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- Title
Crystal Structure, Magnetic, and Dielectric Properties of (x)CoFe<sub>2</sub>O<sub>4</sub>–(1−x)Ba<sub>0.8</sub>Sr<sub>0.2</sub>TiO<sub>3</sub> Multiferroics.
- Authors
Shukla, Anant; Mallick, Jyotirekha; Kumari, Suman; Manglam, Murli Kumar; Biswas, Piyali; Kar, Manoranjan
- Abstract
The composites (x)CoFe2O4–(1−x)Ba0.8Sr0.2TiO3 are prepared by solid‐state reaction method using microwave double‐step sintering. Ba0.8Sr0.2TiO3 crystallizes to tetragonal crystal symmetry with P4mm space group and CoFe2O4 crystallizes to cubic crystal symmetry with Fd3¯m space group. Electron microscopy techniques are used to understand the microstructure, elemental composition, and morphology of the composites. The dielectric properties are measured in the 1 Hz–1 MHz frequency range and 40–400 °C temperature range. Composite with x = 0.1 (ε′ ≈ 170, tan δ = 0.08 at 1 kHz) and 0.2 (ε′ ≈ 390, tan δ = 0.07 at 1 kHz) has better dielectric properties than the parent Ba0.8Sr0.2TiO3 ferroelectric (ε′ ≈ 125, tan δ = 0.16 at 1 kHz) and CoFe2O4 ferrimagnetic phases (ε′ ≈ 375, tan δ = 0.72 at 1 kHz), respectively. Composite with 10% cobalt ferrite has the highest saturation polarization (2.1 μC cm−2), the highest remanent polarization (0.9 μC cm−2), and coercive field (23.9 kV cm−1) compared to ferroelectric phase followed by x = 0.2 composite (PS = 1.6 μC cm−2, Pr = 0.8 μC cm−2, and EC = 19.2 kV cm−1). Composite with x = 0.2 shows the highest magnetic coercive field of 1.96 kOe. Hence, this article advocates that 20% ferrite in the composites is the optimized composition for multiferroic applications. The present study will help to explore piezoelectric, magnetostrictive, and magnetoelectric properties of (x)CoFe2O4–(1−x)Ba0.8Sr0.2TiO3 for the technological application.
- Subjects
DIELECTRIC properties; CRYSTAL structure; MULTIFERROIC materials; CRYSTAL symmetry; ELECTRON microscope techniques; LEAD-free ceramics; MICROWAVE sintering; LEAD titanate
- Publication
Physica Status Solidi (B), 2023, Vol 260, Issue 10, p1
- ISSN
0370-1972
- Publication type
Article
- DOI
10.1002/pssb.202300215