Electrical properties of Bi80Sb20 alloy thin films, vacuum-deposited at different substrate temperatures

Thickness dependence of electrical resistivity and activation energy in AgSbTe2 thin films

Abstract: Thin films of AgSbTe2 with different thicknesses were prepared by thermal evaporation on glass substrates held at room temperature. The films were all found to be semiconducting in nature. The film resistivity was found to be a function of inverse thickness and was discussed on the basis of the effective mean free path model. The activation energy was found to be a linear function of the inverse square of film thickness. It was attributed to the quantization of the momentum component of charge carriers normal to the film plane.

Electrodeposition of Bi-Sb Alloy Using Cu electrodes

Abstract: Bi-Sb alloys were grown by means of an electrodeposition method using Cu electrodes. The alloys were studied with the help of an x-ray diffractometer and an electron probe microanalysis. The both investigations have shown no trace of Cu in the obtained alloys. It can be concluded that Cu electrodes can be used for the deposition of Bi-Sb alloys; which results in an advantage of availability of the electrode.

Effect of Thermal Annealing on the Characteristics of Bi-Sb Thin Film Structure

Abstract: In this study, Bi-Sb thin film structure was prepared by thermal evaporation method. The electrical, optical transmission and structural characteristics of the prepared samples were introduced before and after thermal annealing process. At temperature of 500 °C, the absorption of the structure was improved to reach 97% at near-infrared region. As well, the thermal annealing caused to reduce the bulk resistance of the Bi-Sb thin film structure. The mor-phology of Bi-Sb structure was also improved by thermal annealing as characteristic islands of the structure appear clearly in form hexagonal areas distinct from each other. This study is aiming to examine such structures if they are employed as photonic devices such as photodetectors, LED’s and optical switches.

Effect of operating temperature on performance of obliquely deposited Bi, Sb, and Bi-Sb semimetal thin film laser detectors

Abstract: Obliquely deposited (70/spl deg/) Bi, Sb, and Bi-Sb alloy thin films have been prepared by thermal resistive technique. Structural properties of these films were studied using XRD. Their resistance and voltage responsivity for Nd:YAG and CO/sub 2/ laser pulses have been recorded as function of operating temperature between 10/spl deg/C and 120/spl deg/C. It was found that the maximum responsivity for these detectors can be obtained at 75/spl deg/C. On the other hand, the dependence of responsivity on the width of detectors was investigated.

A handbook of lattice spacings and structures of metals and alloys

Abstract: For the best product experience, a Handbook of of argumentative essay structure spacing Lattice Spacings and Structures of Metals and Alloys ScienceDirect. Get this from a library! A handbook of lattice spacings and structures of metals and alloys. (W B Pearson) Acm metal). Vol. lattice plane model modified by the incorporation of thermodynamic functions appropriate to the f.c.c. Al—Ag solid zones in the alloys. W. B. Pearson, Handbook of Lattice Spacings. Structures of Metals and Alloys.

Temperature Dependence of the Electrical Properties of Bismuth-Antimony Alloys

Abstract: The electrical resistivity $\ensuremath{\rho}$ and Hall effect $R$ of zone-levelled single crystals of Bi-Sb alloys have been measured in the temperature range from 4.2\ifmmode^\circ\else\textdegree\fi{}K to 300\ifmmode^\circ\else\textdegree\fi{}K. $\mathrm{Log}(\frac{\ensuremath{\rho}}{{\ensuremath{\rho}}_{300}})$ vs $\frac{1}{T}$ curves suggest thermal activation of carriers in the concentration range from 5% to 40% Sb in the temperature range from 25\ifmmode^\circ\else\textdegree\fi{}K to 100\ifmmode^\circ\else\textdegree\fi{}K; approximate activation energies have been inferred from their slopes. The activation energy appears to have a maximum at a concentration near 12%. Some anomalies have been observed in the behavior of $\ensuremath{\rho}$ and $R$ on both sides of this concentration at low temperatures. Lattice parameters for these alloys have also been measured for the entire range of solid solubility. Both a maximum and minimum in the $c$-axis lattice parameter vs concentration occur near the concentration at which anomalies appear in transport properties. These phenomena are discussed in terms of a simple band model proposed by Blount and Cohen.

Effect of External Current on the Magnetization of Non-Ideal Type II Superconductors

Abstract: The influence of the external current on the magnetization of non-ideal type II superconductors is explained. It is shown how in the mixed state the external current brings about a particular state of the critical distribution of flux threads allowing a finite total transport current. In the case where the external current is perpendicular to the external magnetic field, the reduction of the magnetization due to the external current and its dependence on the history of the application of current and field are explained quantitatively in Nb-Zr(25%) alloy. The transverve paramagnetic effect observed by LeBlanc is also discussed.