Anisotropic electrical conductivity,phase transition and thermal hysteresis of a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane DBA(TCNQ)2
Long Yun-Ze(龙云泽)a)†, Chen Zhao-Jia(陈兆甲)b), Peng Hai-Lin(彭海琳)c), and Liu Zhong-Fan(刘忠范)c)
aCollege of Physics Science, Qingdao University, Qingdao 266071, China; bBeijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; cCenter for Nanoscale Science and Technology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
Abstract 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 behaviour and the room-temperature conductivities are highly anisotropic ($\sigma_{a}=3.63\times10^{-4}$ S/cm, $\sigma_{b}=2.84\times10^{-6}$S/cm, and $\sigma_{c}=1.82\times10^{-5}$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.
Received: 29 October 2007
Revised: 29 November 2007
Accepted manuscript online:
PACS:
72.20.Jv
(Charge carriers: generation, recombination, lifetime, and trapping)
Fund: Project
supported by the National Natural Science Foundation of China (Grant
No 10604038) and the Program for New Century Excellent Talents
in University (NCET-2007).
Cite this article:
Long Yun-Ze(龙云泽), Chen Zhao-Jia(陈兆甲), Peng Hai-Lin(彭海琳), and Liu Zhong-Fan(刘忠范) Anisotropic electrical conductivity,phase transition and thermal hysteresis of a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane DBA(TCNQ)2 2008 Chin. Phys. B 17 2251
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