Non-Debye dielectric dispersion of barium titanate stannate in the relaxor and diffuse phase-transition state

Mueller, Volkmar; Beige, H.; Abicht, Hans‐Peter

doi:10.1063/1.1649820

Cited by 72 publications

(35 citation statements)

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“…Similar observation has also been reported in BaTi 1Àx Sn x O 3 with x < 15% assigned to the nonrelaxor DPTferroelectric characteristics. 38,39 The broadness or diffusiveness in such materials occurs mainly due to the compositional fluctuation and/or structural disordering in the arrangement of cation(s) in one or more crystallographic sites causing a microscopic heterogeneity in the compound with different local Curie points. Besides compositional fluctuation, mechanical stress in the grain (generally introduced in the lattice during post sintering cooling, wherein a transition from cubic to tetragonal phase occurs below T m ) also plays a role in diffuseness of the permittivity near T m .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramic

Coondoo

Panwar

Amorín

et al. 2013

Journal of Applied Physics

108

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Articles you may be interested inSymmetry determination on Pb-free piezoceramic 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 using convergent beam electron diffraction method J. Appl. Phys. 115, 054108 (2014) Temperature dependent dielectric permittivity studies demonstrated frequency independent behavior, indicating that the studied sample was not a typical relaxor ferroelectric. A polymorphic phase transition between rhombohedral and tetragonal phase was noticed near room temperature followed by a tetragonal to cubic transition with 97 C as the temperature of maximum permittivity. The macroscopic values of d 33 and d 31 were $350 pC/N and À141 pm/V, whereas the electromechanical coupling factors k p and k t were 44.5% and 41.6%, respectively. Bulk P-E hysteresis loop was obtained with saturation polarization 11 lC/cm 2 and coercive field $4 kV/cm. Distinct polarization contrast with a complex mosaic-like domain structure was observed in the out-of-plane mode of piezoresponse force microscopy. The domain width and the correlation length were estimated to be nearly 2 lm and 827 nm, respectively. Local hysteresis loop with apparent coercive voltage, V c ¼ 15.8 V, was observed. V C 2013 AIP Publishing LLC. [http://dx

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramic

Coondoo

Panwar

Amorín

et al. 2013

Journal of Applied Physics

108

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“…[1][2][3][4] Actually, systems showing a broad dielectric peak at the frequency-independent peak temperature T m are different from the relaxor-type DPTs. 1,4 In typical relaxors, strong frequency dispersion in dielectric permittivity is observed at the low temperature side of the dielectric peak, while the high temperature permittivity is almost frequency independent. The temperature for maximum permittivity T m shifts to higher values with increasing frequencies following the Vogel-Fulcher law.…”

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confidence: 99%

Lorentz-type relationship of the temperature dependent dielectric permittivity in ferroelectrics with diffuse phase transition

Ke¹,

Fan²,

Huang³

et al. 2008

Applied Physics Letters

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The temperature dependence of the dielectric permittivity of perovskite Ba͑Zr x Ti 1−x ͒O 3 solid solutions, PbMg 1/3 Nb 2/3 O 3 relaxor, and BaTiO 3 ferroelectric ceramics was measured. It is found that a Lorentz-type law can be used to describe the dielectric permittivity of either the normal ferroelectrics with or without diffuse phase transitions ͑DPT͒ or the typical ferroelectric relaxors. The ferroelectric DPT can be well described by just one fitting process using the Lorentz-type law, while the relaxor ferroelectric transition needs two independent fitting processes. The Lorentz-type law fails at the low temperature side of the dielectric maximum of a first-order ferroelectric phase transition. Above the transition temperature, the dielectric curves of all the studied materials can be well described by a Lorentz-type law. © 2008 American Institute of Physics. ͓DOI: 10.1063/1.2987733͔A broad peak in the temperature dependence of dielectric permittivity is the main feature of ferroelectrics with a diffuse phase transition ͑DPT͒, especially for ferroelectric relaxors. [1][2][3][4] Actually, systems showing a broad dielectric peak at the frequency-independent peak temperature T m are different from the relaxor-type DPTs. 1,4 In typical relaxors, strong frequency dispersion in dielectric permittivity is observed at the low temperature side of the dielectric peak, while the high temperature permittivity is almost frequency independent. The temperature for maximum permittivity T m shifts to higher values with increasing frequencies following the Vogel-Fulcher law. 3 For a ferroelectric phase transition, the Curie-Weiss law 1 / = ͑T − T C ͒ / C is known to describe the high temperature side of the sharp permittivity peak in normal ferroelectrics. However, in ferroelectrics with DPT this law is observed only at temperatures significantly higher than T m ͓over 300 K for PbMg 1/3 Nb 2/3 O 3 ͑PMN͔͒. 1,2 When the temperature is decreased below the Burn's temperature T B , polar nanoregions ͑PNRs͒ appear and the displacive-type soft mode is overdamped. 5 The Curie-Weiss law becomes invalid within the temperature range of T m -T B .Since Smolenskii's 6 work, the temperature dependence of the dielectric permittivity above T m has been widely studied in order to find out the characteristic dielectric behavior of ferroelectrics with DFT. There are several models to quantitatively describe the temperature dependent dielectric permittivity of DPT. A brief review of these models has been given by Bokov and Ye. 7 Among these models, the following power law 8,9 is the most popular one:where the parameters ␥ and ␦ reflect the diffuseness of dielectric relaxation. Normally, ␥ = 1 describes a Curie-Weiss behavior of normal ferroelectrics, while ␥ = 2 is valid for a classical ferroelectric relaxor. 8 It should be mentioned that the maximum permittivity m and the temperature at maximum permittivity T m are frequency-dependent quantities for relaxors. So the parameters ␦ and ␥ also depend on frequency, and therefore Eq. ͑1͒ is not a...

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“…One important characteristic for a material to be suitable for dielectric bolometer (DB) mode of infrared sensor applications is to have a large (Mueller et al, 2004;Lu et al, 2004;Yasuda et al, 1996;Xiaoyong et al, 2003). Moreover, Yasuda and al.…”

Section: Preparation and Characterization Of Bts Thin Films For Dielementioning

confidence: 99%

Barium Titanate-Based Materials – a Window of Application Opportunities

Popovici¹,

Okuyama²,

Akedo³

2011

Ferroelectrics - Material Aspects

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Non-Debye dielectric dispersion of barium titanate stannate in the relaxor and diffuse phase-transition state

Cited by 72 publications

References 16 publications

Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramic

Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramic

Lorentz-type relationship of the temperature dependent dielectric permittivity in ferroelectrics with diffuse phase transition

Barium Titanate-Based Materials – a Window of Application Opportunities

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