Abstract
Dielectric properties of tris-sarcosine bromide ((CH3NHCH2COOH)3CaBr2) which is isomorphous to the ferroelectric crystal tris-sarcosine calcium chloride ((CH3NHCH2COOH)3CaCl2, TSCC) have been investigated under high pressure down to 4.2 K. The hydrostatic pressure of excellent quality has been generated using helium gas as a pressure transmitting medium. The ferroelectric activity has been confirmed by the dielectric hysteresis loops. The pressure-temperature phase diagram of the ferroelectric phase transition is determined from the peak of the dielectric constant of the b-plate in various isobaric measurements. The transition temperature is well represented by an equation TC∝(p−pC)1⁄2 which is a well known relationship for quantum ferroelectrics.
