An orthorhombic pseudo-cubic phase transition by approaching the Landau symmetrical impact of piezoelectric and ferroelectric properties in novel NaNbO3-based solid solutions

• Published in: Journal of materials research 2023-05, Vol.38 (9), p.2463-2473
• Main Authors: Elaiyaraja, P., Karunagaran, N.
• Format: Article
• Language: English
• Subjects: Absorption spectra; Applied and Technical Physics; Biomaterials; Chemistry and Materials Science; Chromaticity; Ferroelectric materials; Ferroelectricity; Frequency ranges; Inorganic Chemistry; Lead free; Materials Engineering; Materials research; Materials Science; Mathematical analysis; Nanotechnology; Optical properties; Perovskite structure; Perovskites; Phase transitions; Piezoelectricity; Raman spectroscopy; Sodium compounds; Solid solutions
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/s43578-023-00976-0

A new series of (1 –  x )NaNbO 3 – x Bi 0.45 Gd 0.05 K 0.5 ZrO 3 lead-free piezoelectric composite has been identified to enhance the electrical and optical characteristics of the material by solid-state reaction (SSR). The perovskite structure was confirmed by X-ray diffraction and Raman spectroscopy, and the phase transition from orthorhombic to pseudo-cubic was observed under intense examination. A considerable shift in the electrical and optical band gap due to structural destruction is indicated by UV–Vis absorption spectra. The CIE chromaticity coordinates were calculated using the luminescence spectra. Dielectric parameters have been studied in a temperature range of 40–500 °C at a frequency range of 1 kHz to 1 MHz. Furthermore, the ferroelectric and piezoelectric properties of all the samples of (1 –  x )NaNbO 3 – x Bi 0.45 Gd 0.05 K 0.5 ZrO 3 have been studied, the composition x  = 0.02 have the optimal piezoelectric value of 153 pC/N and their properties were explained through the Landau phase transition theory. Graphical abstract