Dielectric and Ferroelectric Properties of Lead-Free NKN and NKN-Based Ceramics

被引：11

作者：

Suchanicz, J. ^{[1
]}

Smeltere, I. ^{[2
]}

Finder, A. ^{[3
]}

Konieczny, K. ^{[1
]}

Garbarz-Glos, B. ^{[1
]}

Bujakiewicz-Koronska, R. ^{[1
]}

Latas, M. ^{[4
]}

Antonova, M. ^{[2
]}

Sternberg, A. ^{[2
]}

Sokolowski, M. ^{[5
]}

机构：

[1] Pedag Univ, Inst Phys, PL-30084 Krakow, Poland

[2] Univ Latvia, Inst Solid State Phys, LV-1063 Riga, Latvia

[3] Natl High Sch, PL-38500 Sanok, Poland

[4] Sch Tech & Econ, PL-32400 Myslenice, Poland

[5] AGH Univ Sci & Technol, Dept Elect, PL-30059 Krakow, Poland

来源：

FERROELECTRICS | 2011年 / 424卷

关键词：

D O I：

10.1080/00150193.2011.623927

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Lead-free ceramics of Na0.5K0.5NbO3 (NKN), Na0.5K0.5(Nb0.94Sb0.06)O-3 (NKNS6) and Na0.5K0.5(Nb0.94Sb0.06)O-3 + 0.5%MnO2 (NKNS6 + 0.5%MnO2) have been prepared by a solid phase hot pressing sintering process. X-ray diffraction results show that the obtained samples possess the perovskite structure. The micrograph of the fractured surface showed a dense structure in a good agreement with that of 91-94% relative density determined by the Archimedes method. An average grain size decreases with Sb and Mn doping (from about 20 mu m for NKN to about 5 and 2 mu m for NKNS6 and NKNS6 + 0.5%MnO2, respectively). Low frequency (100 Hz-200 kHz) investigations revealed the diffuse phase transitions. It was found that Mn or Sb doping influence dielectric and ferroelectric properties. The pyroelectric and hysteresis loops measurements show that the samples are ferroelectric with a relatively large remanent polarization (18-55 mu C/cm(2)) and a low coercive field (7-10 kV/cm). The obtained results are discussed in the framework of foreign ions/lattice imperfections, which create local electric and elastic fields. The obtained materials are considered to be promising candidates for lead-free electronic ceramics.

引用

页码：53 / 58

页数：6

共 5 条

[1] ⟨001⟩ textured (K0.5Na0.5)Nb0.97Sb0.03)O3 piezoelectric ceramics with high electromechanical coupling over a broad temperature range [J].