Sintering behavior and microwave dielectric properties of nano alpha-alumina

Cheng Liang Huang; Jun Jie Wang; Chi Yuen Huang

doi:10.1016/j.matlet.2005.06.053

Sintering behavior and microwave dielectric properties of nano alpha-alumina

Cheng Liang Huang, Jun Jie Wang, Chi Yuen Huang

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

94 Citations (Scopus)

Abstract

The microstructures and the microwave dielectric properties of nano alpha alumina (α-Al₂O₃) ceramics have been investigated. It is found that the use of nano particle-sized starting material can significantly improve the densification and their microwave dielectric properties of the specimens. The α-Al₂O₃ ceramics can be sintered at 1450°C and increased beyond 99% of its theoretical density at 1500°C. The specimens demonstrated single α-Al ₂O₃ phase throughout the entire experiments. The dielectric constant (ε_r) and temperature coefficient of resonant frequency (τ_f) were not significantly affected, while the unloaded quality factors Q were effectively promoted at temperatures higher than 1450°C. The ε_r value of 10, Q × f value of 521,000 (at 14 GHz) and τ_f value of - 48.9 ppm/°C were obtained for α-Al₂O₃ ceramics without sintering aid at 1550°C for 4 h.

Original language	English
Pages (from-to)	3746-3749
Number of pages	4
Journal	Materials Letters
Volume	59
Issue number	28
DOIs	https://doi.org/10.1016/j.matlet.2005.06.053
Publication status	Published - 2005 Dec

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matlet.2005.06.053

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@article{523573322393442db997ef397e578c01,

title = "Sintering behavior and microwave dielectric properties of nano alpha-alumina",

abstract = "The microstructures and the microwave dielectric properties of nano alpha alumina (α-Al2O3) ceramics have been investigated. It is found that the use of nano particle-sized starting material can significantly improve the densification and their microwave dielectric properties of the specimens. The α-Al2O3 ceramics can be sintered at 1450°C and increased beyond 99% of its theoretical density at 1500°C. The specimens demonstrated single α-Al 2O3 phase throughout the entire experiments. The dielectric constant (εr) and temperature coefficient of resonant frequency (τf) were not significantly affected, while the unloaded quality factors Q were effectively promoted at temperatures higher than 1450°C. The εr value of 10, Q × f value of 521,000 (at 14 GHz) and τf value of - 48.9 ppm/°C were obtained for α-Al2O3 ceramics without sintering aid at 1550°C for 4 h.",

author = "Huang, {Cheng Liang} and Wang, {Jun Jie} and Huang, {Chi Yuen}",

note = "Funding Information: This work was supported by Ministry of Economic Affairs (92-EC-17-A-08-S1-023) through Particulate Materials Research Center of National Cheng Kung University.",

year = "2005",

month = dec,

doi = "10.1016/j.matlet.2005.06.053",

language = "English",

volume = "59",

pages = "3746--3749",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier",

number = "28",

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T1 - Sintering behavior and microwave dielectric properties of nano alpha-alumina

AU - Huang, Cheng Liang

AU - Wang, Jun Jie

AU - Huang, Chi Yuen

N1 - Funding Information: This work was supported by Ministry of Economic Affairs (92-EC-17-A-08-S1-023) through Particulate Materials Research Center of National Cheng Kung University.

PY - 2005/12

Y1 - 2005/12

N2 - The microstructures and the microwave dielectric properties of nano alpha alumina (α-Al2O3) ceramics have been investigated. It is found that the use of nano particle-sized starting material can significantly improve the densification and their microwave dielectric properties of the specimens. The α-Al2O3 ceramics can be sintered at 1450°C and increased beyond 99% of its theoretical density at 1500°C. The specimens demonstrated single α-Al 2O3 phase throughout the entire experiments. The dielectric constant (εr) and temperature coefficient of resonant frequency (τf) were not significantly affected, while the unloaded quality factors Q were effectively promoted at temperatures higher than 1450°C. The εr value of 10, Q × f value of 521,000 (at 14 GHz) and τf value of - 48.9 ppm/°C were obtained for α-Al2O3 ceramics without sintering aid at 1550°C for 4 h.

AB - The microstructures and the microwave dielectric properties of nano alpha alumina (α-Al2O3) ceramics have been investigated. It is found that the use of nano particle-sized starting material can significantly improve the densification and their microwave dielectric properties of the specimens. The α-Al2O3 ceramics can be sintered at 1450°C and increased beyond 99% of its theoretical density at 1500°C. The specimens demonstrated single α-Al 2O3 phase throughout the entire experiments. The dielectric constant (εr) and temperature coefficient of resonant frequency (τf) were not significantly affected, while the unloaded quality factors Q were effectively promoted at temperatures higher than 1450°C. The εr value of 10, Q × f value of 521,000 (at 14 GHz) and τf value of - 48.9 ppm/°C were obtained for α-Al2O3 ceramics without sintering aid at 1550°C for 4 h.

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DO - 10.1016/j.matlet.2005.06.053

M3 - Article

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SN - 0167-577X

VL - 59

SP - 3746

EP - 3749

JO - Materials Letters

JF - Materials Letters

IS - 28

ER -

Sintering behavior and microwave dielectric properties of nano alpha-alumina

Abstract

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