Composition-dependent xBa(Zr0.2Ti0.8)O3-(1-x)(Ba0.7Ca0.3)TiO3 bulk ceramics for high energy storage applications

被引：69

作者：

Jayakrishnan, A. R. ^{[1
]}

Alex, Kevin, V ^{[1
]}

Thomas, Athul ^{[1
]}

Silva, J. P. B. ^{[2
,3
,4
]}

Kamakshi, K. ^{[5
]}

Dabra, Navneet ^{[6
]}

Sekhar, K. C. ^{[1
]}

Moreira, J. Agostinho ^{[3
,4
]}

Gomes, M. J. M. ^{[2
]}

机构：

[1] Cent Univ Tamil Nadu, Sch Basic & Appl Sci, Dept Phys, Thiruvarur 610005, India

[2] Ctr Fis Univ Minho Porto CF UM UP, Campus Gualtar, P-4710057 Braga, Portugal

[3] Univ Porto, Fac Ciencias, Dept Fis & Astron, IFIMUP, Rua Campo Alegre 687, P-4169007 Porto, Portugal

[4] Univ Porto, Fac Ciencias, Dept Fis & Astron, IN Inst Nanosci & Nanotechnol, Rua Campo Alegre 687, P-4169007 Porto, Portugal

[5] Madanapalle Inst Technol & Sci, Dept Phys, Madanapalle 517325, Andhra Pradesh, India

[6] Punjabi Univ Patiala, Mata Sahib Kaur Girls Coll, Talwandi Sabo 151302, Punjab, India

来源：

CERAMICS INTERNATIONAL | 2019年 / 45卷 / 05期

关键词：

Energy storage capacitors; Lead free ceramics; Spontaneous polarization; Fatigue; Dielectric constant; Raman spectroscopy; THIN-FILMS; DIELECTRIC-PROPERTIES; PHASE-TRANSITIONS; ELECTRIC FATIGUE; GRAIN-SIZE; DENSITY; VIBRATION;

D O I：

10.1016/j.ceramint.2018.11.250

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：

This work reports the composition dependent microstructure, dielectric, ferroelectric and energy storage properties, and the phase transitions sequence of lead free xBa(Zr0.2Ti0.8)O-3-(1-x)(Ba0.7Ca0.3)TiO3 [xBZT-(1-x) BCT] ceramics, with x = 0.4, 0.5 and 0.6, prepared by solid state reaction method. The XRD and Raman scattering results confirm the coexistence of rhombohedral and tetragonal phases at room temperature (RT). The temperature dependence of Raman scattering spectra, dielectric permittivity and polarization points a first phase transition from ferroelectric rhombohedral phase to ferroelectric tetragonal phase at a temperature (TR-T) of 40 degrees C and a second phase transition from ferroelectric tetragonal phase - paraelectric pseudocubic phase at a temperature (TT-C) of 110 degrees C. The dielectric analysis suggests that the phase transition at TT-C is of diffusive type and the BZT-BCT ceramics are a relaxor type ferroelectric materials. The composition induced variation in the temperature dependence of dielectric losses was correlated with full width half maxima (FWHM) of A(1), E(LO) Raman mode. The saturation polarization (P-s) approximate to 8.3 mu C/cm(2) and coercive fields approximate to 2.9 kV/cm were found to be optimum at composition x = 0.6 and is attributed to grain size effect. It is also shown that BZT-BCT ceramics exhibit a fatigue free response up to 10(5) cycles. The effect of a.c. electric field amplitude and temperature on energy storage density and storage efficiency is also discussed. The presence of high TT-C (110 degrees C), a high dielectric constant (epsilon(r) approximate to 12,285) with low dielectric loss (0.03), good polarization (P-s approximate to 8.3 mu C/cm(2)) and large recoverable energy density (W = 121 mJ/cm(3)) with an energy storage efficiency (eta) of 70% at an electric field of 25 kV/cm in 0.6BZT-0.4BCT ceramics make them suitable candidates for energy storage capacitor applications.

引用

页码：5808 / 5818

页数：11

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