Influence of Grain Size on Dielectric Behavior in Lead-Free 0.5 Ba(Zr0.2Ti0.8)O3–0.5 (Ba0.7Ca0.3)TiO3 Ceramics

Fine-tuning of grain sizes can significantly influence the interaction between different dielectric phenomena, allowing the development of materials with tailored dielectric resistivity. By virtue of various synthesis mechanisms, a pathway to manipulate grain sizes and, consequently, tune the materi...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2023-11, Vol.13 (22), p.2934
Main Authors: Ene, Vladimir Lucian, Lupu, Valentin Razvan, Condor, Claudiu Vasile, Patru, Roxana Elena, Hrib, Luminita Mirela, Amarande, Luminita, Nicoara, Adrian Ionut, Pintilie, Lucian, Ianculescu, Adelina-Carmen
Format: Article
Language:English
Subjects:
Aqueous solutions
Barium
BCT-BZT ceramics
Ceramics
Chemical synthesis
Consolidation
conventional sintering
Crystallization
Curie temperature
Dielectric loss
Dielectric properties
Electrical properties
Fabrication
Grain size
Granulation
Lead free
Particle size
Perovskites
Phase transitions
Plasma sintering
Polyvinyl alcohol
Reagents
sol-gel
Sol-gel processes
Solid solutions
Solid state
Spark plasma sintering
Titanium
Zirconium
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Summary:Fine-tuning of grain sizes can significantly influence the interaction between different dielectric phenomena, allowing the development of materials with tailored dielectric resistivity. By virtue of various synthesis mechanisms, a pathway to manipulate grain sizes and, consequently, tune the material’s dielectric response is revealed. Understanding these intricate relationships between granulation and dielectric properties can pave the way for designing and optimizing materials for specific applications where tailored dielectric responses are sought. The experimental part involved the fabrication of dense BCT-BZT ceramics with different grain sizes by varying the synthesis (conventional solid-state reaction route and sol-gel) and consolidation methods. Both consolidation methods produced well-crystallized specimens, with Ba0.85Ca0.15O3Ti0.9Zr0.1 (BCTZ) perovskite as the major phase. Conventional sintering resulted in microstructured and submicron-structured BCT-BZT ceramics, with average grain sizes of 2.35 μm for the solid-state sample and 0.91 μm for the sol-gel synthesized ceramic. However, spark plasma sintering produced a nanocrystalline specimen with an average grain size of 67.5 nm. As the grain size decreases, there is a noticeable decrease in the maximum permittivity, a significant reduction in dielectric losses, and a shifting of the Curie temperature towards lower values.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano13222934