Nucleation of Perovskite Nanocrystals in a Levitating Liquid
Nucleation of Perovskite Nanocrystals in a Levitating Liquid
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钙钛矿纳米晶体在悬浮液体中的成核
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Hart
中科院分区：
文献类型：
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作者：
J. Tangeman;B. Phillips;R. Hart
使用无容器液相处理方法来合成两种玻璃，两者均含有氧化铝（A）、氧化钇（Y）和氧化镧（L），并且一种还含有约20摩尔%的二氧化硅（S）。在表示为AYL和AYLS的两种材料中，氧化铝是主要组分（>50摩尔%），并且氧化镧：氧化钇的比率为100：2：1。各种实验技术，如X射线衍射，高场27铝魔角自旋核磁共振（MAS-NMR），差示扫描量热法，和中子衍射，被用来分析从液相处理和随后的热处理，以及所作的和热处理的材料的热力学性质的非晶相的结构。对这些玻璃和液体的实验结果阐明了玻璃化转变和结晶状态之间发生的转变的性质，并使一类新的氧化铝基纳米材料的合成成为可能。
Containerless liquid-phase processing methods were used to synthesize two glasses, both containing alumina (A), yttria (Y), and lanthana (L), and one containing ∼20 mole% silica (S) as well. In both materials, denoted AYL and AYLS, alumina is the dominant component (>50 mole%), and the lanthana:yttria ratio is ∼2:1. A variety of experimental techniques, e.g. X-ray diffraction, high-field 27Al magic angle spinning-nuclear magnetic resonance (MAS-NMR), differential scanning calorimetry, and neutron diffraction, were used to analyze both the structure of the amorphous phases resulting from liquid-phase processing and subsequent thermal treatments, and the thermodynamic properties of the as-made and heat-treated materials. The results of the experiments on these glasses and liquids have elucidated the nature of the transitions occurring between the glass transition and crystalline regimes, and have enabled the synthesis of a novel class of alumina-based nanomaterials.