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Toward Room-Temperature Thermochromism of VO2 by Nb Doping: Magnetic Investigations
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-11-26 , DOI: 10.1021/acs.chemmater.9b03906
Shian Guan 1 , Mélanie Souquet-Basiège 1 , Olivier Toulemonde 1 , Dominique Denux 1 , Nicolas Penin 1 , Manuel Gaudon 1 , Aline Rougier 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-11-26 , DOI: 10.1021/acs.chemmater.9b03906
Shian Guan 1 , Mélanie Souquet-Basiège 1 , Olivier Toulemonde 1 , Dominique Denux 1 , Nicolas Penin 1 , Manuel Gaudon 1 , Aline Rougier 1
Affiliation
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Using a synthesis route based on carbon as the reducing agent mixed with Nb-doped V2O5 nanopowders, highly crystallized Nb-doped VO2 (M) particles, with tunable content of niobium (Nb), are successfully prepared. The morphology and the crystalline structure are first studied in regard to synthesis parameters and chemical composition for various thermal treatment temperatures/durations and niobium doping concentrations. The second part of this paper is devoted to the control, in Nb-doped VO2, of the phase transition temperature from monoclinic to rutile (M → R transition) versus the niobium doping concentration associated with thermochromic properties and different property changes characterized by differential scanning calorimetry and magnetic and electrical measurements. The niobium introduction allows the decrease of the thermochromic transition from 68 °C down to around room temperature for an effective Nb concentration of approximatively 6 mol % for the V0.94Nb0.06O2±δ composition. A significant result is the decrease of both the hysteresis width as well as the phase transition amplitude supported by latent heat, magnetic behavior, and electrical transport versus niobium concentration. These phenomena are correlated to the breaking of the V–V pairing occurring in the monoclinic form when niobium ions are introduced. Finally, a deep interpretation of the Nb-doped VO2 magnetic behavior is performed considering the impact of niobium concentration and crystallite sizes on the intensity of the Curie magnetic residue plus Van Vleck susceptibility in the low temperature form (M) and on the intensity of the Pauli magnetism of the high temperature form (R).
中文翻译：
铌掺杂对VO 2室温室温热致变色的影响：磁性研究
使用基于碳的还原剂与Nb掺杂的V 2 O 5纳米粉混合的合成路线，成功制备了具有可调谐含量的铌（Nb）的高度结晶的Nb掺杂的VO 2（M）颗粒。首先就各种热处理温度/持续时间和铌掺杂浓度的合成参数和化学组成研究了形态和晶体结构。本文的第二部分专门针对Nb掺杂VO 2中的控制从单斜晶到金红石的相变温度（M→R转变）与铌的掺杂浓度有关，铌的掺杂与热致变色性质和不同性质的变化有关，以差示扫描量热法和磁电测量为特征。铌的引入使V 0.94 Nb 0.06 O 2±δ的有效Nb浓度大约为6 mol％，从而使热致变色温度从68°C降低到室温附近。作品。一个显着的结果是磁滞宽度以及潜热，磁行为和电传输相对于铌浓度所支持的相变幅度都减小了。这些现象与引入铌离子时以单斜晶形式发生的V-V配对的破坏有关。最后，考虑到铌浓度和微晶尺寸对居里磁性残余强度加上范式Vleck磁化率和低温形式（M）的影响，对Nb掺杂的VO 2磁性行为进行了深入的解释。高温形式的保利磁性（R）。
更新日期：2019-11-28
中文翻译：
铌掺杂对VO 2室温室温热致变色的影响：磁性研究
使用基于碳的还原剂与Nb掺杂的V 2 O 5纳米粉混合的合成路线，成功制备了具有可调谐含量的铌（Nb）的高度结晶的Nb掺杂的VO 2（M）颗粒。首先就各种热处理温度/持续时间和铌掺杂浓度的合成参数和化学组成研究了形态和晶体结构。本文的第二部分专门针对Nb掺杂VO 2中的控制从单斜晶到金红石的相变温度（M→R转变）与铌的掺杂浓度有关，铌的掺杂与热致变色性质和不同性质的变化有关，以差示扫描量热法和磁电测量为特征。铌的引入使V 0.94 Nb 0.06 O 2±δ的有效Nb浓度大约为6 mol％，从而使热致变色温度从68°C降低到室温附近。作品。一个显着的结果是磁滞宽度以及潜热，磁行为和电传输相对于铌浓度所支持的相变幅度都减小了。这些现象与引入铌离子时以单斜晶形式发生的V-V配对的破坏有关。最后，考虑到铌浓度和微晶尺寸对居里磁性残余强度加上范式Vleck磁化率和低温形式（M）的影响，对Nb掺杂的VO 2磁性行为进行了深入的解释。高温形式的保利磁性（R）。
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