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Dielectric, structural and Raman studies on (Na(0.5)Bi(0.5)TiO(3))((1 - x))(BiCrO(3))(x) ceramic.

Rachna Selvamani¹, Gurvinderjit Singh, Vasant Sathe

¹Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 17, 2011

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This study investigated bismuth chromate-modified bismuth titanate (BiCrO3-modified NBT) perovskite solid solutions. Increasing BiCrO3 content altered phase transitions and dielectric properties, linked to oxygen defect dynamics.

Area of Science:

Solid-state chemistry
Materials science
Dielectric materials

Background:

Perovskite materials exhibit unique dielectric and structural properties.
Bismuth titanate (NBT) is a well-studied lead-free perovskite.
Doping NBT with other oxides can tune its properties.

Purpose of the Study:

To investigate the dielectric, structural, and Raman properties of (NBT)((1 - x))(BiCrO3)(x) solid solutions.
To understand the influence of BiCrO3 doping on NBT's phase transitions and dielectric behavior.
To correlate observed property changes with structural modifications and defect dynamics.

Main Methods:

Synthesis of (NBT)((1 - x))(BiCrO3)(x) solid solutions for x = 0.00, 0.05, 0.10, 0.15.
X-ray diffraction for structural analysis.

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Temperature and frequency-dependent dielectric measurements.

Raman spectroscopy for vibrational analysis.

Main Results:

Rhombohedral R3c crystal structure was confirmed for all compositions.
The anti-phase tilt angle decreased with increasing BiCrO3 content.
Phase transition temperatures (Td, TR-T) decreased, while Tm increased with BiCrO3 doping.
Anomalous dielectric permittivity changes were observed, attributed to oxygen defect dynamics.
Defect-related bands were identified in Raman spectra.

Conclusions:

BiCrO3 doping significantly modifies the structural and dielectric properties of NBT.
Oxygen defect dynamics play a crucial role in the observed dielectric anomalies.
The study provides insights into tuning perovskite properties through aliovalent doping.