TTF-TCNQ的晶体完美和物理特性,Annals of the New York Academy of Sciences

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TTF-TCNQ的晶体完美和物理特性
Annals of the New York Academy of Sciences ( IF 4.1 ) Pub Date : 1978-09-01 , DOI: 10.1111/j.1749-6632.1978.tb39425.x
Lawrence B. Coleman

四硫富瓦烯四氰基醌二甲烷 (TTF-TCNQ) 的直流电导率的温度依赖性和绝对值是该化合物研究最详尽的特性。它们也是最具争议的，因为活跃在该领域的许多研究小组报告了广泛的结果。这场争论源于两个实验不确定性来源。第一个是本演示文稿的主题，是从样品到样品（以及实验室到实验室）的不同水平的晶体完美度。第二个问题是众所周知的测量高度各向异性材料的电导率固有的困难。文献中详细讨论了'-'这个问题，这里就不讨论了。？核心问题是，TTF-TCNQ 的固有直流电导率是多少？室温电导率测量值在 100 到 1000 (Q-cm)-' 之间，电导率随温度变化的分布如图 1 和图 2 所示。我们认为这种不同的行为是由于从样品到样品的晶体完美（化学和结构）。由于尚未生产出完美的 TTF-TCNQ 晶体，我们必须首先探索缺陷的影响，然后使用此信息从测量值中提取电导率来确定本征电导率。为此，发起了两管齐下的攻击。首先，努力生产更高质量的样品，通过对 TTF-TCNQ 结晶的研究，在化学上（这项工作在之前的演讲中有所报道）和物理上，这导致了晶体生长的模型以及更大、更完美的单晶的生产。其次，使用各种宏观晶体完美度和纯度的样品进行电导率研究，以阐明它们对电导率的影响。

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CRYSTAL PERFECTION AND THE PHYSICAL PROPERTIES OF TTF-TCNQ

The temperature dependence and absolute value of the dc conductivity of tetrathiofulvalene tetracyanoquinodimethan (TTF-TCNQ) have been the most exhaustively studied properties of this compound. They have also been the most controversial, because of the wide range of results reported by the many research groups active in the field. This controversy sprung from two sources of experimental uncertainty. The first, which is the subject of this presentation, is the variable level of crystal perfection from sample to sample (and laboratory to laboratory). The second problem is the well-known difficulty inherent in measuring the conductivity of highly anisotropic materials. Discussed a t length in the literature,’-’the problem will not be discussed here.? The central question is, what is the intrinsic dc conductivity of TTF-TCNQ? Room-temperature conductivities have been measured between 100 and 1000 (Q-cm)-’, and the spread in the temperature dependence of the conductivity is demonstrated in FIGURES 1 and 2. We maintain that this varied behavior is due to widely different levels of crystal perfection (both chemical and structural) from sample to sample. Because the perfect crystal of TTF-TCNQ has yet to be produced, we must determine the intrinsic conductivity by first exploring the effects of imperfection and then using this information to extract the conductivity from the measured values. To accomplish this, a two-pronged attack was launched. First, an effort was made to produce higher quality samples, both chemically (this effort is reported on in the previous talk6) and physically by an investigation of the crystallization of TTF-TCNQ, which led to a model of the crystal growth and the production of larger and more perfect single crystals. Secondly, conductivity studies using samples of various levels of macroscopic crystal perfection and purity were made, to elucidate their effects on the conductivity.

更新日期：1978-09-01

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