Anisotropic electrical conductivity, phase transition and thermal hysteresis of a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane DBA(TCNQ)2

• 来源期刊: 中国物理B(英文版)
• 关键词: organic crystals charge-transfer salt conductivity anisotropy
• 年，卷（期）: 2008,（6）
• 页码范围: 2251-2256
• 页数: 6页
• 语种: 英文

摘要

This paper reports that a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane [DBA (TCNQ)2] has been prepared. The temperature dependences of the DC electrical conductivity of the DBA (TCNQ)2 single crystal measured along the crystallographic a, b, and c axes are reported. The crystal shows semiconducting be- haviour and the room-temperature conductivities are highly anisotropic (σa = 3.63×10-4S/cm, σb= 2.84×10-6S/cm, and σc = 1.82×10-5S/cm). Particularly, a sharp semiconductor to semiconductor transition has been observed around 270 K on the resistivity curves measured under cooling and heating. In addition, thermal hysteresis phenomena on conductivity and differential scanning calorimetry curves are also reported.