One-dimensional electrical conductors

Band structure cesium auride, 25 240-241 graphite-alkali metal compounds, 23 287 Band theory, for one-dimensional electrical Conductors, 26 237-241 Barbituric acid, 18 187 Barium... 

One-dimensional electrical conductors, platinum complexes, 26 235-268 band theory, 26 237-241 charge density waves, 26 239-240 Kahn-Teller effect, 26 239-240 and superconductivity, 26 240-241 One-electron reactions, oxo-molybdenum centers, 40 56-57... 

Pt(II) compound reactivation, 37 201 Pt(IV) compound reduction, 37 201 rate-determining step, 37 199-201 tetrachloride, 4 187-188 tetracyanide anions, as one-dimensional electrical conductors, 26 235-268 anion-deficient structures anhydrous compounds, 26 252-254 dimerization, 26 249-251 hydrated derivatives, 26 245-252 physics, 26 260-263 with potassium bromide, 26 248-249 with rubidium chloride, 26 249-250 cation-deficient compounds, 26 244, 254-256... 

Since then, the metal derivatives that have been studied include Mo and Cr complexes which have been electrochemically investigated by Murakami et al. [47, 48] during their studies on one-dimensional electric conductors and, more recently, a detailed study of the electrochemistry of Co3+ and Rh3+ has been reported [49]. 

The poor solubility of dimethyl-glyoxime complexes has always restricted study of their interesting physical properties (crystalline Ni(dmgH)2is a familiar red gravimetric precipitate as well as a one-dimensional electrical conductor). We have reported the synthesis of a series of freely soluble carbocyclic bis-dioxime complexes of structural types 1 to 4. 

Using the value of xo. the temperature dependence of the energy gap, Aeff(T), was determined from the experimental values using this expression (Fig. 9.20). It shows qualitatively the same temperature dependence as was found from the temperature dependence of the specific electrical conductivity (cf Fig. 9.16a). In particular, it exhibits the effective band gap above the Peierls transition, which is caused by the fluctuations of the one-dimensional CDW conductor and has the result that even above the Peierls transition, no genuine metallic conductivity is present. 

Compared with technical glasses the electrical resistivity of Zerodur is rather poor. The temperature for a resistivity of 10 Qcm is 178 °C. The dielectric constant e and the loss factor tan 5 at 1 MHz are 7.4 and 0.015, respectively. These data are not surprising. /3-eucryptite, a crystalline material with the special h-quartz s.s. composition Li20 AI2O3 2Si02, is known to be a good one-dimensional ion conductor [4.21], and due to the structure of h-quartz also other solid solution compositions are expected to behave similarly. So, neither the residual glass phase nor the crystalline phase are expected to block ionic conductivity effectively. 

One-dimensional inorganic platinum-chain electrical conductors. J. M. Williams, Adv. Inorg. Chem. Radiochem., 1983,26,235-268 (107). 

Figure 6.8 One dimensional schematic representation of the energy momentum curve for seven electrons in a conductor with (a) no applied electric field and (b) an applied electric field. Reprinted, by permission, from L. Solymar, and D. Walsh, Lectures on the Electrical Properties of Materials, 5th ed., p. 427. Copyright 1993 by Oxford University Press.

Finally, it may be remarked that the two salts MEM(TCNQ)2 and TEA(TCNQ)2 bear several points of resemblance in their physical properties with the most interesting salts of the (TMTTF)2X series (TMTTF = tetramethyltetrathiafulvalene) [14]. They are all organic conductors with a quasi-one-dimensional character, with p = 5 (or ), and with a dominant electron-electron interaction. They exhibit comparable modest values of the electrical conductivity at high temperature, which indicate that the electrons are not very delocalized in the materials, and in all of them an underlying 4kF dimerization is also present, due to the cations. These common features, which are thought to be at the origin of sizable Umklapp scattering effects in the salts of the (TMTTF)2 series [14], could also be able to produce the same kinds of effects in MEM(TCNQ)2 and TEA(TCNQ)2 (see also Chapter 2). 

As shown in Section II, this field has expanded enormously in less than 10 years since the first conductive LB film was reported in 1985 [20]. During this time, the research has shifted from one-dimensional conductors to two-three-dimensional conductors. The reason is clear Due to the small amount of material involved in an LB film, it is crucial to deal with a highly conductive material if precise conductivity measurements are to be made to elucidate the electrical properties of the material. In this regard, two-and three-dimensional conductors have an advantage over one-dimensional conductors when considered for use as the active parts of the conductive LB films since two- and three-dimensional conductors seem to be relatively insensitive to the defects and disorders present in conductive LB films compared with one-dimensional conductors. 

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