Resistivity at room temperature

Fig. 7. Impurity concentration vs resistivity at room temperature (34). These curves are for phosphoms and boron (p-type). Other Group 13 (IIIA)...

Tellurium is diamagnetic below its melting point. Its intrinsic electrical resistivity at room temperature is about 0.25 ohmcm, when the current is parallel to the i -axis, and decreases with increasing temperature and pressure. The element forms a continuous range of isomorphous solutions with selenium, consisting, in the soHd state, of chains of randomly alternating Se and Te atoms. 

Polyvinyl chloride Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) pipe and tubing are available in sizes 12 in and smaller for PVC and 4 in and smaller for CPVC. They have excellent resistance at room temperature to salts, ammonium hydroxide, and sulfuric, nitric, acetic, and hydrochloric acid but may be damaged by ketones, aromatics, and some chlorinated hydrocarbons. 

The total electrical resistance at room temperature includes tire contribution from scattering of conduction electrons by the vacancies as well as by ion-core and impurity scattering. If the experiment is repeated at a number of high temperarnre anneals, then the effects of temperarnre on tire vacancy conuibu-tion can be isolated, since the other two terms will be constant providing that... 

Acrylics are chemically resistant at room temperature to dilute acids, except hydrofluoric and hydrocyanic, all alkalis and mineral oils. They are attacked by chlorinated solvents, aromatic hydrocarbons, ketones, alcohols, ethers and esters [60]. 

FIGURE 19.6 Dependency on carbon black loading of perimeter distance between the nearest aggregates obtained from three-dimensional-transmission electron microscopic (3D-TEM) images (dp) and volume resistivity at room temperature (pv). (From Kohjiya, S., Kato, A., Suda, T., Shimanuki, J., and Ikeda, Y., Polymer, 47, 3298, 2006. With permission.)... 

Euln2P2 shows a rather low resistance at room temperature of 10 Q cm. The temperature dependence, shown in Pig. 11.4, is suggestive of a semi-metal. The resistivity decreases as a function of decreasing temperature until about 100 K, at which temperature it increases dramatically to a maximum coincident... 

Fig. 3 For 3 Ln, left temperature dependence of magnetic susceptibilities right impendence spectroscopy of the electrical resistances at room temperature...

The relationship between the temperature difference, AT, and the input power is shown in Fig. 4.5 for microhotplate simulations and measurements. The simulated values are plotted together with the mean value of the experimental data for a set of three hotplates of the same wafer. The experimental curve was fitted with a second-order polynomial according to Eq. (3.24). As a result of the curve fit, the thermal resistance at room temperature, tjo, is 5.8 °C/mW with a standard deviation of 0.2 °C/mW, which is mainly due to variations in the etching process. 

Chemical resistance at room temperature is generally good to limited versus oils, greases, aliphatic hydrocarbons and alcohols. 

Good ratios for cost versus mechanical and electrical properties fair creep resistance at room temperature low moisture absorption fair heat and cold behaviours moisture and hot-water resistances low shrinkage. 

Indium has one odd characteristic in that in the form of a sheet, like the metal tin, it will emit a shrieking sound when bent rapidly. Indium has some of the characteristics of other metals near it in the periodic table and may be thought of as an extension of the second series of the transition elements. Although it is corrosion-resistant at room temperature, it will oxidi2e at higher temperatures. It is soluble in acids, but not in alkalis or hot water. 

It is the scattering of conduction electrons by the lattice vibrations, phonons, which produces electrical resistance at room temperature. (At low temperatures, it is... 

Furan resins are produced by the polymerization of furfural or furfuryl alcohol in the presence of acids (see Figure 15.8). The properties of these dark-colored resins are shown in Table 15.6. Furan resins have a relatively low heat deflection temperature (80 °C) and good mechanical properties. These materials, which are widely used as jointing materials for brick and tile, are characterized by excellent resistance to nonoxidizing acids, alkalis, and salts but are affected by the presence of oxidizing acids such as nitric acid. The furan plastics are also resistant at room temperature to nonpolar solvents, such as benzene, and to polar solvents, such as ethanol. 

Table IV. Electrical Resistivity at Room Temperature Ternary ...

The effect of chain flexibility is also evidenced by replacing aromatic hardeners by aliphatic ones. This produces an increase in the fracture resistance at room temperature (Kinloch and Young, 1983). 

Some forty-eight years from the time the BCS theory was proposed, a large number of experimental evidence on superconductivity has accumulated. But, they do not seem to support the theory. Some obvious paradox is experimentally, the higher the resistivity at room temperature, the more likely that metal will be a superconductor when cooled. This directly contradicts the BCS s idea that paired electrons originate from fermi electrons. Further, if paired electrons (boson) indeed come from fermi electrons... 

The lattice resistance of the two crystal forms of AIN is not known. However, some tentative conclusions can be made by assuming that the lattice resistance at room temperature is close to the Peierls stress (Peierls, 1940), which agrees with experimental observations of a wide range of materials to within a factor of 3 and is given by... 

Procession of experimental data in the frame of this model (by least square root technique) yields the following expressions for the temperature dependence of the reduced resistance R/Rrt of the investigated salts (Rrt is the resistivity at room temperature) ... 

Fig. 5.50 Resistivity at room temperature as a function of oxygen pressure during sintering curve A, undoped BaTi0 85Zr015O3 curve B, (Ba0 85Ca0. i5Ofi.oHTio.9Zro.OO2. (After [24])...

---