High-temperature acoustic loss of AT-cut quartz crystals
作者： J.E. Ferris , J.J. Martin
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摘要: Sensor applications are increasing the use of quartz crystals at high-temperatures. At these temperatures interstitial alkalis thermally escape from traps and drift in shallow potential wells Z-axis channel. Their random motion leads to a activated acoustic loss which may degrade oscillator performance. Point defects also lead peaks; Fraser has reported peak near 300/spl deg/C swept quartz. We have investigated unswept (Li-compensated), Na-compensated, (H-compensated) AT-cut resonator blanks room temperature over 400/spl deg/C. In quartz, we find centered 600 K increases linearly with aluminum content. This most likely results relaxation Al-OH center. The Na-compensated resonators remained relatively constant up about 500 K; higher it increased exponentially T(K)/sup -1/. Al content caused them larger 400 range than blanks. >
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