Phase transition behavior and electrical properties of lead-free (1-x)KNLNS-xBNKZ piezoelectric ceramics
| Autor: | Le Dai Vuong, Vo ThanhTung, Phan Dinh Gio |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Materials science Analytical chemistry Crystal structure Condensed Matter Physics Microstructure Ferroelectricity Electronic Optical and Magnetic Materials Tetragonal crystal system Mechanics of Materials Phase (matter) visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Orthorhombic crystal system Ceramic Electrical and Electronic Engineering |
| Zdroj: | Journal of Electroceramics. 46:107-114 |
| ISSN: | 1573-8663 1385-3449 |
| DOI: | 10.1007/s10832-021-00249-4 |
| Popis: | Lead-free (1-x)(K0,48Na0,48Li0,04)(Nb0,95Sb0,05)O3-xBi0.5(Na0.82K0.18)0.5ZrO3 (KNLNS-xBNKZ) piezoelectric ceramics (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.1) were successfully prepared by the two-step sintering method. The effects of different BNKZ contents on the crystal structure, ferroelectric phase transition, and electrical properties of the as-prepared ceramics were systematically researched. The ceramics with a perovskite structure possessed an orthorhombic phase (space group = Amm2) at x = 0, a mixed orthorhombic-tetragonal phase (Amm2 + P4/mbm) at x = 0.02, a mixed rhombohedral-tetragonal (R-T) phase (R3m + P4/mbm) at x = 0.04–0.06, and a rhombohedral phase (R3m) at x>0.06. At x = 0.04 (rhombohedral and tetragonal (R-T) phases coexisted), the ceramics manifested the best electrical properties with d33 = 224 pC/N, kp = 0.44, kt = 0.47, TC = 218oC, and remanent polarization (Pr) = 11.5µC/cm2. The improvement of the electrical properties of KNLNS-BNKZ ceramics was achieved by controlling their phase compositions and microstructures. |
| Databáze: | OpenAIRE |
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