Effect of MnO on the Phase Development, Microstructures, and Dielectric Properties of 0.95Na0.5K0.5NbO3–0.05LiTaO3 Ceramics期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Effect of MnO on the Phase Development, Microstructures, and Dielectric Properties of 0.95Na_0.5K_0.5NbO₃–0.05LiTaO₃ Ceramics

Authors:	Pornsuda Bomlai Penprapa Sinsap Supasarute Muensit Steven J Milne

Affiliation:	Materials Science Program, Prince of Songkla University, Songkhla 90112, Thailand; NANOTEC Center of Excellence, Prince of Songkla University, Songkhla 90112, Thailand; Department of Physics, Faculty of Science, Prince of Songkla University, Songkhla 90112, Thailand; Institute for Materials Research, University of Leeds, Leeds LS2 9JT, UK

Abstract:	Lead-free piezoelectric ceramics in the system 0.95Na_0.5K_0.5NbO₃–0.05LiTaO₃ were modified with ≤1 mol% MnO. Maximum densities occurred at a sintering temperature of 1050°C. Characteristic changes in the relative intensity of X-ray diffraction peaks were consistent with Mn ions substituting on the perovskite lattice to produce a change from orthorhombic to a mixture of tetragonal and orthorhombic phases. Grain growth during secondary recrystallization was also affected, leading to increased grain sizes. The dielectric constant increased from ～600 in unmodified ceramics to ～1040 in ceramics prepared with 0.5 mol% MnO.

Keywords: