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Temperature-dependent R-curve behavior of the lead-free ferroelectric 0.615Ba(Zr0.2Ti0.8)O3–0.385(Ba0.7Ca0.3)TiO3 ceramic

Vögler, Malte and Acosta, Matias and Brandt, David R. J. and Molina-Luna, Leopoldo and Webber, Kyle G. (2015):
Temperature-dependent R-curve behavior of the lead-free ferroelectric 0.615Ba(Zr0.2Ti0.8)O3–0.385(Ba0.7Ca0.3)TiO3 ceramic.
In: Engineering Fracture Mechanics, pp. 68-77, 144, ISSN 00137944,
[Online-Edition: http://dx.doi.org/10.1016/j.engfracmech.2015.06.069],
[Article]

Abstract

The temperature-dependent crack growth resistance behavior of the lead-free (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 (x = 0.385) ceramic was characterized using compact-tension specimens from 25 °C to 60 °C. The observed plateau fracture toughness at 25 °C was found to be approximately 37% lower than commercial Pb(Zr,Ti)O3. At elevated temperature, the maximum fracture toughness displayed a decrease, which was found to be related to the temperature-dependent elastic and ferroelastic properties. Mechanical measurements are presented that demonstrate decreasing effective switching strain, coercive stress and Young’s modulus with increasing temperature.

Item Type: Article
Erschienen: 2015
Creators: Vögler, Malte and Acosta, Matias and Brandt, David R. J. and Molina-Luna, Leopoldo and Webber, Kyle G.
Title: Temperature-dependent R-curve behavior of the lead-free ferroelectric 0.615Ba(Zr0.2Ti0.8)O3–0.385(Ba0.7Ca0.3)TiO3 ceramic
Language: English
Abstract:

The temperature-dependent crack growth resistance behavior of the lead-free (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 (x = 0.385) ceramic was characterized using compact-tension specimens from 25 °C to 60 °C. The observed plateau fracture toughness at 25 °C was found to be approximately 37% lower than commercial Pb(Zr,Ti)O3. At elevated temperature, the maximum fracture toughness displayed a decrease, which was found to be related to the temperature-dependent elastic and ferroelastic properties. Mechanical measurements are presented that demonstrate decreasing effective switching strain, coercive stress and Young’s modulus with increasing temperature.

Journal or Publication Title: Engineering Fracture Mechanics
Volume: 144
Uncontrolled Keywords: Fracture mechanics; Crack growth; R-curve; BZT–BCT; Ferroelasticity
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 06 Jul 2015 11:02
Official URL: http://dx.doi.org/10.1016/j.engfracmech.2015.06.069
Identification Number: doi:10.1016/j.engfracmech.2015.06.069
Funders: This work was supported by the Deutsche Forschungsgemeinschaft through the Sonderforschungsbereich 595 “Electrical Fatigue in Functional Materials” and the AdRIA Hesse state center for Adaptronics., K.G.W. gratefully acknowledges the financial support of the Deutsche Forschungsgemeinschaft through WE4972/2-1.
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