resumo
The 'x' wt% (x = 0, 0.02, 0.04 and 0.06) Pr6O11 modified Ba0.98Ca0.02Zr0.02Ti0.98O3 (BCZT - x Pr) piezoelectric ceramics have been fabricated by the solid state reaction method with sintering at 145 degrees C (x = 0) and 1350 degrees C (0.02 <= x <= 0.06) for 2 h. The impact of Pr concentration on the structural, microstructural, photoluminescence and ferroelectric properties has been systematically investigated. The x-ray diffraction (XRD) patterns revealed the co-existence of tetragonal and orthorhombic phases at room temperature upto x = 0.04 Pr concentration. The grain size was found to decrease upto x = 0.04 Pr content. Room temperature Raman spectroscopy results were consistent with the XRD results. The photoluminescence (PL) spectra showed significant emissions consisting of strong blue (489 nm), green (528 nm) and red (649 nm) wavelengths. The emission intensities of PL spectrum were strongly Pr concentration dependent and a maximum value was obtained for 0.04 Pr modified BCZT ceramic. Further, a large remnant polarization (2P(r) similar to 13 mu C/cm(2)) and low coercive field (E-c similar to 22 V/cm) were obtained for BCZT - 0.04 Pr ceramic. The crystal structure and microstructure affect the photoluminescence and ferroelectric properties. Such properties of 0.04 Pr modified BCZT ceramic make it the potential candidate for novel integrated and multifunctional devices.
palavras-chave
FREE PIEZOELECTRIC CERAMICS; ELECTRICAL-PROPERTIES; SINTERING TEMPERATURE; LUMINESCENCE; POLARIZATION; EMISSION; STATE
categoria
Materials Science
autores
Ramovatar; Coondoo, I; Satapathy, S; Panwar, N
nossos autores
Indrani Coondoo
Investigador Júnioragradecimentos
The authors Ramovatar and I.C. would like to thank the University Grant Commission, New Delhi for providing the Rajiv Gandhi National Fellowship (RGNF) and FCT, Portugal, through SFRH/BPD/81032/2011, respectively.