Dopant Induced Crystallographic Texturing improves Piezoelectric Property of Sodium Potassium Niobate Based Ceramics

Published on : Nov 06, 2019

Albany, New York, November 6, 2019: Lead-free piezoelectric ceramics have gained significance over lead-based materials as Lead induces high toxicity that results in tight regulations. Lead-free piezoelectric ceramics give tough competition to various lead-based ceramics’ properties such as dielectric, ferroelectric and piezoelectric property and reduce environmental damage.

Piezoelectric materials facilitate direct conversion between electrical energy and elastic energy after being subjected to an electric field. Piezoelectric materials can also be referred as transducer as they convert one form of energy into another. Global market of piezoelectric devices can be segmented into different types that include actuators, Langevin actuator, resonators, piezoelectric generators, piezoelectric sensors, accelerators, acoustic devices, ultrasonic motors and piezoelectric transformers. Piezoelectric materials traditionally contained Lead which started receiving criticism for its negative environmental impact. Governments are focused to replace these lead based materials with safer alternative.

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Barium Titanate exhibits high permittivity

Barium titanate is one of the first materials used for creating lead-free piezoelectric ceramics. It is widely used for its high permittivity which makes it great materials for capacitors. Studies are conducted on perovskite group of lead-free piezoelectric that contain bi-based materials. Potassium Bismuth Titanate is another potential material used in lead free materials to produce piezoelectricity. The major challenge posed by Potassium Bismuth Titanate is that dense ceramics cannot be made with general firing methods. Its high conductivity results in ineffective poling. Its compositions such as BNT-BaTiO3 binary systems display improved pyroelectric and piezoelectric properties.

Recent researches on Sodium Potassium Niobate disclose that it can be used to create high piezoelectric properties in ceramics after crystallographic texturing which is performed using different dopants. Piezo response force microscopy (PFM) is used to analyze relationship between high piezoelectricity and its microstructure. It is used to highlight other aspects that include ferroelectric domain structure, domain wall conduction and local polarization.

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