Effect of NaNbO3 substitution on the quantum paraelectric behavior of CaTiO3

被引：2
|
作者：
Tripathi, Saurabh [1 ]
Kumar, Anil [2 ]
Waghmare, Umesh V. [2 ]
Pandey, Dhananjai [1 ]
机构：
[1] Banaras Hindu Univ, Sch Mat Sci & Technol, Varanasi 221005, Uttar Pradesh, India
[2] Jawaharlal Nehru Ctr Adv Sci Res, Theoret Sci Unit, Bangalore 560064, Karnataka, India
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 21期
关键词：
SOFT PHONON MODES; FERROELECTRICITY; TRANSITION;
D O I：
10.1103/PhysRevB.81.212101
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Low-temperature dielectric and x-ray diffraction studies on NaNbO3 substituted CaTiO3 reveals suppression of quantum fluctuations, when the concentration of NaNbO3 exceeds 2%. Group-subgroup considerations in conjunction with the knowledge of unstable phonon modes, obtained by first-principles calculations, show that the low-temperature phase is a unique type of ferrielectric phase that exhibits planar antiferroelectric and axial ferroelectric orders.
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页数：4
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