Tetragonal nanocrystals from the Zr0.5Ce0.5O2 solid solution by hydrothermal method
Tetragonal nanocrystals from the Zr0.5Ce0.5O2 solid solution by hydrothermal method
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DOI：
10.1021/jp050047c
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发表时间：
2005-04-07
影响因子：
3.3
通讯作者：
Yoshimura, M
中科院分区：
文献类型：
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作者：
Ahniyaz, A;Watanabe, T;Yoshimura, M
首次用水热法在120℃下反应6h，得到了尺寸为5+/-1 nm的四方相固溶体纳米晶，并对其进行了拉曼光谱和X射线衍射分析。它的特征是轴向比为c/a=1的C型，但有氧离子位移。所制备的样品在性质上是含水的，这是导致晶格膨胀的原因。然而，保持在结构中的大部分水可以通过加热样品在600℃以上被排出。在1050+/-50℃以上，四方相Zr0.5Ce0.5O2的C型固溶体分解成两个相，立方相和t型的四方相。
The formation of tetragonal Zr0.5Ce0.5O2 Solid solution nanocrystallites of 5 +/- 1 nm size by a hydrothermal method at 120 degrees C for 6 h was confirmed by careful Raman and XRD studies for the first time. It was characterized as the C-form with an axial ratio of c/a = 1 but with oxygen ion displacements. The asprepared sample was hydrous in nature, which is responsible for the lattice expansion. However, most of the water held in the structure can be expelled by heating the sample above 600 degrees C. Above 1050 +/- 50 degrees C the C-form of tetragonal Zr0.5Ce0.5O2 solid solution dissociates into two phases, cubic phase and the t-form of tetragonal phases.