络合铝酸盐Dy2SrAl2O7的形成及热稳定性

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, CERAMICS
V. F. Popova, V. L. Ugolkov, E. A. Tugova
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引用次数: 0

摘要

研究了复合铝酸盐Dy2SrAl2O7的形成条件和工艺。确定了固态合成Dy2SrAl2O7是通过形成铝酸锶SrAl2O4进行的。当温度高于1200℃时,中间化合物SrAl2O4和Dy2O3之间开始积极相互作用,二维非自治相SrAl2O4转变为类液态。首次表征了Dy2SrAl2O7在1750°С不均匀熔点前的热稳定性。实验测定了Dy2SrAl2O7在400 ~ 1300°С温度范围内的热膨胀系数(CTE)为8 × 10-6 K-1。结果表明,在1300°С时,Dy2SrAl2O7的活性烧结开始。在Ln2SrAl2O7系列中显示了熔化图类型的变化,其中Ln = La→Gd→Dy, Ho。Ln2SrAl2O7系列(Ln = La→Ho)的熔点温度和CTE值均有所下降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Formation and Thermal Stability of the Complex Aluminate Dy2SrAl2O7

Formation and Thermal Stability of the Complex Aluminate Dy2SrAl2O7

The formation conditions and processes of the complex aluminate Dy2SrAl2O7 are studied. It is established that solid-state synthesis of Dy2SrAl2O7 proceeds through the formation of strontium aluminate SrAl2O4. At temperatures above 1200°C, active interaction begins between the intermediate compound SrAl2O4 and Dy2O3, associated with the transition of the two-dimensional nonautonomous phase SrAl2O4 into a liquid-like state. The thermal stability of Dy2SrAl2O7 up to the temperature of incongruent melting at 1750°С is characterized for the first time. The coefficient of thermal expansion (CTE) of Dy2SrAl2O7 is experimentally determined to be 8 × 10–6 K–1 in the temperature range of 400–1300°С. It is shown that active sintering of Dy2SrAl2O7 begins at 1300°С. A change in the type of melting diagrams is shown in the Ln2SrAl2O7 series, where Ln = La → Gd → Dy, Ho. A decrease in both melting temperatures and CTE values is revealed across the Ln2SrAl2O7 series (Ln = La → Ho).

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来源期刊
Glass Physics and Chemistry
Glass Physics and Chemistry 工程技术-材料科学:硅酸盐
CiteScore
1.20
自引率
14.30%
发文量
46
审稿时长
6-12 weeks
期刊介绍: Glass Physics and Chemistry presents results of research on the inorganic and physical chemistry of glass, ceramics, nanoparticles, nanocomposites, and high-temperature oxides and coatings. The journal welcomes manuscripts from all countries in the English or Russian language.
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