Glass Formation and Reddish Coloring Properties in Zinc Phosphotellurite Glass.
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Glass Formation and Reddish Coloring Properties in Zinc Phosphotellurite Glass. Tomoya Konishi1, Takaharu Hondo2, Tetsuo Araki2, Keishi Nishio2, Toshio Tsuchiya2, Takehisa Matsumoto1, Shigeru Suehara1, Shin-ichi Todoroki1, Satoru Inoue1 1 Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0047, JAPAN. 2 Faculty of Industrial Science and Technology, Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JAPAN. ABSTRACT Various compositions of P2O5-TeO2-ZnO glasses were prepared by using a combinatorial glass preparation system including a batch-preparing apparatus and a multi-sample casting machine, and the compositional dependence of glass forming tendency and thermal properties were intensively investigated. The samples exhibited a variety of colors, such as transparent, yellow, wine red and brown depending on its composition. Analyses with scanning electron microscopy and X-ray photoelectron spectroscopy revealed that the reddish coloration is responsible for colloidal suspension of nanometer sized elemental Te particles. INTRODUCTION Tellurite glasses and phosphotellurite glasses have drawn much attention as promising candidates for new glasses because they exhibit various unique or functional properties such as ionic conductivity [1], thermochromism based on a high thermal expansion rate [2], a high refractive index and dispersion [3-5], and so on. Especially, the low glass transition temperature (~400 ºC) is attractive for use in lead-free adhesive or soldering glasses [6], and coloration merely by heat treatment is advantageous for industrial production of colored glass [7]. Glass properties strongly depend on glass composition, so that it is important to determine the detail at every composition for practical application and materials design. However, such determination generally costs much time including tests on various compositions covering a wide compositional region. To improve the efficiency of the experiments, authors adopted combinatorial methodology including an automatic batch-preparing apparatus and a multi-sample glass-melting furnace driven by an automatic sequencer. The apparatus is capable of preparing ten samples at a time by batch melting and quench method. In this study the glass-forming region and the compositional dependency in glass transition temperature and coloring properties were investigated for the P2O5-TeO2-ZnO (PTZ) system.
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EXPERIMENTAL Samples in the PTZ system were prepared with the compositions annotated in figure 1 (a). The batch for each composition was prepared from reagent-grade H3PO4, TeO2 and ZnO with the automatic batch preparation apparatus which is described in the literature [8]. The batches were melted and quenched automatically with combinatorial glass preparation apparatus, which can handle ten samples at a time [8]. The batches in alumina crucibles were melted at 900, 1000, 1100 or 1100 ºC for 20 min to attain uniform melts. The m
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