Temperature dependence of the electrical conductivity

Since the measured conductivity showed Arrhenius-type temperature dependence at temperatures above T, the apparent activation energy of the electrical conductivity, was calculated by the Arrhenius equation as follows  

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Lithium triflate was the most used salt and the temperature dependence of the electrical conductivity of a series of (LiS03CF3)x/MEEP complexes with a ratio metal cation/MEEP repeat unit 0.125[Pg.203]

Nakajima, T., and K. Torii Temperature dependence of the electrical conductivity of nylon. Rep. Prog. Polymer Phys., Japan 5, 209 (1962). 

The temperature dependence of the electrical conductivity of KCP(Br) has been studied by Zeller and Beck (Figure 4).37 At room temperature, try is about 300 2-1 cm-1 and the dependence of conductivity on temperature is slightly negative with the degree of anisotropy ffg/ffi of about 105. 

All samples show Na2S0 -]H phase together with SiC. The typical phase transformation from I to HI at 513 K was observed from the measurement. The mixing of SiO- alone into sodium sulfate cannot suppress the I to HI transition. The temperature dependences of the electrical conductivity for the Na2S0,-Si02 systems are shown in Figure 2. The addition of SiC into Na2S0, does not enhance the conductivity. 

Temperature dependence of the electrical conductivity for perovskite-type solid solutions hydrogen. 1. StCCqYbon303 f3. 2. SrCeQ YQjO 3. SrCeQ Sc Q O From ref. [55]. 

Fig 4. Temperature dependence of the electric conductivity of [N-CH3-Pz](TCNQ) compound. 

FIG. 11.20 Temperature dependence of the electrical conductivity of c/s-polyacetylene at various doping levels. From Roth (1987). Courtesy Trans Tech Publications. 

The room-temperature conductivity of the PPN polymer was 0.2 S/cm without doping, a value almost in the middle of those of polyacetylene and graphite. The temperature dependence of the electrical conductivity was measured with the PPN whiskers synthesized at various HTT s. The measured o - T curves were fitted to m-dimensional VRH equations ... 

The shape of the temperature dependence of the electrical conductivity depends on the system to be investigated. In general, it can be expressed in two ways. Either it is the polynomial equation... 

Figure 4.16 Temperature dependence of the electrical conductivity determined for epitaxial YSZ thin films with different thicknesses [272].

Fig. 2 Temperature dependence of the electrical conductivity of the TMBP.HCNB complex. Empty circles - microwave conductivity, full circles - d.c. measurements...

Fia. 31. The temperature dependence of the electrical conductivity of chromia at the following conditions (1) oxidized sample in air (2) oxidized sample at 10 Ton-oxygen pressure (3) reduced sample in air (4) reduced sample in 20 Torr of carbon monoxide and (5) reduced sample in 20 Torr of hydrogen (19). 

The most advanced SOFC s employ oxide ion conducting zirconia-based electrolytes. The conductivity of the electrolyte determines their operation temperature. The temperature dependence of the electrical conductivity for zirconia-hased oxides [12] is shown in Fig. 2. 

Figure 2. Temperature dependence of the electrical conductivity determinedfor nanocrystalline thin film and microcrystalline bulk YSZ. The insert shows the SEM images of...

Fig. 9.2 The temperature dependence of the electrical conductivity (j of highly-conducting TCNQ salts along the stacking axis. TCNQ is in each case the acceptor TTF, NMP, and the alkali atoms are donors. The meanings of the abbreviations are given in Fig. 9.12. The three classes 1, 2, and 3 are explained in the text. After [5] and [Ml, p. 592].

Fig. 9.6 The temperature dependence of the electrical conductivity a = en t. The maximum of the conductivity in crystals of class 2 is found from the charge-carrier concentration n oce (fg js the band...

Fig. 9.15 The temperature dependence of the electrical conductivity a of variously deuterated single crystals of (2,5-dimethyl-DCNQI)2 Cu. One can see the strong effects of even small variations in the crystal parameters. Only the crystals with deuterated methyl groups undergo a Peierls transition. The crystals a and b, in contrast, remain metallic conductors down to the lowest temperatures. From [16].

D Ep) is the density of states at the Fermi energy. Eq. (9.18) describes the known temperature dependence of the electrical conductivity of a metal at high temperatures a ocJ". ... 

The first subhalide which was investigated by measurement of the electrical conductivity was tellmium monoiodide with a 1.1 eV band gap calculated from the temperature dependence of the electrical conductivity After the crystal structure determination of tellurium subhalides had shown these compounds to be modified tellurimn structures (see IV), systematic investigations of their electrical conductivities were undertaken Electrical contact with subhalide crystals was... 

The temperature dependence of the electrical conductivity of the resulting composites is presented in Figure 3-15. Figure 3-15a illustrates the metallic behavior observed as function of Ni/ceria ratios when the composites... 

It is quite clear that one wants to avoid a metal-to-insulator transition if one wants to ultimately stabilize an organic superconductor. Nevertheless, most organic conductors do undergo a Peierls transition. The temperature dependence of the electrical conductivity of TTF-TCNQ (Fig. 9) is prototypical for the class of organic metals [1,2]. 

Fig. 3. Temperature dependences of the electrical conductivity and the thermoelectric power of alloys (46 to 47.25 wt.% Si), a) MnSii sj b) MnSij c) MnSii.jj d) MnSii T5 (MD4SiT).

A study of the temperature dependence of the electrical conductivity, thermoelectric power, and thermal conductivity (F. 3,4) clearly confirms the semiconducting nature of the higher manganese silicide and alloys with similar compositions. The thermal width of the forbidden band is 0.5 0.15 eV. 

The temperature dependences of the electrical conductivity, the thermoelectric power, and the magnetic susceptibility of sintered samples of tin dioxide, doped with antimony and zinc oxides, were measured in air in the 20-1300°C temperature range. At attempt is made, on the basis of these measurements, to explain the changes In the above properties, in samples of different composition, by a change in the valence of the added Impurity. 

Fig. 1. Temperature dependence of the electrical conductivity (in this and the other figures, the curve number corresponds to the composition number).

The curve of the temperature dependence of the electrical conductivity of pure SnOj between 350 and TOO C has a slqpe of 1.85 eV (cf. Fig. 1), vdiich is consistent with the assunq>tion of a deep-lying donor level. 

The picture may be complicated by partial transitions of electrons from the level to the level to form deeper states. This may e mlain, in particular, the virtually complete absence of a temperature dependence of the electrical conductivity for an alloy with 2% NdSe. 

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