ATOMIC DISPLACEMENT RELATIONSHIP TO CURIE TEMPERATURE AND SPONTANEOUS POLARIZATION IN DISPLACIVE FERROELECTRICS
ATOMIC DISPLACEMENT RELATIONSHIP TO CURIE TEMPERATURE AND SPONTANEOUS POLARIZATION IN DISPLACIVE FERROELECTRICS
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DOI：
10.1103/physrev.172.551
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发表时间：
1968-01-01
期刊：
影响因子：
--
通讯作者：
JAMIESON, PB
中科院分区：
文献类型：
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作者：
ABRAHAMS, SC;KURTZ, SK;JAMIESON, PB
位移型铁电晶体中从非极性到极性的相变伴随着某些原子从其高温对称位置的位移Δ z。对所有已确定原子位置的位移型铁电体的研究表明，Δ z与居里温度TC之间存在基本关系。这个关系式是TC =（K2 k）（Δ z）2，其中K是力常数的量纲，k是玻尔兹曼常数，TC是绝对单位。基于十种不同铁电体的Δ z和T C，最小二乘拟合得到K 2 k=（2.00±0. 0 9）× 10 4 K Å-2。此外，发现自发极化Ps与Δ z的关系式为Ps =（258±9）Δ z μ Ccm − 2。K是根据原子间力常数沿着极轴进行讨论的。
The phase transition from nonpolar to polar in displacive ferroelectric crystals is accompanied by the displacement Δ z of certain atoms from their higher-temperature symmetry positions. A study of all displacive ferroelectrics in which atomic positions have been determined has shown that a fundamental relationship exists between Δ z and the Curie temperature T C. This relation has been form T C=(K 2 k)(Δ z) 2, where K has the dimensions of a force constant, k is Boltzmann's constant, and T C is in absolute units. A least-squares fit, based on Δ z and T C for ten different ferroelectrics, gives K 2 k=(2.00±0. 0 9)× 10 4 K Å− 2. In addition, the spontaneous polarization P s is found to be related to Δ z by the equation P s=(258±9) Δ z μC cm− 2. K is discussed in terms of the interatomic force constant along the polar axis.