<abstract xmlns="http://www.w3.org/1999/xhtml">Zr substituted 0.8BaTiO30.2 Bi0.5K0.5TiO3 lead free ceramic materials with a composition 0.8Ba0.2(Bi0.5K0.5)Ti1-xZrxO3 (0.01 ≤ x ≤ 0.06) were prepared by conventional solid state reaction method followed by high energy ball milling. The X-ray diffraction studies confirmed the tetragonal structure of the material at room temperature. Density was decreasing with the substitution of Zr. Microstructure studies were done by using scanning electron microscope. Temperature and frequency dependent dielectric studies were carried out and showed that the dielectric constant, dielectric loss and Curie temperature were decreasing with the substitution of Zr. Relaxor behavior was observed in all the Zr substituted samples. Degree of diffuseness was calculated from the modified Curie-Weiss law and it was found to increase with the substitution of Zr. Frequency and temperature dependent AC conductivity was calculated and it was found to obey Jonscher’s power law. Substitution of Zr decreased the conductivity of the material. Activation energy was calculated and it was decreasing with an increase in Zr substitution.</abstract>

Zr substituted 0.8BaTiO30.2 Bi0.5K0.5TiO3 lead free ceramic materials with a composition 0.8Ba0.2(Bi0.5K0.5)Ti1-xZrxO3 (0.01 ≤ x ≤ 0.06) were prepared by conventional solid state reaction method followed by high energy ball milling. The X-ray diffraction studies confirmed the tetragonal structure of the material at room temperature. Density was decreasing with the substitution of Zr. Microstructure studies were done by using scanning electron microscope. Temperature and frequency dependent dielectric studies were carried out and showed that the dielectric constant, dielectric loss and Curie temperature were decreasing with the substitution of Zr. Relaxor behavior was observed in all the Zr substituted samples. Degree of diffuseness was calculated from the modified Curie-Weiss law and it was found to increase with the substitution of Zr. Frequency and temperature dependent AC conductivity was calculated and it was found to obey Jonscher’s power law. Substitution of Zr decreased the conductivity of the material. Activation energy was calculated and it was decreasing with an increase in Zr substitution.

Structural, dielectric and AC conductivity studies on 0.8Ba0.2(Bi0.5K0.5)Ti1-xZrxO3 lead free ceramic system

Materials Science-Poland

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Structural, dielectric and AC conductivity studies on 0.8Ba0.2(BiK)TiZrO lead free ceramic system

Zr substituted 0.8BaTiO30.2 Bi0.5K0.5TiO3 lead free ceramic materials with a composition 0.8Ba0.2(Bi0.5K0.5)Ti1-xZrxO3 (0.01 ≤ x ≤ 0.06) were prepared by...

x	0.01	0.02	0.03	0.04	0.05	0.06
a [Å]	3.995	4.003	4.012	4.022	4.032	4.045
c [Å]	4.096	4.103	4.111	4.118	4.126	4.133
c/a	1.025	1.0249	1.0246	1.0238	1.0233	1.0217
Theoretical density[kg/m³] [11, 15]	5860	5840	5810	5790	5760	5720
Exp. density[kg/m³]	5284	5269	5253	5234	5230	5222
ε_RT [1 kHz]	1650	1550	1451	1408	1361	1315
ε_max [1 kHz]	2256	2065	2078	1605	1518	1466
tanδ (at RT for 1 kHz)	0.32	0.29	0.25	0.2	0.17	0.11
γ[1 kHz]	1.41	1.42	1.60	1.71	1.82	1.78
E_AC[eV]	0.28	0.34	0.37	0.23	0.18	0.14

Structural, dielectric and AC conductivity studies on 0.8Ba0.2(Bi_0.5K_0.5)Ti_1-xZr_xO₃ lead free ceramic system

Article Category: Research Article

Published Online: Sep 12, 2016

Page range: 669 - 675

Received: Feb 18, 2016

Accepted: Jul 11, 2016

DOI: https://doi.org/10.1515/msp-2016-0088

Keywords
lead free ceramics, BaTiO Bi KTiO, dielectric, AC conductivity

© 2016 M.N.V. Ramesh et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Various parameters as a function of Zr substitution in 0.8Ba0.2(Bi0.5K0.5)Ti1 - xZrxO3 (x = 0.01 to 0.06) lead free ceramics.

Structural, dielectric and AC conductivity studies on 0.8Ba0.2(Bi0.5K0.5)Ti1-xZrxO3 lead free ceramic system

Article Category: Research Article

Published Online: Sep 12, 2016

Page range: 669 - 675

Received: Feb 18, 2016

Accepted: Jul 11, 2016

DOI: https://doi.org/10.1515/msp-2016-0088

Keywordslead free ceramics, BaTiO Bi KTiO, dielectric, AC conductivity

© 2016 M.N.V. Ramesh et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Various parameters as a function of Zr substitution in 0.8Ba0.2(Bi0.5K0.5)Ti1 - xZrxO3 (x = 0.01 to 0.06) lead free ceramics.

Structural, dielectric and AC conductivity studies on 0.8Ba0.2(Bi_0.5K_0.5)Ti_1-xZr_xO₃ lead free ceramic system

Keywords
lead free ceramics, BaTiO Bi KTiO, dielectric, AC conductivity