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Crack growth resistance behavior of lanthanum doped bismuth ferrite–lead titanate: Effect of tetragonality and mixed phase crystal structures

Leist, Thorsten and Brötz, Joachim and Seo, Yo-Han and Cheng, Shumeng and Webber, Kyle G. (2012):
Crack growth resistance behavior of lanthanum doped bismuth ferrite–lead titanate: Effect of tetragonality and mixed phase crystal structures.
In: Engineering Fracture Mechanics, Elsevier Science Publishing Company, pp. 267-275, 96, ISSN 00137944,
[Online-Edition: http://dx.doi.org/10.1016/j.engfracmech.2012.08.008],
[Article]

Abstract

The room temperature crack growth resistance behavior of polycrystalline lanthanum-doped bismuth ferrite-lead titanate was characterized with disc compact-tension specimens. Through lanthanum doping the tetragonality can be adjusted from 1.01 to 1.10, while retaining a mixed phase system. Experimental measurements show changes in toughening behavior with increasing c/a ratio. Fracture results are discussed in conjunction with macroscopic ferroelastic constitutive behavior and stress-dependent neutron diffraction measurements to elucidate the role of a mixed phase system with heterogeneous mechanical properties. Additional X-ray diffraction measurements were performed to determine the effect of possible crack-tip stress-induced phase transformations on R-curve behavior.

Item Type: Article
Erschienen: 2012
Creators: Leist, Thorsten and Brötz, Joachim and Seo, Yo-Han and Cheng, Shumeng and Webber, Kyle G.
Title: Crack growth resistance behavior of lanthanum doped bismuth ferrite–lead titanate: Effect of tetragonality and mixed phase crystal structures
Language: English
Abstract:

The room temperature crack growth resistance behavior of polycrystalline lanthanum-doped bismuth ferrite-lead titanate was characterized with disc compact-tension specimens. Through lanthanum doping the tetragonality can be adjusted from 1.01 to 1.10, while retaining a mixed phase system. Experimental measurements show changes in toughening behavior with increasing c/a ratio. Fracture results are discussed in conjunction with macroscopic ferroelastic constitutive behavior and stress-dependent neutron diffraction measurements to elucidate the role of a mixed phase system with heterogeneous mechanical properties. Additional X-ray diffraction measurements were performed to determine the effect of possible crack-tip stress-induced phase transformations on R-curve behavior.

Journal or Publication Title: Engineering Fracture Mechanics
Volume: 96
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Ferroelastic toughening; Fracture of ferroelectrics; Ferroelasticity; Process zone
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 > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 19 Nov 2012 09:44
Official URL: http://dx.doi.org/10.1016/j.engfracmech.2012.08.008
Identification Number: doi:10.1016/j.engfracmech.2012.08.008
Funders: We are grateful to Deutsche Forschungsgemeinschaft for financing this work under Contract Number RO 954/20.
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