Abstract
Thermal analysis was carried out for binary and ternary mixtures of salts, Na2B4O7, BaCl2 and NaCl. For the mixtures containing borax less than 35M%, cooling and heating curves were obtained by an ordinary method of thermal analysis, while for those containing borax more than the same percentage, heating curves only were taken with cylindrical specimens, which were prepared by melting the salt mixtures and solidifying them as glass state, followed by changing them to crystal state by heating at 600° for several hours. The powdered crystalline mixtures were pressed to cylinder, 10mm in diameter and 15mm in length. In the binary equilibrium diagram of the Na2B4O7-BaCl2 system a compound, Na2B4O7·BaCl2, which decomposes into two insoluble liquid phases on heating at 899° is formed, and this forms eutectics with Na2B4O7 and BaCl2, at points 645°, 27·5M% Na2B4O7, and 670°, 77·5M% Na2B4O7, respectively. From the results of the thermal analysis for 69 ternary mixtures, several isothermal and sectional diagrams, and a projectional diagram of the space model of this ternary system were constructed. There are two ternary eutectic points, 640° (17M% Na2B4O7, 48M% BaCl2: 35M% NaCl) and 642° (64M% Na2B4O7, 11M% BaCl2, 25M% NaCl) in this system. The two liquid reaction surface spreads out on the liquidus surface of the compound, Na2B4O7•BaCl2.
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