Volume 130, Number 3, May 2020
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||03 June 2020|
Tuning ferroelectricity by manipulating the global and local structure in a lead-free Sr-doped Ba(Ti1-x Snx)O3ceramics
1 Department of Physics, Indian Institute of Technology (BHU) - Varanasi, 221005, India
2 Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology - Indore, 452013, India
Received: 7 January 2020
Accepted: 28 April 2020
The effect of 5% Sr substitution at the Ba site in Ba(Ti1-x Snx)O3 (BTSnx) system is investigated for x=0.05, 0.075, and 0.12 compositions. The phase transition studies were carried out using dielectric, high-resolution X-ray diffraction, and PE hysteresis loop measurements. Rietveld refinements, along with dielectric studies on strontium-doped BTSnx reveal that the inter-ferroelectric phase boundaries observed in pure BaTiO3 approach the Tc line, with morphotropic phase boundary like behaviour. The PE hysteresis loops show enhanced polarization (≈ 190%) in Sr-doped BTSn5, which is attributed to the inter-ferroelectric phase instability (which facilitates polarization rotation, phase boundary motion, and domain wall motion), enhanced tetragonality (c/a), and increased unit-cell polarization evident from the amplitude of frozen phonon mode GM4− corresponding to the zone center of the cubic Brillouin zone. The ferroelectric polarization observed in the average-cubic-structure state of Sr-doped BTSn12 is attributed to the cooperative polar off-centre displacements of A (Ba2+/Sr2+) and B (Ti4+/Sn4+) site cations along 〈100〉 and 〈111〉 directions, respectively. Further, Sr-doped BTSn12 has high dielectric constant and low loss which makes this material an important composition for various technological applications.
PACS: 61.05.-a – Techniques for structure determination / 61.66.-f – Structure of specific crystalline solids / 77.80.B- – Phase transitions and Curie point
© EPLA, 2020
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