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In Situ High-Temperature Structural Analysis of High-Entropy Rare-Earth Sesquioxides
Chemistry of Materials ( IF 7.2 ) Pub Date : 2023-01-13 , DOI: 10.1021/acs.chemmater.2c03088
Matheus Pianassola 1, 2 , Kaden Anderson 1, 2 , Can Agca 3 , Chris J. Benmore 4 , Jake W. McMurray 3 , Jöerg C. Neuefeind 5 , Charles Melcher 1, 2, 6 , Mariya Zhuravleva 1, 2
Chemistry of Materials ( IF 7.2 ) Pub Date : 2023-01-13 , DOI: 10.1021/acs.chemmater.2c03088
Matheus Pianassola 1, 2 , Kaden Anderson 1, 2 , Can Agca 3 , Chris J. Benmore 4 , Jake W. McMurray 3 , Jöerg C. Neuefeind 5 , Charles Melcher 1, 2, 6 , Mariya Zhuravleva 1, 2
Affiliation
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High-entropy rare-earth (RE) sesquioxides (RE2O3) containing five cations in equimolar amounts have been investigated for a variety of applications, but little is known about their polymorphic behavior and coefficient of thermal expansion. Here, we evaluate the effect of the average ionic radius (AIR) on the polymorphism of high-entropy RE2O3. Powder samples of compositions 1 (Lu,Y,Ho,Nd,La)2O3 (AIR = 0.938 Å) and 2 (Gd,Eu,Sm,Nd,La)2O3 (AIR = 0.982 Å) were synthesized via a wet chemical method, and bead samples were prepared for aerodynamic levitation by melting the powders in a copper hearth. Structural transitions were monitored upon cooling from the melt to 1000 °C via in situ X-ray diffraction on aerodynamically levitated samples. The phase evolution was liquid, hexagonal H-type, and monoclinic B-type for composition 1 and liquid, cubic X-type, H-type, and B-type for composition 2. Based on their AIR, the general polymorphic transformations of the high-entropy RE2O3 follow the trend of single-RE RE2O3, but the transition temperatures differ from those of single-RE RE2O3. The coefficient of thermal expansion values of the B-type phase of compositions 1 and 2 are similar to those of Gd2O3 and previously published high-entropy RE2O3.
中文翻译:
高熵稀土倍半氧化物的原位高温结构分析
已经研究了含有等摩尔量的五个阳离子的高熵稀土 (RE) 三氧化二 (RE 2 O 3 ) 的各种应用,但对其多晶型行为和热膨胀系数知之甚少。在这里,我们评估了平均离子半径 (AIR) 对高熵 RE 2 O 3多态性的影响。成分 1 (Lu,Y,Ho,Nd,La) 2 O 3 (AIR = 0.938 Å) 和 2 (Gd,Eu,Sm,Nd,La) 2 O 3的粉末样品(AIR = 0.982 Å) 通过湿化学法合成,并通过在铜炉中熔化粉末来制备用于空气动力学悬浮的珠子样品。在空气动力学悬浮样品上通过原位 X 射线衍射从熔体冷却到 1000 °C 时监测结构转变。成分 1 的相演化为液体、六方 H 型和单斜 B 型,成分 2 的相演化为液体、立方 X 型、H 型和 B 型。基于它们的 AIR,一般多晶型转变高熵稀土2 O 3遵循单一稀土 RE 2 O 3的趋势,但转变温度与单一稀土 RE 2 O 3不同. 组合物1和2的B型相的热膨胀系数值与Gd 2 O 3和先前发表的高熵RE 2 O 3的热膨胀系数值相似。
更新日期:2023-01-13
中文翻译:
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高熵稀土倍半氧化物的原位高温结构分析
已经研究了含有等摩尔量的五个阳离子的高熵稀土 (RE) 三氧化二 (RE 2 O 3 ) 的各种应用,但对其多晶型行为和热膨胀系数知之甚少。在这里,我们评估了平均离子半径 (AIR) 对高熵 RE 2 O 3多态性的影响。成分 1 (Lu,Y,Ho,Nd,La) 2 O 3 (AIR = 0.938 Å) 和 2 (Gd,Eu,Sm,Nd,La) 2 O 3的粉末样品(AIR = 0.982 Å) 通过湿化学法合成,并通过在铜炉中熔化粉末来制备用于空气动力学悬浮的珠子样品。在空气动力学悬浮样品上通过原位 X 射线衍射从熔体冷却到 1000 °C 时监测结构转变。成分 1 的相演化为液体、六方 H 型和单斜 B 型,成分 2 的相演化为液体、立方 X 型、H 型和 B 型。基于它们的 AIR,一般多晶型转变高熵稀土2 O 3遵循单一稀土 RE 2 O 3的趋势,但转变温度与单一稀土 RE 2 O 3不同. 组合物1和2的B型相的热膨胀系数值与Gd 2 O 3和先前发表的高熵RE 2 O 3的热膨胀系数值相似。