PHASE-TRANSITION IN CRYSTALLINE P-POLYPHENYLS - HEAT-CAPACITY OF 4,4'''-DIFLUORO-P-QUATERPHENYL

被引：18

作者：

SAITO, K

YAMAMURA, Y

SAITOH, H

MATSUYAMA, H

KIKUCHI, K

IKEMOTO, I

机构：

[1] Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Hachioji, Tokyo

来源：

SOLID STATE COMMUNICATIONS | 1994年 / 92卷 / 06期

关键词：

A ORGANIC CRYSTALS; D HEAT CAPACITY; D PHASE TRANSITIONS;

D O I：

10.1016/0038-1098(94)90485-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The heat capacity of crystalline 4,4'''-difluoro-p-quaterphenyl was measured from 8 K to 303 K by adiabatic calorimetry. A broad anomaly was detected between 140 and 50 K and attributed to a sinrctural phase transition associated with molecular twisting. The temperature, the enthalpy and the entropy of transition were detemined as (200.5 +/- 0.5) K, (322 +/- 20) J mol-1 and (1.65 +/- 0.10) J.K-1.mol(-1), respectiveIy. The properties of the transition are compared with those of unsubstituted and fluorine-substituted p-polyphenyls (of two to four benzene rings in a molecule) in the Light of a unified model of displacive and order-disorder types of structural phase transition.

引用

页码：495 / 499

页数：5

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