Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440317 | Journal of the European Ceramic Society | 2017 | 11 Pages |
Abstract
0.96(K0.48Na0.52)NbO3-0.03[Bi0.5(Na0.7K0.2Li0.1)0.5]ZrO3-0.01(Bi0.5Na0.5)TiO3 single crystals were grown for the first time by the solid state crystal growth method, using [001] or [110]-oriented KTaO3 seed crystals. The grown single crystal shows a dielectric constant of 2720 and polarization-electric field loops of a lossy normal ferroelectric, with Pr = 45 μC/cm2 and Ec = 14.9 kV/cm, while the polycrystalline samples with a dielectric constant of 828 were too leaky for P-E measurement due to humidity effects. The single crystal has orthorhombic symmetry at room temperature. Dielectric permittivity peaks at 26 °C and 311 °C, respectively, are attributed to rhombohedral-orthorhombic and tetragonal-cubic phase transitions. Additionally, Raman scattering shows the presence of an orthorhombic-tetragonal phase transition at â¼150 °C, which is not indicated in the permittivity curves but by the loss tangent anomalies. A transition around 700 °C in the high temperature dc conductivity is suggested to be a ferroelastic-paraelastic transition.
Keywords
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Eugenie Uwiragiye, Muhammad Umer Farooq, Su-Hyun Moon, Thuy Linh Pham, Dang Thanh Nguyen, Jong-Sook Lee, John G. Fisher,