Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

• Authors: Priyadarshini Sahoo , Anuradha Panigrahi , Sunanda Patri , Ram Choudhary
• Languages of publication: EN

Abstracts

EN

Polycrystalline samples of Ba4SrRTi3V7O30 (R=Sm and Dy), members of the tungsten-bronze family, were prepared using a high-temperature, solid-state reaction technique and studied their electrical properties (using complex impedance spectroscopy) in a wide range of temperature (31–500°C) and frequency (1 kHz-1 MHz). Preliminary structural (XRD) analyses of these compounds show the formation of single-phase, orthorhombic structures at room temperature. The scanning electron micrographs (SEM) provided information on the quality of the samples and uniform distribution of grains over the entire surface of the samples. Detailed studies of the dielectric properties suggest that they have undergone ferroelectric-paraelectric phase transition well above the room temperatures (i.e., 432 and 355°C for R= Sm and Dy, respectively, at frequency 100 kHz). Measurements of electrical conductivity (ac and dc) as a function of temperature suggest that the compounds have semiconducting properties much above the room temperature, with negative temperature coefficient of resistance (NTCR) behavior. The existence of ferroelectricity in these compounds was confirmed from a polarization study.

Keywords

EN

X-ray diffraction; permittivity; polarization; dielectric loss; impedance

Discipline

• 61.05.cp: X-ray diffraction
• 77.22.Ch: Permittivity (dielectric function)(for low-permittivity dielectric films, see 77.55.Bh; for high-permittivity gate dielectric films, 77.55.D-)
• 77.22.Ej: Polarization and depolarization
• 77.22.Gm: Dielectric loss and relaxation

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2008
• Volume: 6
• Issue: 4
• Pages: 843-848

Dates

published

1 - 12 - 2008

online

27 - 9 - 2008

Contributors

author

Priyadarshini Sahoo

• Department of Physics, Betnoti College Betnoti, Mayurbhanj, Orissa, India

author

Anuradha Panigrahi

• Department of Physics, D.N. College, Itanagar, Arunachal Pradesh, India

author

Sunanda Patri

• Department of Physics & Meteorology, IIT, Kharagpur, 721302, India

author

Ram Choudhary

• Department of Physics & Meteorology, IIT, Kharagpur, 721302, India

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Identifiers

DOI

10.2478/s11534-008-0112-3