Crystal structure of A-site deficient La0.2Sr0.7-xCaxTiO3 perovskite at ambient conditions and high temperatures: a neutron powder diffraction study.
Crystal structure of A-site deficient La0.2Sr0.7-xCaxTiO3 perovskite at ambient conditions and high temperatures: a neutron powder diffraction study.
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环境条件和高温下 A 位缺陷 La0.2Sr0.7-xCaxTiO3 钙钛矿的晶体结构：中子粉末衍射研究。
DOI：
10.1039/c5dt00238a
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Aljaberi AD
中科院分区：
文献类型：
--
作者：
Aljaberi AD
The crystal structures of several members of the solid solution perovskite La0.2Sr0.7−xCaxTiO3 were investigated using the Rietveld analysis of neutron powder diffraction patterns collected in ambient conditions and high temperatures. At room temperature, samples showed a tetragonal I4/mcm symmetry for compositions with 0.1 ≤ x ≤ 0.35 followed by a phase transition to the orthorhombic Pbnm symmetry for compositions with 0.4 ≤ x ≤ 0.7. Samples with the orthorhombic symmetry showed two reversible phase transitions in the temperature range 20 °C–900 °C. The first phase transition was a discontinuous Pbnm–I4/mcm around 300 °C and the second was a continuous I4/mcm–Pmm transition around 900 °C. The lower symmetries resulted from very small distortions and changes in tilts of the BO6 octahedra of this perovskite material; which was a direct result from the A-site ionic radius mismatch.
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影响因子：
3.1
作者：
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通讯作者：
T. Yamanaka;Noriyuki Hirai;Y. Komatsu
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DOI：
--
发表时间：
2006
期刊：
影响因子：
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作者：
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DOI：
--
发表时间：
2011
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
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通讯作者：
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影响因子：
11.9
作者：
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影响因子：
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