องค์ประกอบทางเคมีและโครงสร้างผลึกของแร่ในจังหวัดเลย

Abstract

Chemical composition and crystal structure of mineral samples were analyzed by X-ray fluorescence spectrometer (XRF) and X-ray diffractometer (XRD). The study of it thermoelectric properties at room temperature included type of charge carrier, electrical resistivity, and thermal conductivity. The charge carriers and Seebeck coefficient, were determined using the hot probe method. The electrical resistivity was measured by the four point probe method. The steady state technique is used to find the thermal conductivity. XRF results found the mineral samples comprise SiO₂-Al₂O₃-P₂O₅-CaO-SO₃-MgO-K₂O and BaO-K₂O-SiO₂-CaO-P₂O₅. XRD results expected the SiO₂, CaO, SO₃, BaO, K₂O and P₂O₅ phase. The properties measurement of BaO-K₂O-SiO₂-CaO-P₂O₅ found that it exhibited n-type conduction. Seebeck coefficient was equal to 61.90±2.60 mV/K. Electrical resistivity decreased with increasing electric power and temperature. Thermal conductivity value was around 215.56±33.43 W/m×K. These studies can be used as an important platform for further research.