Structural characteristics of new high-Q (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 < x < 1.0) microwave ceramics

Ji Won Choi; Jong Yoon Ha; Chong Yun Kang; Seok Jin Yoon; Hyun Jai Kim; Ki Hyun Yoon

doi:10.1016/S0254-0584(02)00287-0

Structural characteristics of new high-Q (1-x)(Al_1/2Ta_1/2)O₂-x(Mg_1/3Ta_{2/ 3})O₂ (0.2 < x < 1.0) microwave ceramics

Ji Won Choi, Jong Yoon Ha, Chong Yun Kang, Seok Jin Yoon, Hyun Jai Kim, Ki Hyun Yoon

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

Abstract

The crystal structure and microstructure of microwave dielectric (1-x)(Al_1/2Ta_1/2)O₂-x(Mg_1/3Ta_{2/ 3})O₂ (0.2 ≤ x ≤ 1.0) ceramics have been investigated. It is reported in the JCPDS cards that (Al_1/2Ta_1/2)O₂ and (Mg_1/3Ta_2/3)O₂ have orthorhombic and tetragonal structure, respectively. (1-x)(Al_1/2Ta_1/2)O₂-x(Mg_1/3Ta_{2/ 3})O₂ ceramics had two phases of orthorhombic and tetragonal at low (Mg_1/3Ta_2/3)O₂ concentration but as (Mg_1/3Ta_2/3)O₂ concentration increased, (1-x)(Al_1/2Ta_1/2)O₂-x(Mg_1/3Ta_{2/ 3})O₂ transformed into tetragonal structure. Specimens having tetragonal single phase could be obtained over x = 0.6. As (Mg_1/3Ta_2/3)O₂ concentration increased, the cell parameters, X-ray density, and the grain size increased. However, apparent density increased from 0.2 to 0.65 concentration of (Mg_1/3Ta_2/3)O₂ and then decreased over 0.65 concentration of (Mg_1/3Ta_2/3)O₂. The number and size of pores in grains also decreased from 0.2 to 0.65 concentration of (Mg_1/3Ta_2/3)O₂ and then increased over 0.65 concentration of (Mg_1/3Ta_2/3)O₂. It is expected that the relationship between structural characteristics and microwave dielectric characteristics have a good correlation.

Original language	English
Pages (from-to)	243-246
Number of pages	4
Journal	Materials Chemistry and Physics
Volume	79
Issue number	2-3
DOIs	https://doi.org/10.1016/S0254-0584(02)00287-0
Publication status	Published - 2003 Apr 10

Keywords

(1-x)(AlTa)O-x(MgTa )O
Cell parameters
Grain size
Tetragonal structure
X-ray density

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Access to Document

10.1016/S0254-0584(02)00287-0

Cite this

@article{525631ac4584477c807b8ffa173cc0e9,

title = "Structural characteristics of new high-Q (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 < x < 1.0) microwave ceramics",

abstract = "The crystal structure and microstructure of microwave dielectric (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 ≤ x ≤ 1.0) ceramics have been investigated. It is reported in the JCPDS cards that (Al1/2Ta1/2)O2 and (Mg1/3Ta2/3)O2 have orthorhombic and tetragonal structure, respectively. (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 ceramics had two phases of orthorhombic and tetragonal at low (Mg1/3Ta2/3)O2 concentration but as (Mg1/3Ta2/3)O2 concentration increased, (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 transformed into tetragonal structure. Specimens having tetragonal single phase could be obtained over x = 0.6. As (Mg1/3Ta2/3)O2 concentration increased, the cell parameters, X-ray density, and the grain size increased. However, apparent density increased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then decreased over 0.65 concentration of (Mg1/3Ta2/3)O2. The number and size of pores in grains also decreased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then increased over 0.65 concentration of (Mg1/3Ta2/3)O2. It is expected that the relationship between structural characteristics and microwave dielectric characteristics have a good correlation.",

keywords = "(1-x)(AlTa)O-x(MgTa )O, Cell parameters, Grain size, Tetragonal structure, X-ray density",

author = "Choi, {Ji Won} and Ha, {Jong Yoon} and Kang, {Chong Yun} and Yoon, {Seok Jin} and Kim, {Hyun Jai} and Yoon, {Ki Hyun}",

year = "2003",

month = apr,

day = "10",

doi = "10.1016/S0254-0584(02)00287-0",

language = "English",

volume = "79",

pages = "243--246",

journal = "Materials Chemistry and Physics",

issn = "0254-0584",

publisher = "Elsevier B.V.",

number = "2-3",

}

TY - JOUR

T1 - Structural characteristics of new high-Q (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 < x < 1.0) microwave ceramics

AU - Choi, Ji Won

AU - Ha, Jong Yoon

AU - Kang, Chong Yun

AU - Yoon, Seok Jin

AU - Kim, Hyun Jai

AU - Yoon, Ki Hyun

PY - 2003/4/10

Y1 - 2003/4/10

N2 - The crystal structure and microstructure of microwave dielectric (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 ≤ x ≤ 1.0) ceramics have been investigated. It is reported in the JCPDS cards that (Al1/2Ta1/2)O2 and (Mg1/3Ta2/3)O2 have orthorhombic and tetragonal structure, respectively. (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 ceramics had two phases of orthorhombic and tetragonal at low (Mg1/3Ta2/3)O2 concentration but as (Mg1/3Ta2/3)O2 concentration increased, (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 transformed into tetragonal structure. Specimens having tetragonal single phase could be obtained over x = 0.6. As (Mg1/3Ta2/3)O2 concentration increased, the cell parameters, X-ray density, and the grain size increased. However, apparent density increased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then decreased over 0.65 concentration of (Mg1/3Ta2/3)O2. The number and size of pores in grains also decreased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then increased over 0.65 concentration of (Mg1/3Ta2/3)O2. It is expected that the relationship between structural characteristics and microwave dielectric characteristics have a good correlation.

AB - The crystal structure and microstructure of microwave dielectric (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 ≤ x ≤ 1.0) ceramics have been investigated. It is reported in the JCPDS cards that (Al1/2Ta1/2)O2 and (Mg1/3Ta2/3)O2 have orthorhombic and tetragonal structure, respectively. (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 ceramics had two phases of orthorhombic and tetragonal at low (Mg1/3Ta2/3)O2 concentration but as (Mg1/3Ta2/3)O2 concentration increased, (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 transformed into tetragonal structure. Specimens having tetragonal single phase could be obtained over x = 0.6. As (Mg1/3Ta2/3)O2 concentration increased, the cell parameters, X-ray density, and the grain size increased. However, apparent density increased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then decreased over 0.65 concentration of (Mg1/3Ta2/3)O2. The number and size of pores in grains also decreased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then increased over 0.65 concentration of (Mg1/3Ta2/3)O2. It is expected that the relationship between structural characteristics and microwave dielectric characteristics have a good correlation.

KW - (1-x)(AlTa)O-x(MgTa )O

KW - Cell parameters

KW - Grain size

KW - Tetragonal structure

KW - X-ray density

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U2 - 10.1016/S0254-0584(02)00287-0

DO - 10.1016/S0254-0584(02)00287-0

M3 - Article

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SN - 0254-0584

VL - 79

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EP - 246

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 2-3

ER -