Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates

Yeon Hwa Jo; Sae Han Na Doo; Joon Seok Lee; Bhaskar C. Mohanty; Yong Soo Cho

doi:10.1016/j.jallcom.2010.09.110

Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates

Yeon Hwa Jo, Sae Han Na Doo, Joon Seok Lee, Bhaskar C. Mohanty, Yong Soo Cho

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Low loss dielectrics based on two borate glasses, (13-19)CaO·(13-19) La₂O₃·68B₂O₃ and (13-19)ZnO·(13-19)La₂O₃·68B ₂O₃, have been investigated with a focus on effects of the CaO/La₂O₃ and ZnO/La₂O₃ ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al₂O₃ filler and by firing at 850 °C for 30 min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO· 19La₂O₃·B₂O₃ sample having the lowest Ca content showed the highest Q × f of ∼8100, while the 19ZnO·13La₂O₃·B₂O₃ sample having the highest Zn content showed the highest Q × f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO ₃ and LaAl_2.03(B₄O₁₀)O _0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance.

Original language	English
Pages (from-to)	849-853
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	509
Issue number	3
DOIs	https://doi.org/10.1016/j.jallcom.2010.09.110
Publication status	Published - 2011 Jan 21

Bibliographical note

Funding Information:
This work was supported by Korea Energy Management Corporation (KEMCO) of the Ministry of Knowledge Economy and partially, by the Defense Nano-Technology Application Center .

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2010.09.110

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title = "Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates",

abstract = "Low loss dielectrics based on two borate glasses, (13-19)CaO·(13-19) La2O3·68B2O3 and (13-19)ZnO·(13-19)La2O3·68B 2O3, have been investigated with a focus on effects of the CaO/La2O3 and ZnO/La2O3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al2O3 filler and by firing at 850 °C for 30 min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO· 19La2O3·B2O3 sample having the lowest Ca content showed the highest Q × f of ∼8100, while the 19ZnO·13La2O3·B2O3 sample having the highest Zn content showed the highest Q × f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO 3 and LaAl2.03(B4O10)O 0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance.",

author = "Jo, {Yeon Hwa} and Doo, {Sae Han Na} and Lee, {Joon Seok} and Mohanty, {Bhaskar C.} and Cho, {Yong Soo}",

note = "Funding Information: This work was supported by Korea Energy Management Corporation (KEMCO) of the Ministry of Knowledge Economy and partially, by the Defense Nano-Technology Application Center .",

year = "2011",

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AU - Jo, Yeon Hwa

AU - Doo, Sae Han Na

AU - Lee, Joon Seok

AU - Mohanty, Bhaskar C.

AU - Cho, Yong Soo

N1 - Funding Information: This work was supported by Korea Energy Management Corporation (KEMCO) of the Ministry of Knowledge Economy and partially, by the Defense Nano-Technology Application Center .

PY - 2011/1/21

Y1 - 2011/1/21

N2 - Low loss dielectrics based on two borate glasses, (13-19)CaO·(13-19) La2O3·68B2O3 and (13-19)ZnO·(13-19)La2O3·68B 2O3, have been investigated with a focus on effects of the CaO/La2O3 and ZnO/La2O3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al2O3 filler and by firing at 850 °C for 30 min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO· 19La2O3·B2O3 sample having the lowest Ca content showed the highest Q × f of ∼8100, while the 19ZnO·13La2O3·B2O3 sample having the highest Zn content showed the highest Q × f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO 3 and LaAl2.03(B4O10)O 0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance.

AB - Low loss dielectrics based on two borate glasses, (13-19)CaO·(13-19) La2O3·68B2O3 and (13-19)ZnO·(13-19)La2O3·68B 2O3, have been investigated with a focus on effects of the CaO/La2O3 and ZnO/La2O3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al2O3 filler and by firing at 850 °C for 30 min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO· 19La2O3·B2O3 sample having the lowest Ca content showed the highest Q × f of ∼8100, while the 19ZnO·13La2O3·B2O3 sample having the highest Zn content showed the highest Q × f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO 3 and LaAl2.03(B4O10)O 0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance.

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Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates

Abstract

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