Phase structures and electrical properties of new lead-free (Na0.5K0.5)NbO3–(Bi0.5Na0.5)TiO3 ceramics

Highly dense (1−x)(Na0.5K0.5)NbO3–x(Bi0.5Na0.5)TiO3 (NKN-BST) solid solution piezoelectric ceramics have been fabricated by ordinary sintering. All compositions show pure perovskite structures, showing room-temperature symmetries of orthorhombic at x⩽0.02, of tetragonal at 0.03⩽x⩽0.09, of cubic at 0.09 0.20. A morphotropic phase boundary (MPB) between orthorhombic and tetragonal ferroelectric phases was identified in the composition range of 0.02

Keywords:

• Condensed matter physics
• Analytical chemistry
• Ferroelectric ceramics
• Ceramic
• Titanate
• Curie temperature
• Tetragonal crystal system
• Orthorhombic crystal system
• Physics
• Piezoelectricity
• Mineralogy
• Ferroelectricity
• Composite material

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