High spatial resolution structure of (K,Na)NbO3 lead-free ferroelectric domains

Fernando Rubio-Marcos; Adolfo Del Campo; Rigoberto López-Juárez; Juan J. Romero; José F. Fernández

doi:10.1039/C2JM30483J

High spatial resolution structure of (K,Na)NbO₃ lead-free ferroelectric domains†

Fernando Rubio-Marcos,*^a Adolfo Del Campo,^a Rigoberto López-Juárez,^b Juan J. Romero^a and José F. Fernández^a

* Corresponding authors

^a Electroceramic Department, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain
E-mail: frmarcos@icv.csic.es

^b Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, A.P. 70-186, Coyoacán, México D.F, México

Abstract

In this paper, we highlight some practical aspects in the study of ferroelectric domains in lead-free (K,Na)NbO₃ piezoceramics. This work presents and discusses the spatial resolved structure of the ferroelectric domain existing in (K,Na)NbO₃ based ceramics studied by confocal Raman microscopy (CRM) coupled with atomic force microscopy. In addition to the domain identification, CRM allows a determination of the nature of domain walls and correlation between the structure and piezoelectric properties. The tetragonal constraint for orthorhombic domain formations is demonstrated by this technique. Alternating polarization differences in 180° domain templates are resolved by 60° and 120° domains. The internal stress results in the appearance of an unusual polarization relaxation at the 90° domain wall in (K,Na)NbO₃ ceramics. Finally, the implications of the present findings introduce a fruitful discussion in the search for effective structures to improve the piezoelectric response and represent the key point to design new domains that allow engineering the piezoelectric response.

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Article information

DOI: https://doi.org/10.1039/C2JM30483J
Article type: Paper
Submitted: 25 Jan 2012
Accepted: 07 Mar 2012
First published: 09 Mar 2012

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J. Mater. Chem., 2012,22, 9714-9720

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High spatial resolution structure of (K,Na)NbO₃ lead-free ferroelectric domains

F. Rubio-Marcos, A. Del Campo, R. López-Juárez, J. J. Romero and J. F. Fernández, J. Mater. Chem., 2012, 22, 9714 DOI: 10.1039/C2JM30483J

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Journal of Materials Chemistry