Dielectric and piezoelectric properties of Mn-doped (K,Na)0.96Sr0.02NbO3ceramics
| Autor: | Wen Xiu Cheng, P. S. Qiu, Aili Ding, Tian-Ying Liu, Xinsen Zheng, X. Y. He |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Diffraction
Chemistry Doping Analytical chemistry Sintering Surfaces and Interfaces Dielectric Condensed Matter Physics Microstructure Piezoelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nuclear magnetic resonance visual_art Materials Chemistry visual_art.visual_art_medium Dissipation factor Ceramic Electrical and Electronic Engineering |
| Zdroj: | physica status solidi (a). 203:3861-3867 |
| ISSN: | 1862-6319 1862-6300 |
| DOI: | 10.1002/pssa.200622321 |
| Popis: | Dense, lead-free ceramics with composition of (K0.5Na0.5)0.96Sr0.02Nb1–xMnxO3 (x = 0, 0.01, 0.02, 0.03, 0.04) were successfully prepared by a conventional mixed-oxide method. The X-ray diffraction patterns revealed pure peroveskite structure after Mn doping as compared to the original composition. This was attributed to the inhibition of K+ volatility during the sintering process. A dielectric anomaly was observed and explained by a multiple-cell structure resulting from Mn-induced lattice distortion. Low loss tangent and relatively high planar electromechanical coupling factor were obtained at x = 0.02. The main parameters for the composition of x = 0.02 are: eT33/e0 = 479, d33 = 121 pC/N, Kp = 41%, Qm = 298, tan δ = 1.6%, Tc = 391 °C. The rates of resonant frequency variation, α, and planar coupling factor variation, α, with a temperature of 80 °C are –1.85% and +1.19%, respectively. This material may be suitable for applica- tions in ultrasonic transducers. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Databáze: | OpenAIRE |
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