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piezoceramic
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Synthesis and Investigation of Properties of (K,Na)NbO3-Based Piezoelectrics
, M.Sc. Thesis Sharif University of Technology ; Nemati, Ali (Supervisor) ; Faghihi Sani, Mohammad Ali (Supervisor)
Abstract
The fabrication of potassium sodium niobate piezoceramic with oriented microstructure and study of its piezoelectric properties is one of the main objectives of the present study. For this purpose, first the raw materials were synthesized. solid state reaction and topochemical reaction were used for the synthesis of potassium sodium niobate and sodium niobate respectively. The X-ray diffraction results determined that the powder synthesized by the solid state method in the binary system KNbO3-NaNbO3 is closer to the morphotropic phase boundary compared to the powder synthesized in the ternary system Na2CO3-K2CO3-Nb2O5. Particles morphology also includes coarse cubic shape and small equiaxed...
Fabrication and characterization of KNN Piezoelectrics
, M.Sc. Thesis Sharif University of Technology ; Khachatourian, Adrineh Malek (Supervisor) ; Golmohammad, Mohammad (Supervisor)
Abstract
Due to the environmental problems of lead and the prohibition of its use, lead-free piezoceramic sodium-potassium niobate, KNN, are one of the main candidates to replace lead-containing piezoceramics, PZTs. High Curie temperature, low density, and compatibility with nickel electrodes are its distinguishing features from other piezoelectric materials. The crystal structure of this material varies with temperature and includes rhombohedral, orthorhombic, tetragonal, and cubic. Various synthesis and manufacturing methods including hydrothermal, solid-state reaction, sol-gel, molten salt, etc. are used for this material. In this research, the hydrothermal synthesis method is used due to its high...