High-Temperature Measurements of Q-Factor in Rotated X-Cut Quartz Resonators

The Q-factors of piezoelectric resonators fabricated from natural and synthetic quartz with a 34° rotated X-cut orientation have been measured at temperatures up to 325°C. The synthetic material, which was purified by electrolysis, retains a high enough Q to be suitable for high-temperature pressure-transducer applications, whereas the natural quartz is excessively lossy above ~200°C application. The present results are compared to results obtained previously at AT-cut resonators.