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Uwiragiye, Eugenie,Farooq, Muhammad Umer,Moon, Su-Hyun,Pham, Thuy Linh,Nguyen, Dang Thanh,Lee, Jong-Sook,Fisher, John G. Elsevier 2017 Journal of the European Ceramic Society Vol.37 No.15
<P><B>Abstract</B></P> <P>0.96(K<SUB>0.48</SUB>Na<SUB>0.52</SUB>)NbO<SUB>3</SUB>-0.03[Bi<SUB>0.5</SUB>(Na<SUB>0.7</SUB>K<SUB>0.2</SUB>Li<SUB>0.1</SUB>)<SUB>0.5</SUB>]ZrO<SUB>3</SUB>-0.01(Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>)TiO<SUB>3</SUB> single crystals were grown for the first time by the solid state crystal growth method, using [001] or [110]-oriented KTaO<SUB>3</SUB> seed crystals. The grown single crystal shows a dielectric constant of 2720 and polarization-electric field loops of a lossy normal ferroelectric, with P<SUB>r</SUB> =45μC/cm<SUP>2</SUP> and E<SUB>c</SUB> =14.9kV/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 ∼150°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.</P>