This paper reports the first evidence of piezoelectric properties of K 4 LiH 3 (SO 4 ) 4 KLHS crystal in the temperature range 12 K–300 K. Moreover, the anomaly in the elastic properties of this crystal observed at about 50 K by the composite oscillator bar method has been related to a proton glassy state. The elastic properties of the crystal determined by piezoelectric measurements revealed an anisotropy and dispersion in the (110) plane.
Acknowledgments
This work has been supported by the Ministry of Education and Science, Grant No. 1Po3B 066 30.