Pressure and temperature dependence of dielectric properties of brominated trissarcosine calcium chloride

Abstract

The dielectric properties of brominated trissarcosine calcium chloride (TSCCB) with chlorine and bromine in molar fractions (1-x) and x respectively (x<or=1.0) were measured under various pressures up to 9 kbar. It was found that the ferroelectric transition temperature Tc and the spontaneous polarisation Ps decrease rapidly with increasing the molar fraction x of bromide, whereas Tc increases greatly with pressure and Ps is almost independent of pressure. The triple point (paraelectric-ferroelectric-new phase) of TSCCB shifted towards higher pressures and lower temperatures with increasing x. By observing the P-E hysteresis loop, the ferroelectric transition of TSCB was found to appear on application of pressure (e.g. at 7 kbar at -165 degrees C).

Charge Transfer Induced Multifunctional Transitions with Sensitive Pressure Manipulation in a Metal–Organic Framework

“…These characteristic features are reminiscent of a pressure-induced ferroelectric phase transition as observed in other compounds. 30,31 As shown in Figure 7b, near the P C , the derivative of dielectric loss also shows a sharp transition. We therefore conclude that the room-temperature ferroelectric phase is indeed realized in Fe 2 Co-MOF via the application of external pressure accompanying the Fe−Co ICT.…”

A bibliographical review of the high pressure studies of ferroelectric phase transitions

“…The ferroelectric phase in trisarcosine calcium bromide and trisarcosine calcium iodide gets stabilized only under pressure (Fujimoto et al, 1982b;1984b). Several workers have studied the pressure effect on NH,LiSO,.…”

Phase transitions in tris-sarcosine calcium chloride (TSCC) to 14 GPa

“…Fujimoto et al [12][13][14] investigated deuterated and brominated crystals. More recently, dielectri~'~ and NMR8,16 studies of DTSCC have been made.…”