Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

DIELECTRIC AND PIEZOELECTRIC PROPERTIES OF 0.8Na_0.5Bi_0.5TiO₃-0.2BaTiO₃ MODIFIED WITH SODIUM NIOBATE
Šarūnas Svirskas^a, Tomas Kudrevičius^a, Eriks Birks^b, Marija Dunce^b, Andris Sternbergs^b, Chih-Hsien Huang^c, and Jūras Banys^a
^aFaculty of Physics, Vilnius University, Saulėtekio 3, 10257 Vilnius, Lithuania
^bInstitute of Solid State Physics, University of Latvia, Kengaraga 8, 1063 Riga, Latvia
^cDepartment of Electrical Engineering, National Cheng Kung University, No. 1 Ta-Hseuh Road, Tainan, Taiwan 70101
Email: sarunas.svirskas@ff.vu.lt

Received 14 October 2022; accepted 18 October 2022

In this paper, we present the dielectric and piezoelectric properties of tetragonal 0.8Na_0.5Bi_0.5TiO₃-0.2BaTiO₃ modified with NaNbO₃ ((1-x)[0.8Na_0.5Bi_0.5TiO₃-0.2BaTiO₃]-xNaNbO₃). Our experimental study has revealed that the ferroelectric phase in these compositions is suppressed with the increase of sodium niobate concentration. A broad anomaly, resembling relaxor ferroelectrics, appears in the 325–450 K temperature interval. The investigation of the electric field dependence of polarization has indicated that the double hysteresis loop behaviour is characteristic of the modified compositions, which is associated with the 1st order phase transition under the applied electric field. The experiments below room temperature have revealed that the range of stability of the ferroelectric phase is shifted to lower temperatures upon the increase of sodium niobate concentration. The electromechanical displacement in the modified compositions shows a similar maximum displacement in the whole concentration range. The electromechanical response in 0.8Na_0.5B_0.5TiO₃-0.2BaTiO₃ solid solutions is due to the piezoelectric effect, while, in the mixed compositions, it is related to the jump-like change of the lattice constants in the vicinity of electric field-induced 1st order phase transition.
Keywords: dielectric spectroscopy, phase transitions, perovskites

0,8Na_0,5Bi_0,5TiO₃-0,2BaTiO₃, MAIŠYTO SU NATRIO NIOBATU, DIELEKTRINIŲ IR PJEZOELEKTRINIŲ SAVYBIŲ TYRIMAS
Šarūnas Svirskas^a, Tomas Kudrevičius^a, Eriks Birks^b, Marija Dunce^b, Andris Sternbergs^b, Chih-Hsien Huang^c, Jūras Banys^a

^aVilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva
^bLatvijos universiteto Kietojo kūno fizikos institutas, Ryga, Latvija
^cNacionalinio Cheng Kung universiteto Elektros inžinerijos fakultetas, Tainanas, Taivanas

Šiame darbe buvo tiriamos tetragoninio 0,8Na_0,5Bi_0,5TiO₃-0,2BaTiO₃, maišyto su NaNbO₃, dielektrinės ir pjezoelektrinės savybės. Tyrimai atskleidė, kad didinant NaNbO₃ koncentraciją x, feroelektrinė fazė yra slopinama kambario temperatūroje. Maišytose kompozicijose išryškėja plati anomalija 325–450 K temperatūrų intervale. Ši anomalija primena feroelektriniams relaksoriams būdingus bruožus. Detaliau ištyrus poliarizacijos ir poslinkio histerezės kilpas buvo nustatyta, kad maišytose kompozicijose formuojasi dvigubos histerezės kilpos, būdingos elektriniu lauku indukuojamiems 1-os rūšies faziniams virsmams. Buvo nustatyta, kad kuo didesnė natrio niobato koncentracija, tuo žemesnėje temperatūroje stebimos feroelektrinės poliarizacijos kilpos. Elektromechaninės sistemos savybės skirtingose kompozicijose yra panašios, pasiekiami gana dideli pjezoelektriniai poslinkiai. Grynoje medžiagoje elektromechaninis atsakas yra susijęs su pjezoefektu, o maišytose kompozicijose – su dideliu gardelės parametrų pokyčiu, indukuojant 1-os rūšies fazinį virsmą elektriniu lauku.

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