Dielectric and ferroelectric characteristics of barium zirconate titanate ceramics prepared from mixed oxide method

Moura, F.; Simões, Alexandre Zirpoli; Stojanović, B. D.; Zaghete, M. A.; Longo, Elson; Varela, José Arana

doi:10.1016/j.jallcom.2007.07.077

Cited by 152 publications

(57 citation statements)

References 13 publications

(18 reference statements)

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“…Also as the Zr content increases, the room temperature dielectric constant and maximum dielectric constant values are also decreasing. It is well known that as the Zr content in BaTiO 3 increases the dielectric constant values decrease [1,2,5,7,9]. Dielectric loss is higher at lower frequencies and decreases with an increase of frequency.…”

Section: Dielectric Studiesmentioning

confidence: 99%

“…Effect of Zr substitution in BaTiO 3 has been extensively studied by many authors using different methods for different applications at different experimental conditions [1][2][3][4][5][6][7][8][9][10][11]. Zr substituted BaTiO 3 ferroelectric materials have been used as multilayer ceramic capacitors (MLCC), pyroelectric sensors, piezoelectric actuators, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Zr substituted BaTiO 3 ferroelectric materials have been used as multilayer ceramic capacitors (MLCC), pyroelectric sensors, piezoelectric actuators, etc. Substitution of chemically stable Zr 4+ in the place of chemically instable Ti 4+ to BaTiO 3 has the following advantages (i) preventing the escape of oxygen atoms from the lattice during high temperature sintering process, (ii) reducing the hopping between Ti 4+ and Ti 3+ thereby reducing conductivity of the material, (iii) reducing the grain size and (iv) controlling the leakage current [2,5,9]. Substitution of Zr reduces the Curie temperature of BaTiO 3 from 120°C to below the room temperature [8].…”

Section: Introductionmentioning

confidence: 99%

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

Ramesh

2016

Materials Science-Poland

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Zr substituted 0.8BaTiO 3 0.2Bi 0.5 K 0.5 TiO 3 lead free ceramic materials with a composition 0.8Ba0.2(Bi 0.5 K 0.5 )Ti 1 − x Zr x O 3 (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.

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Section: Dielectric Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Ramesh

2016

Materials Science-Poland

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“…For higher zirconium concentrations (x > 0.15) only a rhombohedral-to-cubic phase transition is observed. Furthermore, the phase transition of this system changes from a "normal" ferroelectric to a typical relaxor behavior by increasing zirconium concentration (until x = 0.75) [16][17][18][19][20][21] which is caused by the inhomogeneous distribution of [ZrO 6 ] clusters into the titanium (Ti) sites and/or by the mechanical stresses on the grains [19]. A polar cluster like behavior is obtained for Zr-rich BZT compositions (x > 0.75) [17].…”

Section: Introductionmentioning

confidence: 99%

Glassy behavior study of dysprosium doped barium zirconium titanate relaxor ferroelectric

Badapanda

2014

J Adv Ceram

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Abstract:We report the glassy behavior of dysprosium doped barium zirconium titanate single phase perovskite ceramics with general formula Ba 1x Dy 2x/3 Zr 0.25 Ti 0.75 O 3 prepared by solid-state reaction method. Temperature and frequency dependent dielectric studies of the ceramics reveal relaxor behavior. A non-Debye relaxation, which is analogous to the magnetic relaxation in spin-glass system, is observed clearly around temperature of dielectric permittivity maximum (T m ). Frequency dependence of T m governed by production of polar nano-regions is analyzed using Debye relation, Vogel-Fulcher (V-F) relation and power law. A clear change in dynamic behavior is observed by power parameter which is related to growth of interactions between polar nano-regions with different composition. Various parameters like activation energy for relaxation, freezing temperature, relaxation frequency, etc., are determined after non-linear curve fitting. Temperature dependence of dielectric constant at temperatures much higher and lower than T m is analyzed by two exponential functions, which gives an idea about the production of polar clusters at high temperature and distribution of freezing temperatures at lower temperature. Various other associated parameters are calculated by non-linear curve fitting and their significance has been explained.

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“…Barium titanate based Ba(Zr,Ti)O 3 (BZT) is one of the most important ceramic having perovskite ABO 3 structure with Zr in the A-site and Ti in the B-site. This material is an excellent candidate for variety of applications such as tunable filters, ring resonators, phase shifter, dynamic random access memories, tunable dielectric devices, multilayer ceramic capacitors, PTCR thermistors, etc [5,6] because it has local polar properties, the phase formation mechanism, dielectric and piezoelectric properties [7][8][9]. Several researchers have reported the PTCT effect in BaTiO 3 -based ferroelectric ceramics.…”

Section: Introductionmentioning

confidence: 99%

Relaxation and Conduction Mechanisms of High Tc Lead-Free Ba (Zr,Ti)O3 Positive Temperature Coefficient of Resistivity Ceramic Using Impedance Spectroscopy

Rahman

Quader²,

Hossain³

2014

IJMEA

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Abstract:High T c lead-free Ba (Zr 0.52 Ti 0.48 )O 3 positive temperature coefficient of resistivity (PTCR) ceramic was produced by the standard solid state reaction technique. X-ray diffraction pattern confirms the formation of the tetragonal perovskite structure of the ferroelectric sample. The conduction and relaxation mechanisms of the piezoelectric ceramic have been studied on the basis of activation energy. The relaxation mechanism is investigated for this sample based on the peaks of the imaginary part of electrical impedance and modulus spectra. The Cole-Cole plots indicate that the grain effect is influenced by the increase of temperature up to 200 °C and disappeared beyond this temperature. The temperature versus electrical resistivity plots show that a phase transition occurs at the Curie temperature, T c =150 °C. The ceramic exhibits a PTCR jump of almost two orders of magnitude starting at 150 °C and ending at 275 °C with a high temperature coefficient of resistivity of ~25 % per °C. The electrical resistivity measurements also reveal that the sample shows semiconducting behavior beyond 275 °C with the value of negative temperature coefficient of resistivity of ~ 0.6% per °C.

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Dielectric and ferroelectric characteristics of barium zirconate titanate ceramics prepared from mixed oxide method

Cited by 152 publications

References 13 publications

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

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

Glassy behavior study of dysprosium doped barium zirconium titanate relaxor ferroelectric

Relaxation and Conduction Mechanisms of High Tc Lead-Free Ba (Zr,Ti)O3 Positive Temperature Coefficient of Resistivity Ceramic Using Impedance Spectroscopy

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