Dependence of the Dielectric Constant on Electric Field in SrTi( 16 O 1 − x 18 O x ) 3 at Oxygen Substitution
Dependence of the Dielectric Constant on Electric Field in SrTi( 16 O 1 − x 18 O x ) 3 at Oxygen Substitution
复制标题
氧置换时 SrTi( 16 O 1 − x 18 O x ) 3 介电常数对电场的依赖性
DOI：
10.1080/00150190390204105
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发表时间：
2003
期刊：
影响因子：
0.8
通讯作者：
B. Sorkin
中科院分区：
文献类型：
--
作者：
P. Konsin;B. Sorkin
发展了氧同位素交换初始量子顺电材料(SrTiO3、KTaO3和CaTiO3)的介电性质理论。考虑电子-晶格p-d相互作用以及TO和TA振动B的耦合，得到了量子顺电体的软模频率z的表达式。频率z与质量有关，包括对氧原子质量的依赖。在SrTi(16O1mx18Ox)3中，存在一个临界值x=xc，在这个临界值，原子的零点运动(量子涨落)被部分抑制，铁电相变发生在x>；xc处。计算了电场作用下铁电转变温度Tc与x的关系。
A theory of the dielectric properties of oxygen-isotope-exchanged incipient quantum paraelectrics (SrTiO 3, KTaO 3 and CaTiO 3 ) is developed. Taking into account the electron-lattice p - d interaction and the coupling of TO and TA vibration B, an expression of the soft mode frequency z for the quantum paraelectric is obtained. Frequency z is mass dependent including the dependence on the mass of an oxygen atom. In SrTi( 16 O 1 m x 18 O x ) 3, there is a critical x = x c value, at which zero-point motion of atoms (quantum fluctuations) is partially suppressed and the ferroelectric phase transition occurs at x > x c . The dependence of the ferroelectric transition temperature T c on x in the electric field is calculated.