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Relaxor behavior in Ba(Zn1/3Nb2/3)O3-PbTiO3 new solid solution.

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¹Fujian Institute of Research on the Structure ofMatter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China.

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|February 16, 2008

Summary

Researchers discovered relaxor behavior in a new barium zinc niobate (BZN) and lead titanate (PT) perovskite solid solution. This behavior, characterized by frequency-dependent dielectric permittivity, weakened with increased PT content.

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Area of Science:

Materials Science
Solid State Chemistry
Dielectric Materials

Background:

Relaxor ferroelectrics exhibit unique dielectric properties, including frequency-dependent permittivity.
Perovskite oxides are crucial in electronic applications due to their tunable properties.

Purpose of the Study:

To investigate the formation and properties of a new solid solution between BZN and PT.
To characterize the dielectric behavior and relaxor characteristics of the BZN-PT system.

Main Methods:

Solid-state reaction synthesis of the BZN-PT solid solution.
Dielectric permittivity measurements as a function of temperature and frequency.
Analysis of temperature-dependent dielectric data using Vogel-Fulcher and Lorentz-type models.

Main Results:

A new solid solution between Ba(Zn(1/3)Nb(2/3))O(3) (BZN) and PbTiO(3) (PT) was successfully prepared.
The BZN-PT system exhibits relaxor behavior, evidenced by a strong dispersion in dielectric permittivity around T(m).
Relaxor characteristics, including T(m) and dielectric dispersion, were found to decrease with increasing PT content.

Conclusions:

The BZN-PT solid solution displays characteristic relaxor ferroelectric behavior.
The observed dielectric properties are consistent with relaxor models like Vogel-Fulcher and Lorentz-type functions.
Compositional tuning via PT addition can modulate the relaxor behavior in this perovskite system.