Ferroelectric phase transitions in sodium nitrite nanocomposites

被引：29
|
作者：
Fokin, A. [1 ]
Kumzerov, Yu. [1 ]
Koroleva, E. [1 ]
Naberezhnov, A. [1 ]
Smirnov, O. [2 ]
Tovar, M. [3 ]
Vakhrushev, S. [1 ]
Glazman, M. [4 ]
机构：
[1] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
[2] Petersburg Nucl Phys Inst, Gatchina 188300, Russia
[3] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany
[4] Gen Innovat & Goods Inc, Columbus, OH 43209 USA
来源：
JOURNAL OF ELECTROCERAMICS | 2009年 / 22卷 / 1-3期
基金：
俄罗斯基础研究基金会;
关键词：
Nanocomposite ferroelectrics; Neutron diffraction; Size effect; Porous media; POROUS-GLASS; NANO2; SOLIDIFICATION; PARTICLES; SIZE;
D O I：
10.1007/s10832-008-9431-4
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The structure and dielectric properties of sodium nitrite and its solid solutions confined in porous glasses have been studied. The temperature dependences of the order parameter and the unit cell volume for NaNO2 embedded into porous glasses with different pore sizes were studied by neutron diffraction in the ferro- and paraelectric phases. The characteristic sizes of nanoparticles are determined. It is shown that at a size of nanoparticles smaller than similar to 50 nm a crossover of the phase transition from first order to second order is observed. The effect of doping of sodium nitrite with potassium nitrite on the dielectric properties of the nanocomposite materials was studied and a strong lowering of the dielectric losses was observed.
引用
收藏
页码：270 / 275
页数：6
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