Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics

Min Han Kim; Chang Soo Woo; Sahn Nahm; Chang Hack Choi; Hwack Joo Lee; Hyun Min Park

doi:10.1016/S0025-5408(01)00793-0

Crystal structure and microwave dielectric properties of (1 - x)NdAlO₃-xCaTiO₃ ceramics

Min Han Kim, Chang Soo Woo, Sahn Nahm, Chang Hack Choi, Hwack Joo Lee, Hyun Min Park

Department of Materials Science and Engineering

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

26 Citations (Scopus)

Abstract

Crystal structure and microwave dielectric properties of (1-x)NdAlO₃-xCaTiO₃ ceramics have been investigated. Crystal structure of the specimens changed with the composition. Rhombohedral structure was found for the specimens with x ≤ 0.1. When 0.3 ≤ x ≤ 0.7, the specimens had the tetragonal structure and it changed to the orthorhombic structure as x exceeded 0.7. Two types of the second phases were observed in (1-x)NdAlO₃-xCaTiO₃ ceramics. For the specimens with x ≤ 0.5, Nd₄Al₂O₉ phase was observed and Al-rich phase was found in the specimens with x ≥ 0.7. The dielectric constant (ε_r) and the temperature coefficient of the resonant frequency (τ_f) increased with the increase of x. The Q × f value of the specimen increased with x and exhibited the maximum value when x = 0.5. The microwave dielectric properties of Q × f = 45,000 GHz, ε_r = 45 and τ_f = -1.5 ppm/°C were obtained for 0.3NdAlO₃-0.7CaTiO₃ ceramics.

Original language	English
Pages (from-to)	605-615
Number of pages	11
Journal	Materials Research Bulletin
Volume	37
Issue number	3
DOIs	https://doi.org/10.1016/S0025-5408(01)00793-0
Publication status	Published - 2002 Mar 1

Keywords

A. Ceramics
A. Electronic materials
C. X-ray diffraction
D. Dielectric properties

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/S0025-5408(01)00793-0

Cite this

@article{4efd31b7c8bc4666b1086d55748a40b2,

title = "Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics",

abstract = "Crystal structure and microwave dielectric properties of (1-x)NdAlO3-xCaTiO3 ceramics have been investigated. Crystal structure of the specimens changed with the composition. Rhombohedral structure was found for the specimens with x ≤ 0.1. When 0.3 ≤ x ≤ 0.7, the specimens had the tetragonal structure and it changed to the orthorhombic structure as x exceeded 0.7. Two types of the second phases were observed in (1-x)NdAlO3-xCaTiO3 ceramics. For the specimens with x ≤ 0.5, Nd4Al2O9 phase was observed and Al-rich phase was found in the specimens with x ≥ 0.7. The dielectric constant (εr) and the temperature coefficient of the resonant frequency (τf) increased with the increase of x. The Q × f value of the specimen increased with x and exhibited the maximum value when x = 0.5. The microwave dielectric properties of Q × f = 45,000 GHz, εr = 45 and τf = -1.5 ppm/°C were obtained for 0.3NdAlO3-0.7CaTiO3 ceramics.",

keywords = "A. Ceramics, A. Electronic materials, C. X-ray diffraction, D. Dielectric properties",

author = "Kim, {Min Han} and Woo, {Chang Soo} and Sahn Nahm and Choi, {Chang Hack} and Lee, {Hwack Joo} and Park, {Hyun Min}",

year = "2002",

month = mar,

day = "1",

doi = "10.1016/S0025-5408(01)00793-0",

language = "English",

volume = "37",

pages = "605--615",

journal = "Materials Research Bulletin",

issn = "0025-5408",

publisher = "Elsevier Limited",

number = "3",

}

TY - JOUR

T1 - Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics

AU - Kim, Min Han

AU - Woo, Chang Soo

AU - Nahm, Sahn

AU - Choi, Chang Hack

AU - Lee, Hwack Joo

AU - Park, Hyun Min

PY - 2002/3/1

Y1 - 2002/3/1

N2 - Crystal structure and microwave dielectric properties of (1-x)NdAlO3-xCaTiO3 ceramics have been investigated. Crystal structure of the specimens changed with the composition. Rhombohedral structure was found for the specimens with x ≤ 0.1. When 0.3 ≤ x ≤ 0.7, the specimens had the tetragonal structure and it changed to the orthorhombic structure as x exceeded 0.7. Two types of the second phases were observed in (1-x)NdAlO3-xCaTiO3 ceramics. For the specimens with x ≤ 0.5, Nd4Al2O9 phase was observed and Al-rich phase was found in the specimens with x ≥ 0.7. The dielectric constant (εr) and the temperature coefficient of the resonant frequency (τf) increased with the increase of x. The Q × f value of the specimen increased with x and exhibited the maximum value when x = 0.5. The microwave dielectric properties of Q × f = 45,000 GHz, εr = 45 and τf = -1.5 ppm/°C were obtained for 0.3NdAlO3-0.7CaTiO3 ceramics.

AB - Crystal structure and microwave dielectric properties of (1-x)NdAlO3-xCaTiO3 ceramics have been investigated. Crystal structure of the specimens changed with the composition. Rhombohedral structure was found for the specimens with x ≤ 0.1. When 0.3 ≤ x ≤ 0.7, the specimens had the tetragonal structure and it changed to the orthorhombic structure as x exceeded 0.7. Two types of the second phases were observed in (1-x)NdAlO3-xCaTiO3 ceramics. For the specimens with x ≤ 0.5, Nd4Al2O9 phase was observed and Al-rich phase was found in the specimens with x ≥ 0.7. The dielectric constant (εr) and the temperature coefficient of the resonant frequency (τf) increased with the increase of x. The Q × f value of the specimen increased with x and exhibited the maximum value when x = 0.5. The microwave dielectric properties of Q × f = 45,000 GHz, εr = 45 and τf = -1.5 ppm/°C were obtained for 0.3NdAlO3-0.7CaTiO3 ceramics.

KW - A. Ceramics

KW - A. Electronic materials

KW - C. X-ray diffraction

KW - D. Dielectric properties

UR - http://www.scopus.com/inward/record.url?scp=0036495618&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036495618&partnerID=8YFLogxK

U2 - 10.1016/S0025-5408(01)00793-0

DO - 10.1016/S0025-5408(01)00793-0

M3 - Article

AN - SCOPUS:0036495618

SN - 0025-5408

VL - 37

SP - 605

EP - 615

JO - Materials Research Bulletin

JF - Materials Research Bulletin

IS - 3

ER -