Effect of Gadolinium on the structural and dielectric properties of BCZT ceramics

The influence of Gadolinium (Gd) on Ba 0.85 Ca 0.15 Z r0.1 Ti 0.9 O 3 ceramics prepared using high temperature (∼1300°C) solid-state reaction technique is investigated. The X-ray diffraction pattern of the sample confirms the formation of the single-phase compound in a tetragonal crystal structure a...

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Bibliographic Details
Published in:Phase transitions 2020-02, Vol.93 (2), p.245-262
Main Authors: Saparjya, S., Badapanda, T., Behera, S., Behera, B., Das, Piyush R.
Format: Article
Language:English
Subjects:
AC conductivity
Ceramics
Crystal structure
Curie temperature
Curie-Weiss law
DC conductivity
Dielectric properties
Diffraction patterns
Electrical conduction
Electrical properties
Electrical resistivity
ferroelectrics
Gadolinium
High temperature
impedance spectroscopy
Room temperature
SEM
Spectrum analysis
X-ray diffraction
XRD
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Summary:The influence of Gadolinium (Gd) on Ba 0.85 Ca 0.15 Z r0.1 Ti 0.9 O 3 ceramics prepared using high temperature (∼1300°C) solid-state reaction technique is investigated. The X-ray diffraction pattern of the sample confirms the formation of the single-phase compound in a tetragonal crystal structure at room temperature. Micro-structural analyses are recorded using scanning electron microscopy (SEM). Dielectric (i.e. . and tan ) parameters of the compound as a function of temperature at selected frequencies are studied. Modified Curie-Weiss law is implemented to study the diffusivity of the material. For the investigation of the electrical conduction process, impedance spectroscopy and electrical modulus analysis have been utilized. The material shows negative temperature coefficient of resistance (NTCR)-type behavior, indicating its semiconducting characteristics. Studies of electric modulus signify the presence of hopping mechanism in the system. The ac conductivity spectra are found to obey Jonscher's universal power law.
ISSN:0141-1594
1029-0338
DOI:10.1080/01411594.2020.1711905