Dielectric, ferromagnetic and ferroelectric properties of the (1 − x)Ba0.8Sr0.2TiO3–xCoFe2O4 multiferroic particulate ceramic composites

Abstract

The (1 -x)Ba 0.8 Sr 0.2 TiO 3 -xCoFe 2 O 4 ceramic composites (x = 0-1) were prepared by standard solid state reaction method. X-ray diffraction and SEM indicate the Ba 0.8 Sr 0.2 TiO 3 (BST) phase and CoFe 2 O 4 (CFO) phase coexist in the composites. The dielectric constant and dielectric loss for the composites were studied as a function of frequency (40 Hz-1 MHz) and temperature (30-600°C). Magnetic and ferroelectric tests show that the ceramic composites display ferromagnetic and ferroelectric properties simultaneously. The saturated polarization of the composites decrease with ferrite concentration increasing, while the remnant polarization of the composites increase with increasing ferrite concentration. The enhanced ferroelectricity of composites may be attributed to space charge contribution in the composites.

High quality transparent conductive SnO2/Ag/SnO2 tri-layer films deposited at room temperature by magnetron sputtering

“…Transparent conducting oxide (TCO) films are extensively used for a variety of applications in microelectronic systems, such as liquid crystal displays, organic light emitting diodes, and solar cells [1][2][3]. As the major applications of transparent conductive oxides (TCO) increase, demand will grow for materials having lower sheet resistances while retaining good optical properties.…”

Novel Method of Synthesis of Multiferroic Nickel Cobalt Ferrite–Barium Strontium Titanate Composite System

“…Composite samples C–1000, C–1100, and C–1150 possess much lower remanent and saturation polarization values than the other two samples pointing toward weakening of ferroelectric properties in these samples. P–E loops of composite samples C–1000, C–1100, and C–1150 are inclined more toward electric field axis in comparison with P–E loops of samples C–1200 and C–1250, indicating their lower resistivity . Coercive electric field of the composite samples follows random trend.…”

“…P-E loops of composite samples C-1000, C-1100, and C-1150 are inclined more toward electric field axis in comparison with P-E loops of samples C-1200 and C-1250, indicating their lower resistivity. [12][13][14] Coercive electric field of the composite samples follows random trend. Composite sample C-1250 possesses highest value of piezoelectric coefficient due to minimum leakage of polarized charges in this sample.…”

Microstructure, Magnetodielectric, and Multiferroic Properties of xCo0.8Cu0.2Fe2O4−y(0.8BaTiO3–0.2BiAlO3) Composite Ceramics

“…The T C peak is recognized, indicating that the dielectric phenomenon-is originated from the 0.8BTO-0.2BA phase. The ε r increases at low frequency and higher temperature, which can be ascribed to the space charge polarization effect [38][39][40] and the hopping conduction mechanism, [41] and the space charge polarization effect has been investigated in the preceding paragraphs. [29,30] The hopping conduction mechanism will be studied in detail.…”