HoBaCo2O6-δ的相行为和缺陷结构

IF 3.1 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Inorganics Pub Date : 2023-09-05 DOI:10.3390/inorganics11090361

R. E. Yagovitin, D. Tsvetkov, I. Ivanov, D. Malyshkin, V. Sereda, A. Zuev

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引用次数: 0

摘要

差示扫描量热法研究表明，双钙钛矿HoBaCo2O6-δ（HBC）根据其氧含量，在298–773K的温度范围内经历三次相变。使用相关文献数据初步解释了它们的起源。对于单相四方HBC，在573–773K的中间温度范围内，通过热重分析和流动反应器方法研究了氧非化学计量法对氧分压的依赖性。使用所获得的HBC氧非化学测量数据与先前报道的数据相结合，成功地验证了所提出的HBC的缺陷结构。因此，确定了HBC中进行的缺陷反应的热力学参数值（∆Hi∘，∆Si \8728）。HBC的缺陷结构与YBaCo2O6-δ（YBC）的缺陷结构相似，可能是由于Ho3+和Y3+的离子半径相似。

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Phase Behavior and Defect Structure of HoBaCo2O6-δ

The differential scanning calorimetry study showed that the double perovskite HoBaCo2O6-δ (HBC), depending on its oxygen content, undergoes three phase transitions in the temperature range 298–773 K. Their origin was tentatively explained using the relevant literature data. For the single-phase tetragonal HBC, the oxygen nonstoichiometry dependences on the oxygen partial pressure were investigated by thermogravimetric and flow reactor methods in the intermediate-temperature range of 573–773 K. The proposed defect structure of HBC was successfully verified using the obtained data on its oxygen nonstoichiometry combined with those reported earlier. As a result, the values of the thermodynamic parameters (∆Hi∘, ∆Si∘) of the defect reactions proceeding in HBC were determined. The defect structure of HBC was shown to be similar to that of YBaCo2O6-δ (YBC) likely due to similar ionic radii of Ho3+ and Y3+.

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来源期刊

Inorganics Chemistry-Inorganic Chemistry

CiteScore

2.80

自引率

10.30%

发文量

193

审稿时长

6 weeks

期刊介绍： Inorganics is an open access journal that covers all aspects of inorganic chemistry research. Topics include but are not limited to: synthesis and characterization of inorganic compounds, complexes and materials structure and bonding in inorganic molecular and solid state compounds spectroscopic, magnetic, physical and chemical properties of inorganic compounds chemical reactivity, physical properties and applications of inorganic compounds and materials mechanisms of inorganic reactions organometallic compounds inorganic cluster chemistry heterogenous and homogeneous catalytic reactions promoted by inorganic compounds thermodynamics and kinetics of significant new and known inorganic compounds supramolecular systems and coordination polymers bio-inorganic chemistry and applications of inorganic compounds in biological systems and medicine environmental and sustainable energy applications of inorganic compounds and materials MD