High Temperature Dielectric, Elastic and Piezoelectric Coefficients of Shear Type Lithium Niobate Crystals

Abstract:

In this paper shear type lithium niobate has been studied. The impedance-frequency characteristics were measured at high temperatures. This was carried out by placing the samples inside a furnace and performing in-situ impedance measurements at up to 600°C. The characteristic frequencies, capacitance, density and dimensions of samples were used to calculate the dielectric, elastic and piezoelectric coefficients. Prototype transducers were built using shear type lithium niobate crystals. The initial ultrasonic experiments show that it can be used at temperatures up to 450°C to transmit and receive guided wave signals at 70 kHz. This will enable design and manufacture of high temperature transducers for continuous guided wave monitoring of power plants.

• Periodical: Key Engineering Materials (Volume 543)
• Pages: 117-120
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.543.117
• Online since: March 2013
• Authors: Abbas Mohimi, Philip Richardson, Phil Catton, Tat Hean Gan, Wamadeva Balachandran, Cem Selcuk
• Keywords: Continuous Guided Wave Monitoring, Curie Temperature, High Temperature Piezoelectric, Impedance Measurements, Lithium Niobate, Nondestructive Testing (NDT), Power Plant

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