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

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 (σ a = 3.63×10 4 S/cm, σ b = 2.84×10 6 S/cm, and σ c = 1.82×10 5 S/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.

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