Piezoelectric and elastic properties of β phase quartz

Temperature characteristics of β‐phase quartz resonators and their application to accurate temperature sensors in high‐temperature region

“…However, when other phase transitions occur at 870 °C and higher, the piezoelectric properties disappear and resonance is not observed. On the other hand, we detected piezoelectric resonance at temperatures up to 1000 °C and higher, and reported the basic constants of this resonance [3]. In the present study, we investigated an even higher temperature region; in particular, we observed piezoelectric resonance up to 1300 °C and reconsidered the previously measured results.…”

“…The characteristics of α-phase quartz oscillators are well studied, but piezoelectric oscillation in the β-phase has not attracted much attention, and few reports are available [1][2][3]. Quartz undergoes a transition from the α-phase to the β-phase at 573 °C.…”

“…Quartz undergoes a transition from the α-phase to the β-phase at 573 °C. The characteristics of α-phase quartz oscillators are well studied, but piezoelectric oscillation in the β-phase has not attracted much attention, and few reports are available [1][2][3]. The point group of α-quartz is 32, while β-quartz has point group 622 with high symmetry; however, there is a single independent piezoelectric constant, and thickness resonance is excited in directions inclined to the crystal axes.…”

Cut Angle Dependences of Resonant Characteristics of β-Phase Quartz

“…In 1998, Ochiai et al reported the piezoelectricity of quartz at around 960 C. 5) Uno and Noge showed the piezoelectric behavior of quartz at around the phase transition temperature. 6,7) They also observed piezoelectric resonance with a considerably high Q-factor at 1,000 C. 8) In this paper, we describe the piezoelectric properties of quartz up to around 1,300 C. Clear piezoelectric resonances were observed from the phase transition temperature (573 C) to 1,300 C. Considering the symmetric property of -phase quartz, the maximum electromechanical coupling constant may be obtained by 45 rotated Y-cut plates. Because of its large frequency-temperature characteristics, -phase quartz may be applicable to precise temperature sensors for high-temperature regions up to 1,000 C. However, at high ambient temperatures above 1,000 C, the dielectric loss increases to a large degree and this affects the resonance characteristics, especially the Q factor.…”

“…Some authors have reported the piezoelectric resonances of -phase quartz below approximately 1,000 C. [3][4][5][6][7][8] In 1959, White reported the piezoelectric resonances from 573-850 C. 4) However, the piezoelectricity of -phase quartz had not been investigated for a long time. In 1998, Ochiai et al reported the piezoelectricity of quartz at around 960 C. 5) Uno and Noge showed the piezoelectric behavior of quartz at around the phase transition temperature.…”