LiNbO3 composite oscillator for internal friction and modulus measurement at elevated temperatures

Abstract

We describe a longitudinal LiNbO3 composite oscillator at 100–300 kHz to measure internal friction and Young’s modulus of a small sample bar, which is directly heated in a furnace at elevated temperatures up to 800 °C. Resonant frequency, mechanical loss, and electric conductivity of a fabricated LiNbO3 oscillator are measured as a function of temperature. The present method is successfully applied to YBa2Cu3O6+x wires with 1 mm diameter and 7 mm length at 30–800 °C.