Enhanced dielectric and ferroelectric responses in La3+/Ti4+ co-substituted SrBi2Ta2O9 Aurivillius phase
Source abstract
Abstract
The molten salt technique was employed to prepare the Aurivillius phases SrBi2Ta2O9 (SBT) and Sr0.9La0.1Bi2Ta1.9Ti0.1O9 (SLBTT). The XRD data and the Le Bail refinement approach demonstrate that both samples formed the double-layer Aurivillius phase with the orthorhombic A21am structure successfully. The SLBTT cell volume is smaller compared to SBT with the substitution of smaller La3+and Ti4+ions and the increased size of the plate- like grains. FTIR analysis indicates the two local arrangements of Ti4+at the B-site to form Ti–O–Ti and Ti–O–Ta bonds. Changes in the structural properties due to La3+and Ti4+substitution are reflected in the electrical properties. The higher ferroelectric transition temperature (Tc) of 455◦C with the diffused phase transition behavior (DPT) was obtained in SLBTT. The unsaturated hysteresis loop of SLBTT obtained the ferroelectric remnant polarization (Pr) of 0.43 μC/cm2 and the coercive field (Ec) of 110.6 kV/cm, respectively. The enhanced ferroelectric characteristic as well as a higher bandgap (Eg) that is driven by the substitution of variable smaller cations.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Multiferroics and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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