Kinka Martynas, Banys Juras, Böhlmann Winfried, Bierwirth Eicke, Hartmann Martin, Michel Dieter, Völkel Georg, Pöppl Andreas
Physic Faculty, Vilnius University, Sauletekio 9, Vilnius LT-10222, Lithuania.
IEEE Trans Ultrason Ferroelectr Freq Control. 2006 Dec;53(12):2305-8. doi: 10.1109/tuffc.2006.178.
Dielectric properties of barium titanate (BaTiO3) particles, synthesized directly in the pores of MCM-41 materials, have been investigated in the frequency range from 20 Hz to 1 MHz for temperature intervals from 100 K to 500 K. The dielectric spectra of BaTiO3 confined in these molecular sieves were compared with the results obtained from the investigation of pure MCM-41 materials. Obtained results confirmed successful incorporation of BaTiO3 into porous matrix, but no phase transition from paraelectric to ferroelectric phase was observed due to the particle size being smaller than the critical size. Also, the overall dielectric response of investigated materials is strongly influenced by adsorbed water molecules.
对直接在MCM - 41材料孔隙中合成的钛酸钡（BaTiO₃）颗粒的介电性能进行了研究，研究频率范围为20 Hz至1 MHz，温度区间为100 K至500 K。将这些分子筛中受限的BaTiO₃介电谱与纯MCM - 41材料的研究结果进行了比较。所得结果证实BaTiO₃成功掺入多孔基质中，但由于颗粒尺寸小于临界尺寸，未观察到从顺电相到铁电相的相变。此外，所研究材料的整体介电响应受到吸附水分子的强烈影响。
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