La2O3-(Ni/Со)O-Sb2O5 体系的固相下平衡

IF 1.8 3区 化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR
A. V. Egorysheva, S. V. Golodukhina, K. R. Plukchi, L. S. Razvorotneva, A. V. Khoroshilov, O. G. Ellert
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引用次数: 0

摘要

摘要 研究了 La2O3-(Ni/Со)O-Sb2O5 体系中的固相平衡。发现 La2O3-Sb2O5 体系中存在一种以前未知的化合物 La4Sb2O11。研究表明,La4Sb2O11 在 1060°C 下分解生成 La3SbO7 和 LaSbO4。在 La2O3-NiO-Sb2O5 体系中发现了两种三元氧化物(LaNi2SbO6 和 La2NiSb2O9)。这些新化合物非常稳定,在整个研究温度范围(25-1350°C)内都不会发生多晶型转变。之前已知的三元氧化物,即透辉石 La3Ni2SbO9 和蔷薇石 LaNi1/3Sb5/3O6 的存在已得到验证。在 La2O3-CoO-Sb2O5 体系中,发现了两种新化合物(LaCo2SbO6 和 La2CoSb2O9),以及之前已知的透辉石 La3Co2SbO9、蔷薇石 LaCo1/3Sb5/3O6 和斜方热长石 La3Co2Sb3O14。这些新化合物与镍氧化物体系中的化合物结构相同。与镍类似物不同,La2CoSb2O9 会在 990°C 分解。至于 LaCo2SbO6,在高达 1350°C 的 DSC 曲线上没有检测到与多晶型转变或熔化有关的热事件。对新合成的 LaNi2SbO6、La2NiSb2O9、LaCo2SbO6 和 La2CoSb2O9 相的漫反射光谱的检测表明,其中镍和钴的氧化态为 2+。构建了 La2O3-(Ni/Co)O-Sb2O5 体系的 1050°C 等温截面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Subsolidus Phase Equilibria in the La2O3–(Ni/Со)O–Sb2O5 Systems

Subsolidus Phase Equilibria in the La2O3–(Ni/Со)O–Sb2O5 Systems

Abstract

Subsolidus phase equilibria in the La2O3–(Ni/Со)O–Sb2O5 systems have been studied. A previously unknown compound La4Sb2O11 was found to exist in the La2O3–Sb2O5 system. La4Sb2O11 has been shown to decompose at 1060°C to form La3SbO7 and LaSbO4. Two ternary oxides (LaNi2SbO6 and La2NiSb2O9) have been discovered in the La2O3–NiO–Sb2O5 system. These new compounds are stable and do not undergo polymorphic transformations throughout the range of temperatures studied (25–1350°C). The existence of previously known ternary oxides, namely perovskite La3Ni2SbO9 and rosiaite LaNi1/3Sb5/3O6, has been verified. In the La2O3–CoO–Sb2O5 system, two new compounds (LaCo2SbO6 and La2CoSb2O9) have been found along with previously known perovskite La3Co2SbO9, rosiaite LaCo1/3Sb5/3O6, and rhombohedral pyrochlore La3Co2Sb3O14. These new compounds are isostructural to those found in the nickel oxide system. La2CoSb2O9, unlike its nickel analogue, decomposes at 990°C. For LaCo2SbO6, no thermal events associated with polymorphic transitions or melting have been detected on DSC curves up to 1350°C. An inspection of diffuse reflectance spectra of the newly synthesized LaNi2SbO6, La2NiSb2O9, LaCo2SbO6, and La2CoSb2O9 phases showed that the oxidation state of nickel and cobalt in them is 2+. The 1050°C isothermal sections of La2O3–(Ni/Co)O–Sb2O5 systems have been constructed.

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来源期刊
Russian Journal of Inorganic Chemistry
Russian Journal of Inorganic Chemistry 化学-无机化学与核化学
CiteScore
3.10
自引率
38.10%
发文量
237
审稿时长
3 months
期刊介绍: Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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