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    Determination of Nucleation Kinetics of Ammonium Biborate Tetrahydrate
    (CHIMINFORM DATA S A, 2014) Sahin, Omer; Ozdemir, Mustafa; Izgp, M. Sait; Demir, Halil; Ceyhan, Ayhan Abdullah
    The ammonium biborate tetrahydrate was synthesized by stoichiometric incorporation of boric acid and ammonium hydroxide in aqueous solution and the effects of supersaturation, temperature, pH of solution, cooling rate and presence of impurities upon the metastable zone width (MZW) were investigated. The MZW of ammonium biborate tetrahydrate aqueous solution was increased with increasing concentration of impurities. The saturation temperature was increased in the presence of Ca (II) ion and decreased in the presence of Pb(II) and Mg (II) ions.
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    The investigation of thermal decomposition kinetics of potassium tetraborate tetrahydrate by thermal analysis
    (Selçuk Üniversitesi Mühendislik-Mimarlık Fakültesi, 2009) Ceyhan, A. Abdullah; Demir, Halil; Şahin, Ömer
    The thermal decomposition of potassium tetraborate tetrahydrate to potassium tetraborate were studied by using the traditional criterion of the mathematical fitting of g(?) function  and model free linear isoconversional methods. The nonisothermal kinetic triplet (f(?), A and E) obtained by model fitting method for potassium tetraborate tetrahydrate can be represented by different kinetic model, but the apparent activation energy is far from each other. The complex nature of the multi?step process of the studied compounds was more easily revealed using a wider temperature range in nonisothermal isoconversional method.