Nanostructured Ceramics of Potassium Sodium Bismuth Titanate: Hydrothermal Synthesis and Piezoelectric Response at Morphotropic Phase Boundary — Oak Academic Publishing
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Nanostructured Ceramics of Potassium Sodium Bismuth Titanate: Hydrothermal Synthesis and Piezoelectric Response at Morphotropic Phase Boundary
Department of Instrumentation, Cochin University of Science and Technology, Cochin, India
,
Department of Instrumentation, Cochin University of Science and Technology, Cochin, India
,
Department of Physics, PSMO College Tirurangadi, Tirurangadi, India
,
Amal Jyothi College of Engineering, Kottayam, India
1 Department of Instrumentation, Cochin University of Science and Technology, Cochin, India
2 Department of Instrumentation, Cochin University of Science and Technology, Cochin, India
3 Department of Physics, PSMO College Tirurangadi, Tirurangadi, India
4 Amal Jyothi College of Engineering, Kottayam, India
Potassium Sodium Bismuth Titanate (KNBT) ceramics, with the general formula (1 - x )K 0.5 Bi 0.5 TiO 3 - x Na 0.5 Bi 0.5 TiO 3 , have been synthesized following hydrothermal route, starting with solid solutions of pure perovskite nanoceramics of KBT and NBT in desired stoichiometric weight ratios, followed by sintering between 850 ° C and 1000 ° C for few hours. Pure KNBT nanoceramics with perovskite structure, having mean particle size around 30 nm, could be obtained. Morphology of the samples is found to depend strongly on composition. A change of composition results in a phase change, as evident from X-ray structure analysis. This phase change is a result of rhombohedral to tetragonal morphotropic phase boundary (MPB) in the sample with x around 0.80. Composition dependent occurrence of MPB leads to formation of needle like structures with micrometer length scales. These are typical of tetragonal lamellar structures, suggesting partial induction of tetragonal polar order from rhombohedral structure at MPB. Dielectric and piezoelectric properties, such as dielectric constant and loss, piezoelectric coefficients and figures of merit, exhibit threshold maxima in their values at the composition corresponding to MPB. These values reported for a lead-free piezoceramic, synthesized by a comparatively simple hydrothermal route, are highly promising, and comparable to well-known PZT.
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