Quartzhomeotypic gallium orthophosphate: A new high-tech piezoelectric crystal

Piezoelectric crystals belong to the most important functional materials for the electronic and electromechanic industries. Many future technologies will demand for materials having the excellent properties owned by quartz, but higher electromechanical coupling and high thermal stability in their pr...

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Bibliographic Details
Published in:Ferroelectrics 1997-01, Vol.202 (1), p.65-69
Main Author: Krempl, P. W.
Format: Article
Language:English
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Summary:Piezoelectric crystals belong to the most important functional materials for the electronic and electromechanic industries. Many future technologies will demand for materials having the excellent properties owned by quartz, but higher electromechanical coupling and high thermal stability in their properties up to temperatures above 600°C. It has been demonstrated, that single crystals of quartzhomeotypic gallium orthophosphate (GaPO 4 ) can meet all these requirements. This material has all the advantages of quartz (e.g. existence of highly temperature compensated orientations for bulk and surface acoustic wave devices, absence of pyroelectricity, negligible electric conductivity, chemical resistivity, long term stability), but has a coupling constant four times higher than quartz and operation temperatures up to 930°C. Furthermore, the temperature dependences of most physical properties which are important for the final device specifications are below the allready good room temperature values for quartz.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150199708213461