The effect of point defects on ferroelastic phase transition of lanthanum-doped calcium titanate ceramics
The effect of point defects on ferroelastic phase transition of lanthanum-doped calcium titanate ceramics
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DOI：
10.1016/j.jallcom.2012.02.021
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发表时间：
2013-11
影响因子：
6.2
通讯作者：
Y. Ni;Zhen Zhang;Dong Wang;Yu Wang;X. Ren
中科院分区：
文献类型：
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作者：
Y. Ni;Zhen Zhang;Dong Wang;Yu Wang;X. Ren
本文以la掺杂catio3为研究对象，研究点缺陷对陶瓷铁弹性相变的影响。动态力学测量结果表明，Ca(1−x)La2x/ 3tio3的正交向四方相变温度随着掺杂剂（La）浓度的增加而降低。掺杂量为x= 0.45和0.7的样品在过渡过程中表现出不同的结构演化特征。此外，当x= 0.7时，存储模量表现出频率相关的最小值atTg，可以很好地拟合Vogel-Fulcher关系，并且相应的内耗在相同的温度范围内也表现出频率相关的峰值。这些结果表明，掺杂La抑制了catio3中的铁弹性相变，并在Ca(1−x)La2x/3TiO3中诱导出“玻璃样”行为，类似于掺杂ni的Ti50−xNi50+x中的“应变玻璃”。
In the present paper, La-doped CaTiO3is studied to investigate the effect of point defects on ferroelastic phase transition of the ceramics. The dynamic mechanical measurements show that the transition temperature of the orthorhombic to tetragonal phase transition of Ca(1−x)La2x/3TiO3decreases with increasing dopant (La) concentrationx. The samples with the dopant content ofx= 0.45 and 0.7 exhibit different structure evolution features during their transition processes as revealed byin situpowder X-ray diffraction (XRD) measurement. Moreover, whenx= 0.7, the storage modulus shows a frequency-dependent minimum atTg, which can be well fitted with the Vogel–Fulcher relation, and the corresponding internal friction also exhibits a frequency-dependent peak within the same temperature regime. These results thus indicate that doping La suppresses ferroelastic phase transition in CaTiO3and induces a “glassy-like” behavior in Ca(1−x)La2x/3TiO3, which is similar to “strain glass” in Ni-doped Ti50−xNi50+x.