Peculiar Properties of Phase Transitions in Na0.5Bi0.5TiO3-xBaTiO3 (0<x<6) Lead-free Relaxor Ferroelectrics Seen Via Acoustic Emission

Na[Formula: see text]Bi[Formula: see text]TiO3-0.06BaTiO3 relaxor ferroelectrics (RFEs) ceramic samples were investigated by means of dielectric and acoustic emission methods in the temperature range of 70–350[Formula: see text]C and in dependence on frequency. Dielectric curve exhibits two anomalies: strongly dispersive the local maximum, within 130–180[Formula: see text]C and slightly dispersive the smeared high-temperature maximum within 300–310[Formula: see text]C. Acoustic emission exhibits the five groups of bursts: near 123[Formula: see text]C, 150–180[Formula: see text]C, near 225[Formula: see text]C, 300–310[Formula: see text]C and 327[Formula: see text]C. The first and third groups of acoustic emission bursts correspond to phase transitions of R[Formula: see text]c-P[Formula: see text]bm phases coexisting in this temperature, range, while the fourth and fifth groups of acoustic emission bursts correspond to P[Formula: see text]bm-P[Formula: see text] /mbm-Pm[Formula: see text] m phase transitions. The second group of acoustic emission bursts corresponds to strongly dispersive local maximum at which no phase transition has been proved in Na[Formula: see text]Bi[Formula: see text]TiO3-0.06BaTiO3. The existence and the location of the intermediate temperature, [Formula: see text], in Na[Formula: see text]Bi[Formula: see text]TiO3-0.06BaTiO3 compound are discussed.

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Non-trivial behavior of the low temperature maximum of dielectric constant and location of the end critical point in Na0.5Bi0.5TiO3-0.06BaTiO3 lead free relaxor ferroelectrics crystals detected by acoustic emission

Journal of Applied Physics ◽

10.1063/1.5009326 ◽

2018 ◽

Vol 123 (4) ◽

pp. 044103 ◽

Cited By ~ 1

Author(s):

Evgeniy Dul'kin ◽

Jenia Tiagunova ◽

Evgeny Mojaev ◽

Michael Roth

Keyword(s):

Dielectric Constant ◽

Acoustic Emission ◽

Low Temperature ◽

Critical Point ◽

Relaxor Ferroelectrics ◽

Lead Free

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Detecting the Burns temperature in Na 0.5 Bi 0.5 TiO 3 -xBaTiO 3 lead-free relaxor ferroelectrics by means of acoustic emission

EPL (Europhysics Letters) ◽

10.1209/0295-5075/124/57001 ◽

2018 ◽

Vol 124 (5) ◽

pp. 57001 ◽

Cited By ~ 2

Author(s):

Evgeniy Dul'kin ◽

Evgeny Mojaev ◽

Michael Roth

Keyword(s):

Acoustic Emission ◽

Relaxor Ferroelectrics ◽

Lead Free

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Acoustic emission and dielectric studies of phase transitions within the morphotropic phase boundary of xPb(Zr1/2Ti1/2)O3-(1−x)Pb(Ni1/3Nb2/3)O3 relaxor ferroelectrics

Applied Physics Letters ◽

10.1063/1.3275730 ◽

2009 ◽

Vol 95 (25) ◽

pp. 252903 ◽

Cited By ~ 6

Author(s):

E. Dul'kin ◽

E. Mojaev ◽

M. Roth ◽

O. Khamman ◽

X. Tan

Keyword(s):

Acoustic Emission ◽

Phase Transitions ◽

Phase Boundary ◽

Morphotropic Phase Boundary ◽

Relaxor Ferroelectrics ◽

Dielectric Studies

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Comparison of random field strengths in (1-x)SrTiO3-xBiFeO3 and (1-x)SrTiO3-xBaTiO3 relaxor ferroelectrics by means of acoustic emission

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200075 ◽

2020 ◽

Vol 92 (2) ◽

pp. 20401

Author(s):

Evgeniy Dul'kin ◽

Michael Roth

Keyword(s):

Acoustic Emission ◽

Random Field ◽

Electric Fields ◽

Bias Field ◽

Relaxor Ferroelectrics ◽

External Bias ◽

Field Strengths

In relaxor (1-x)SrTiO3-xBiFeO3 ferroelectrics ceramics (x = 0.2, 0.3 and 0.4) both intermediate temperatures and Burns temperatures were successfully detected and their behavior were investigated in dependence on an external bias field using an acoustic emission. All these temperatures exhibit a non-trivial behavior, i.e. attain the minima at some threshold fields as a bias field enhances. It is established that the threshold fields decrease as x increases in (1-x)SrTiO3-xBiFeO3, as it previously observed in (1-x)SrTiO3-xBaTiO3 (E. Dul'kin, J. Zhai, M. Roth, Phys. Status Solidi B 252, 2079 (2015)). Based on the data of the threshold fields the mechanisms of arising of random electric fields are discussed and their strengths are compared in both these relaxor ferroelectrics.

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