velocities. The TCF's of Rayleigh SAW were measured by measuring center frequency of transversal filter taking account of Al-IDT thickness. It was clarified that (0°,142 to approximately 143°,24 to approximately 25°) substrates showed excellent TCF's at normalized Al-IDT thickness 0.0125.

Original languageEnglish
Pages357-360
Number of pages4
Publication statusPublished - 1998 Dec 1
EventProceedings of the 1998 11th IEEE International Symposium on Appliations of Ferroelectrics (ISAF-XI) - Montreaux, Switz
Duration: 1998 Aug 241998 Aug 27

Other

OtherProceedings of the 1998 11th IEEE International Symposium on Appliations of Ferroelectrics (ISAF-XI)
CityMontreaux, Switz
Period98/8/2498/8/27

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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