Aydin, Cihat; Aydin, Handan; Yakuphanoglu, Fahrettin

In this study, X-ray diffraction, electrical conductivity, optical and dielectrical properties of the InTe amorphous semiconductor material have been investigated. X-ray diffraction results show that InTe sample has an amorphous structure. Temperature dependence of electrical conductivity of the sample has been investigated and the obtained results confirm that InTe is an amorphous semiconductor. The InTe sample shows photoconductivity behavior. The optical band gap and optical constants of the sample were calculated using transmittance and reflectance spectra. In the sample, the direct optical transitions take place The refractive index dispersion curve of the sample obeys the single oscillator model. The dielectrical properties of the sample have been investigated as a function of frequency and temperature. It was found that the dielectrical parameters were changed with temperature and frequency. The electrical modulus curves were used to analyze the dielectrical relaxation processes.

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Karacahan, Mehmet Kayra; Demirkiran, Nizamettin; Turhan Özdemir, G.Deniz

Ulexite is commercially one of important boron minerals, and it is found abundantly in Turkey. Ulexite is generally available together with other borates, and it can be used as a raw material in the production of boron compounds. It includes a significant amount of hydration water. When ulexite is subjected a dehydration process, it loses some part of hydrate water depending upon applied temperature. A porous solid is obtained in consequence of dehydration treatment, and the solid material becomes more chemically active. The resulting porous structure allows occurring more readily the reaction between solid and fluid, and the dissolution rate increases. In this study, the dissolution kinetics of calcined ulexite in ammonium sulfate solutions was examined. In the experiments, the effects of the dehydration temperature, solution concentration, reaction temperature, solid-to-liquid ratio, and stirring speed on

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