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A. R. Imamaliyev, I. R. Amiraslanov, F. F. Yahyayev, and A. A. Hadiyeva
Size Effect of Submicron Barium-Titanate Particles on Its Phase Transitions and Dielectric Properties
583–592 (2023)

PACS numbers: 65.80.-g,68.37.Hk,77.22.Ch,77.80.Bh,78.67.Bf,81.07.Wx,82.60.Qr

The structure, dielectric properties, and phase transitions of ferroelectric barium-titanate (BaTiO3) particles with sizes of 100, 200, 300, 400, and 500 nm are investigated by powder-diffractometry techniques, low-dimensional dielectric spectroscopy and differential scanning calorimetry (DSC), respectively. Analysis of the x-rays’ diffraction spectra shows that, at room temperature for particles of all sizes, there are no signals corresponding to the cubic phase that contradicts the widely used core–shell model. As shown, the transition from cubic phase to tetragonal one shifts downward with a decrease in the BaTiO3-particle size. For particles with a size of 100 nm, this shift is anomalously large and is of about 80?C. The cubic–tetragonal phase-transition enthalpy for these particles is higher by an order of magnitude in comparison with particles of other sizes. The peak corresponding to the tetragonal–orthorhombic transition is not found in the DSC thermogram in the case of 200 nm size particles. These particles are also distinguished by a significantly high value of the dielectric constant, which will make it possible to use these particles as the main component of superparaelectric materials in the future. The results are discussed to reconcile them with each other.

Key words: barium titanate, ferroelectric, phase transition, dielectric permittivity.

https://doi.org/10.15407/nnn.21.03.583

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