TEMPERATURE VARIATION OF PIEZOELECTRIC CONSTANT OF QUARTZ

The variation of the piezoelectric constant d11 of quartz has been measured from 22°C to near the transition temperature 573.3°C (highest recorded measurement, 565°C). The quartz was mounted on a metal anvil and its piezoelectric response was excited by dropping a steel ball onto the center of the quartz disk. At room temperature, a value of d11 was found to be -2.16×10-12 C/N with a standard deviation of 0.11×10-12. From 20°-200°C, the magnitude of d 11 decreases linearly at -4.5% per hundred degrees, in close agreement with the behavior observed by Langevin. Above 200°C, the value decreases sharply, following a smooth curve and reaching zero in the near vicinity of 573.3°C. © 1969 The American Institute of Physics.