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

IF 1.8 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR Russian Journal of Inorganic Chemistry Pub Date : 2024-08-23 DOI:10.1134/s0036023624601107

A. V. Egorysheva, S. V. Golodukhina, K. R. Plukchi, L. S. Razvorotneva, A. V. Khoroshilov, O. G. Ellert

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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 LaNi_1/3Sb_5/3O₆, 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 LaCo_1/3Sb_5/3O₆, 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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La2O3-(Ni/Со)O-Sb2O5 体系的固相下平衡

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。

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来源期刊

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.