Detection of electromagnetic radiation in ferroelectric ceramics for non-contact sensing applications

• Non-contact electromagnetic radiations (EMR) detection in ferroelectrics.
• EMR was detected when the ceramic was subjected to alternating electric field.
• EMR voltage and extent of polarization in ferroelectric are found to be proportional.
• EMR voltage can be used to measure the extent of polarization.
• Non-contact EMR measurement can be used for developing non-contact sensors.

This paper presents some preliminary investigation of electromagnetic radiation (EMR) emissions from (1-x)(Bi0.5Na0.5TiO3)–x(BaTiO3) (x = 0.04, 0.05, 0.06, 0.07 & 0.08) lead-free piezoelectric ceramics. Compositions near the morphotropic phase boundary 0.94(Bi0.5Na0.5TiO3)–0.06(BaTiO3) (BNT-6BT) are studied. The electromagnetic radiations were detected with the help of non–contacting loop antenna placed around the sample. EMR voltage detection was done simultaneously when the piezoelectric material was subjected to alternating electric field. Digital storage oscilloscope was used to measure the EMR voltage. At highest applied alternating electric field of 5.8 kV/cm EMR Signal of 17.6 V was detected for 0.95(Bi0.5Na0.5TiO3)–0.05(BaTiO3) (BNT-5BT). Higher frequency of the electric field leads to the higher acceleration of the dipoles of the piezoelectric material and thus leads to the higher amplitude of EMR. The EMR Voltage is observed to be proportional to the polarization and this can lead to the development of new technique of measuring extent of polarization. Also the EMR phenomenon can be used to develop sensors for non-contact excessive deformation measurement.

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