The scanning electron acoustic microscopy investigation on ferroic materials under local stress
- PDF / 1,099,587 Bytes
- 6 Pages / 584.957 x 782.986 pts Page_size
- 48 Downloads / 193 Views
The scanning electron acoustic microscopy investigation on ferroic materials under local stress Hongzhang Song,a) Yongxiang Li, Kunyu Zhao, Huarong Zeng, Guorong Li, and Qingrui Yin State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China (Received 1 October 2008; accepted 21 April 2009)
In this paper, the responses in the microregion of three ferroic-type materials, such as ferroelectric single crystals (PMN-PT and BaTiO3), ferromagnetic alloy (Fe81Ga19), and ferroelastic alloy (Ni53Mn24Ga23), to local stress induced by Vickers indentations were studied using scanning electron-acoustic microscopy (SEAM), a powerful technique for nondestructive investigation of the microstructure of materials. The responses of ferroelectric domains, magnetic domains, and ferroelastic domains to local stress were successfully observed. These responses possess three major features including the plastic deformation underneath the indenter, the extension of microcracks induced by indentation, and the formation of new lamellar domains within the matrix domain structure. In addition, by using the unique ability of SEAM to image layer by layer, the distributions of residual stress at different depths were obtained. The generation mechanisms of the electron acoustic signals of ferroelectric domains, magnetic domains, and ferroelastic domains are discussed. I. INTRODUCTION
The ferroic materials (ferroelectric, ferromagnetic, and ferroelastic/martensitic) are important functional materials. Despite the difference in their physical origins, they share remarkable similarities with each other. It is well known that the microscopic domain structure is the key issue to understanding the fundamentals of ferroic materials. Recently, the domain reorientation and other interesting phenomena induced by local stress have attracted much attention because they contribute to the changes of ferroic properties. The domain switching and the particular cleavage plane in poled BaTiO3 single crystals using cross-polarized light were reported.1–4 Liu et al.5 studied the plastic deformation behavior and the dislocation influence on domain walls in unpoled BaTiO3 single crystals by an atom force microscopy (AFM) and a piezoresponse force microscopy (PFM). The indentation-induced domain switching a)
Address all correspondence to this author. e-mail: [email protected] This paper was selected as an Outstanding Symposium Paper for the 2008 International Materials Research Conference, Symposium F. To maintain JMR’s rigorous, unbiased peer review standards, the JMR Principal Editor and reviewers were not made aware of the paper’s designation as Outstanding Symposium Paper. DOI: 10.1557/JMR.2009.0269 J. Mater. Res., Vol. 24, No. 7, Jul 2009
http://journals.cambridge.org
Downloaded: 26 Mar 2015
and butterfly switching zone in both poled and unpoled 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 (PMN–35PT) single crystals were investigated by using polarized light mic
Data Loading...
