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Transport and Electromechanical Properties of Ca3TaGa3Si2O14 Piezoelectric Crystals at Extreme Temperatures

Published online by Cambridge University Press:  14 January 2019

Yuriy Suhak
Affiliation:
Clausthal University of Technology, Am Stollen 19B, Goslar, 38640, Germany.
Ward L. Johnson
Affiliation:
National Institute of Standards and Technology, 325 Broadway St., Boulder, CO80305, U.S.A.
Andrei Sotnikov
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, Dresden, 01069, Germany.
Hagen Schmidt
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, Dresden, 01069, Germany.
Holger Fritze
Affiliation:
Clausthal University of Technology, Am Stollen 19B, Goslar, 38640, Germany.
Corresponding

Abstract

Transport mechanisms in structurally ordered piezoelectric Ca3TaGa3Si2O14 (CTGS) single crystals are studied in the temperature range of 1000-1300 °C by application of the isotope 18O as a tracer and subsequent analysis of diffusion profiles of this isotope using secondary ion mass spectrometry (SIMS). Determined oxygen self-diffusion coefficients enable calculation of oxygen ion contribution to the total conductivity, which is shown to be small. Since very low contributions of the cations have to be expected, the total conductivity must be dominated by electron transport. Ion and electron conductivities are governed by different mechanisms with activation energies (1.9±0.1) eV and (1.2±0.07) eV, respectively. Further, the electromechanical losses are studied as a function of temperature by means of impedance spectroscopy on samples with electrodes and a contactless tone-burst excitation technique. At temperatures above 650 °C the conductivity-related losses are dominant. Finally, the operation of CTGS resonators is demonstrated at cryogenic temperatures and materials piezoelectric strain constants are determined from 4.2 K to room temperature.

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Articles
Creative Commons
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Materials Research Society 2019

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Transport and Electromechanical Properties of Ca3TaGa3Si2O14 Piezoelectric Crystals at Extreme Temperatures
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