HIGH-TEMPERATURE PIEZOELECTRIC PRESSURE SENSOR WITH IMPROVED SENSITIVITY
BASED ON LEAD-FREE POWER-CERAMICS 

Kikot Viktor Viktorovich, candidate of technical sciences, head of piezo production center, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), E-mail: distorsion@rambler.ru
Cheburachin Igor Nikolaevich, chief technolog, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), E-mail: distorsion@rambler.ru
Koshkin Gleb Aleksandrovich, processing engineer, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), E-mail: distorsion@rambler.ru
Volkov Vadim Sergeevich, candidate of technical sciences, associate professor, senior scientist, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), E-mail: distorsion@rambler.ru
Andreev Valery Georgievich, doctor of technical sciences, professor, E-mail: distorsion@rambler.ru 

621.3.032, 666.638 

10.21685/2307-5538-2019-2-7 

Background. The object of the research is determining of influence of dopants on piezoelectric coefficient and electrical resistivity of high-temperature titanate-niobate bismuth lead-free ceramics for piezoelectric pressure sensors.
Materials and methods. The prototypes of piezoelectric elements doped with chromium, gadolinium and molybdenum are made. The kind of dependence for electro physical parameters of titanate-niobate bismuth ceramic of dopant content is established.
Results. The assumption about influence ways of dopants on titanate-niobate bismuth ceramic properties are made. It’s shown that chromium implantation allows increasing piezoelectric coefficient and molybdenum implantation leads to material electrical resistivity increasing and allows compensating electrical resistivity degradation caused by implantation of chromium.
Conclusions. The implantation of chromium and molybdenum allows to double transformation coefficient of piezoelectric sensor by increasing piezoelectric coefficient d33 while saving work temperature up to 700 °C. 

piezoelectric pressure sensor, sensing element, piezoelectric element, leadless piezoceramic, piezoelectric coefficient, electrical resistivity, titanate-niobate bismuth