Thermal properties of barium-borate glass containing iron in the temperature interval 300 to 700K

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The study of thermophysical properties of glasses containing transition metal oxide has received lately more attention. Glasses containing iron oxide were studied by Avogadro et aI. [1 ], Kinser [2], Mackenzie [3] and others [41 . The major objective of this work is to study the effect of composition and temperature on the thermal properties of barium-borate glasses containing different iron concentrations. Generally the thermal properties of glasses containing transition metal oxides were hardly studied. A homogeneous mixture of pure chemical powders was melted in an electric furnace at 1100 -+ 20 ° C for 2 h and then quenched in air to prepare a glass system according to the molar formula 75mo1% B203-(25-x) mol% BaOxmol% F%O3 where x = 0, 1, 2.5, 7.5 and 10. The samples were crushed into powder and pressed under a pressure of 13toncm -2. Discs ofO.013 m in diameter and 2 x 10-3m in thickness were obtained. For the simultaneous determination of thermal properties (Cp, X, a) a plane temperature waves method was used [5, 6]. The experimental errors of these properties did not exceed 3.5% for the specific heat capacity and thermal conductivity, and 3 to 6% for the thermal diffusivity measurement.