Absence of toughening behavior in 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 relaxor ceramic. (15th July 2017)

• Record Type: Journal Article
• Authors: Vögler, M.; Daniels, J.E.; Webber, K.G.; Rödel, J.
• Is Part Of: Scripta materialia. Number 136(2017)
• Page Start: 115
• Page End: 119
• Publication Date: 2017-07-15
• Subjects: Relaxor -- Fracture toughness -- Lead-free -- NBT-BT -- Ferroelectric; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.04.023
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The fracture behavior of the unpoled 0.94(Na1/2 Bi1/2 )TiO3 -0.06BaTiO3 relaxor ferroelectric was investigated. Previous studies indicated that a metastable ferroelectric long-range order can be induced by mechanical stresses, which could lead to a crack tip process zone and increasing crack resistance during crack growth. Crack propagation in compact tension samples yielded a constant crack resistance as function of crack length. This is consistent with ex situ x-ray diffraction experiments, where a remanent induced process zone on the fracture surface could not be detected. We suggest the very high transformation stress, determined via macroscopic stress-strain measurements, is responsible for the absence of toughening. Graphical abstract: