Grigalaitis Robertas, Banys Juras, Lapinskas Saulius, Erdem Emre, Böttcher Ralf, Gläsel Hans-Jürgen, Hartmann Eberhard
Physic Faculty, Vilnius University, Lithuania.
IEEE Trans Ultrason Ferroelectr Freq Control. 2006 Dec;53(12):2270-4. doi: 10.1109/tuffc.2006.172.
The dielectric properties of nanograin ferroelectric lead titanate crystals are presented. The PbTiO3 samples were prepared by pressing nanopowders into plates and were studied experimentally by dielectric permittivity measurements in a wide frequency and temperature range. The TC dependence obtained showed a critical change of behavior with increasing mean nanoparticle size in the 9-nm region. The theoretical calculations based on Monte Carlo simulation were performed to describe the behavior of this material. It was shown that the distribution of nanoparticle sizes in the sample taken into account with the Monte Carlo method describes the dielectric properties of PbTiO3 nanocrystals quite well.
本文介绍了纳米晶铁电钛酸铅晶体的介电性能。通过将纳米粉末压制成板制备了PbTiO₃样品，并在宽频率和温度范围内通过介电常数测量对其进行了实验研究。得到的居里温度（TC）依赖性表明，随着平均纳米颗粒尺寸在9纳米区域内增加，行为发生了临界变化。基于蒙特卡罗模拟进行了理论计算，以描述这种材料的行为。结果表明，用蒙特卡罗方法考虑样品中纳米颗粒尺寸的分布，能够很好地描述PbTiO₃纳米晶体的介电性能。
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