Journal ArticleDOI
Influence of Grain Size on Ferroelastic Toughening and Piezoelectric Behavior of Lead Zirconate Titanate
Zhiwu Zhang,Rishi Raj +1 more
TLDR
A tensor representation for the fracture toughness, now a function of the crack plane normal and the poling direction, is developed in this paper, where the maximum and minimum values in the toughness tensor are related to the unpoled toughness by a simple phenomenological relationship.Abstract:
Lead zirconate titanate specimens, at composition Zr 48.9±1.0 /Ti 51.1±1.0 , of grain sizes ranging from 0.5 to 15 μm were prepared by hot pressing. The fracture toughness showed a 40% increase in the fine-grained specimens. Poling produced anisotropy in the fracture toughness. A tensor representation for the fracture toughness, now a function of the crack plane normal and the poling direction, is developed. The maximum and minimum values in the toughness tensor are shown to be related to the unpoled toughness by a simple phenomenological relationship. We also find that the piezoelectric coefficient, d 33 , shows a slight increase for the fine-grained specimens, which is in conflict with the general view that smaller-grained materials can sustain vanishingly small values of spontaneous polarization.read more
Citations
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Journal ArticleDOI
Dielectric Properties of Fine-Grained Barium Titanate Based X7R Materials
Sea-Fue Wang,Gordon O. Dayton +1 more
TL;DR: In this article, a fine-grained BaTiO3 powder with precipitation-coated additive was used to obtain the temperature coefficient of capacitance (TCC) and the dissipation factor (DF) as a function of active layer thickness.
Journal ArticleDOI
R-curve behaviour of BaTiO3 due to stress-induced ferroelastic domain switching
TL;DR: In this article, a qualitative process zone model is proposed to explain the effect of ferroelastic domain switching on the R-curve of the barium titanate in CT-specimens.
Journal ArticleDOI
Effect of rare earth (Er, Gd, Eu, Nd and La) and bismuth additives on the mechanical and piezoelectric properties of lead zirconate titanate ceramics
Ajai Garg,D. C. Agrawal +1 more
TL;DR: In this article, the mechanical, piezoelectric and dielectric properties of PZT ceramics (Pb 0.98 M 0.02 [(Zr 0.535 Ti 0.465 ) 0.995 ]O 3, M=Er, Gd, Eu, Nd, La and Bi) have been studied.
Journal ArticleDOI
Effect of Heating Rate on the Sintering Behavior and the Piezoelectric Properties of Lead Zirconate Titanate Ceramics
TL;DR: In this article, the effect of heating rate on the sintering behavior and the piezoelectric properties of lead zirconate titanate (PZT) ceramics was investigated.
Journal ArticleDOI
R-curve behavior of BaTiO3- and PZT ceramics under the influence of an electric field applied parallel to the crack front
TL;DR: In this article, the fracture resistance curves (R-curves) of BaTiO3 and commercial PZT-PIC 151 were measured with compact tension specimens under the influence of an electric field applied parallel to the crack front.
References
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Journal ArticleDOI
A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: I, Direct Crack Measurements
TL;DR: In this paper, the application of indentation techniques to the evaluation of fracture toughness is examined critically, in two parts: the first part is focused on an approach which involves direct measurement of Vickers-produced radial cracks as a function of the indentation load.
A Critical evaluation of indentation techniques for measuring fracture toughness
TL;DR: In this paper, the application of indentation techniques to the evaluation of fracture toughness is examined critically, in two parts: the first part is focused on an approach which involves direct measurement of Vickers-produced radial cracks as a function of the indentation load.
Journal ArticleDOI
Elastic/Plastic Indentation Damage in Ceramics: The Median/Radial Crack System
TL;DR: In this article, a theory for describing the evolution of the median/radial crack system in the far field of sharp-indenter contacts is developed, based on a model in which the complex elastic/plastic field beneath the indenter is resolved into elastic and residual components.
Journal ArticleDOI
Fabrication of perovskite lead magnesium niobate
S. L. Swartz,Thomas R. Shrout +1 more
TL;DR: The perovskite relaxor ferroelectric lead magnesium niobate (PbMg 1 3 Nb 2 3 O 3 ) is an important material because of its high dielectric constant and correspondingly large electrostrictive strains as mentioned in this paper.
Journal ArticleDOI
Twinning in ferroelectric and ferroelastic ceramics: stress relief
TL;DR: In this article, a semi-quantitative model is developed with the example of BaTiO3 ceramic, of which the domain patterns are well known. But this model is restricted to two dimensions only.
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Fracture Mechanisms in Ferroelectric‐Ferroelastic Lead Zirconate Titanate (Zr: Ti=0.54:0.46) Ceramics
Karun Mehta,Anil V. Virkar +1 more