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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Synthesis and properties of niobium barium phosphate glasses
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Synthesis and properties of niobium barium phosphate glasses

机译：磷酸铌钡玻璃的合成与性能

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摘要

Niobium barium phosphate glasses were prepared by melting different compositions of P2O5-Nb2O5-BaO-K2O in an induction furnace. Three routes of preparation were adopted: (a) the material was melted at 1300 degrees C, cast in a stainless steel mould and cooled to room temperature with a rod placed in contact with the upper surface of the liquid; (b) pound into the mould without the rod, (c) just removed from the furnace and cooled. Samples were prepared by varying the concentration of Nb2O5 from 0 to 40 mol%, BaO from 10 to 40 mol%, K2O from 5 to 30 mol% and maintaining 30 mol% of P2O5. X-ray diffraction and thermal analyses were performed to determine if these materials were amorphous, the temperature of the crystallization peak (635-780 degrees C) and the crystalline phase melting temperature (825-950 degrees C). The glass transition temperature for the sample P2O5 30 mol%, Nb2O5 30 mol%, BaO 30 mol% and K2O 10 mol% is 660 +/- 5 degrees C and the thermal expansion coefficient is (11.68 +/- 0.5)x 10(-6) C-1. The addition of BaO and consequently reduction of K2O increase the temperature of the crystallization peak from 662 degrees C to 838 degrees C. Most of the studied compositions are amorphous only if the liquid is quenched. The sample of composition previously mentioned did vitrify when cooled in a crucible withdrawn from the furnace. Optical transparent glasses were produced and absorption bands in the range of 400-2500 nm were not detected. Absorption increased monotonically at wavelengths less than 380 nm. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 13]
机译：磷酸铌钡玻璃是通过在感应炉中熔化不同组成的P2O5-Nb2O5-BaO-K2O制备的。采用三种制备方法：（a）将材料在1300℃下熔融，在不锈钢模具中浇铸，并通过与液体上表面接触的棒冷却至室温; （b）在没有棒的情况下将其捣入模具，（c）从炉中取出并冷却。通过将Nb2O5的浓度从0至40 mol％，BaO从10至40 mol％，K2O从5至30 mol％改变并保持30 mol％的P2O5的浓度来制备样品。进行X射线衍射和热分析以确定这些材料是否为无定形的，结晶峰的温度（635-780℃）和结晶相熔融温度（825-950℃）。样品P2O5 30 mol％，Nb2O5 30 mol％，BaO 30 mol％和K2O 10 mol％的玻璃化温度为660 +/- 5摄氏度，热膨胀系数为（11.68 +/- 0.5）x 10（ -6）C-1。 BaO的添加和因此K2O的减少使结晶峰的温度从662摄氏度增加到838摄氏度。大多数研究的组合物只有在液体淬灭后才是无定形的。当在从炉中取出的坩埚中冷却时，前述组合物样品确实玻璃化。制备光学透明玻璃，未检测到400-2500nm范围内的吸收带。在小于380 nm的波长处，吸收单调增加。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：13]

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