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A study on microstructural and dielectric properties of Ba0.5-xZnxSr0.45Ca0.05TiO3 ceramics

Ying-Chieh Lee|Hui-Ju Hsu|I-Yu Huang|Huei-Jyun Shih|Christian Pithan
청정에너지연구소 (Clean-Energy Research Institute)|2023.12|Journal of Ceramic Processing Research|제24권 제6호|pp. 992-1000|DOI 10.36410/jcpr.2023.24.6.992

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키워드

Microwave dielectric propertiesSecondary phaseBa0.5-xZnxSr0.45Ca0.05TiO3High Entropy Ceramics
주제분류재료공학

초록

reaction process and sintered at temperatures ranging from 1150 °C to 1250 °C. The properties of these ceramics werefound to be significantly affected by variations in the Zn content. Densification of the BZSCT ceramics was observed to occurat sintering temperatures exceeding 1225 °C. Notably, the crystalline phases and dielectric properties of these ceramics werestrongly influenced by the Zn content. Three distinct secondary phases were identified in the BZSCT ceramics, includingBaZn2.03Ti3.93O10.89, Ba2ZnTi5O13 and Zn2TiO4. The addition of Zn resulted in a shift of the Curie point to lower temperatures. Specifically, with Zn substitution (up to 15 at.%), a Curie point of -60 °C was observed in the BZSCT ceramics. Theseceramics exhibited a high dielectric constant of 1035, a low dielectric loss of 0.017%, and an impressive Q value of 442 whensintered at 1225 °C. Moreover, when comparing the dielectric constants of BZSCT ceramics at 1 MHz and 1 GHz, it wasnoted that the permittivity was only slightly reduced by less than 30% at lower frequencies. In contrast, the permittivity ofBST ceramics decreased significantly, by approximately 70%, at microwave frequencies. These findings highlight the uniqueproperties and potential applications of BZSCT ceramics, particularly in microwave applications where they outperformtraditional BST ceramics.

Abstract

reaction process and sintered at temperatures ranging from 1150 °C to 1250 °C. The properties of these ceramics werefound to be significantly affected by variations in the Zn content. Densification of the BZSCT ceramics was observed to occurat sintering temperatures exceeding 1225 °C. Notably, the crystalline phases and dielectric properties of these ceramics werestrongly influenced by the Zn content. Three distinct secondary phases were identified in the BZSCT ceramics, includingBaZn2.03Ti3.93O10.89, Ba2ZnTi5O13 and Zn2TiO4. The addition of Zn resulted in a shift of the Curie point to lower temperatures. Specifically, with Zn substitution (up to 15 at.%), a Curie point of -60 °C was observed in the BZSCT ceramics. Theseceramics exhibited a high dielectric constant of 1035, a low dielectric loss of 0.017%, and an impressive Q value of 442 whensintered at 1225 °C. Moreover, when comparing the dielectric constants of BZSCT ceramics at 1 MHz and 1 GHz, it wasnoted that the permittivity was only slightly reduced by less than 30% at lower frequencies. In contrast, the permittivity ofBST ceramics decreased significantly, by approximately 70%, at microwave frequencies. These findings highlight the uniqueproperties and potential applications of BZSCT ceramics, particularly in microwave applications where they outperformtraditional BST ceramics.

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