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

• Autorzy: Priyadarshini Sahoo , Anuradha Panigrahi , Sunanda Patri , Ram Choudhary
• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

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

• Czasopismo: Open Physics
• Rocznik: 2008
• Tom: 6
• Numer: 4
• Strony: 843-848

Daty

wydano

2008-12-01

online

2008-09-27

Twórcy

autor

Priyadarshini Sahoo

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

autor

Anuradha Panigrahi

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

autor

Sunanda Patri

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

autor

Ram Choudhary

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

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Identyfikatory

DOI

10.2478/s11534-008-0112-3