Structure and Microwave Dielectric Properties of (Zn1-xCo x)TiO3 Ceramics

Hyo Tae Kim, Michael T. Lanagan

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Dielectric ceramics in the system (Zn1-xCox)TiO 3 (x = 0-1) were synthesized by the solid-state reaction route. The phase distribution, microstructure, and dielectric properties were characterized by using powder X-ray diffraction analysis, electron microscopy, and microwave measurement techniques. Three phase composition regions were identified in the specimens sintered at 1150°C; [spinel + rutile] at 0 ≤ x ≤ 0.5, [spinel + ilmenite + rutile] at 0.5 < x ≤0.7, and [ilmenite] phase at 0.7 < x ≤ 1. For the 0 ≤ x ≤ 0.5 region, the amount of Ti-rich precipitates incorporated into the spinel phase decreased with the Co content at 0 ≤ x ≤ 0.5, with a concomitant increase of the rutile phase. The ilmenite phase appeared for high Co content. The microwave dielectric properties depended on the phase composition and volume according to the three phase regions, where the relative amount of rutile to the spinel or ilmenite determined the dielectric properties. The dielectric constant as a function of Co addition was modeled with a Maxwell mixing rule. An optimum phase distribution was determined in this system with dielectric constant of 25, a Q*f 70 000 GHz, and a low temperature coefficient of the resonant frequency.

Original languageEnglish (US)
Pages (from-to)1874-1878
Number of pages5
JournalJournal of the American Ceramic Society
Volume86
Issue number11
DOIs
StatePublished - Jan 1 2003

Fingerprint

Ilmenite
Dielectric properties
Microwaves
Phase composition
Permittivity
Microwave measurement
Solid state reactions
X ray diffraction analysis
Electron microscopy
Precipitates
Natural frequencies
Powders
Microstructure
spinell
titanium dioxide
ilmenite
Temperature

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

@article{a329324bbca5490ba3380d84b1f14584,
title = "Structure and Microwave Dielectric Properties of (Zn1-xCo x)TiO3 Ceramics",
abstract = "Dielectric ceramics in the system (Zn1-xCox)TiO 3 (x = 0-1) were synthesized by the solid-state reaction route. The phase distribution, microstructure, and dielectric properties were characterized by using powder X-ray diffraction analysis, electron microscopy, and microwave measurement techniques. Three phase composition regions were identified in the specimens sintered at 1150°C; [spinel + rutile] at 0 ≤ x ≤ 0.5, [spinel + ilmenite + rutile] at 0.5 < x ≤0.7, and [ilmenite] phase at 0.7 < x ≤ 1. For the 0 ≤ x ≤ 0.5 region, the amount of Ti-rich precipitates incorporated into the spinel phase decreased with the Co content at 0 ≤ x ≤ 0.5, with a concomitant increase of the rutile phase. The ilmenite phase appeared for high Co content. The microwave dielectric properties depended on the phase composition and volume according to the three phase regions, where the relative amount of rutile to the spinel or ilmenite determined the dielectric properties. The dielectric constant as a function of Co addition was modeled with a Maxwell mixing rule. An optimum phase distribution was determined in this system with dielectric constant of 25, a Q*f 70 000 GHz, and a low temperature coefficient of the resonant frequency.",
author = "Kim, {Hyo Tae} and Lanagan, {Michael T.}",
year = "2003",
month = "1",
day = "1",
doi = "10.1111/j.1151-2916.2003.tb03575.x",
language = "English (US)",
volume = "86",
pages = "1874--1878",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "11",

}

Structure and Microwave Dielectric Properties of (Zn1-xCo x)TiO3 Ceramics. / Kim, Hyo Tae; Lanagan, Michael T.

In: Journal of the American Ceramic Society, Vol. 86, No. 11, 01.01.2003, p. 1874-1878.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Structure and Microwave Dielectric Properties of (Zn1-xCo x)TiO3 Ceramics

AU - Kim, Hyo Tae

AU - Lanagan, Michael T.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - Dielectric ceramics in the system (Zn1-xCox)TiO 3 (x = 0-1) were synthesized by the solid-state reaction route. The phase distribution, microstructure, and dielectric properties were characterized by using powder X-ray diffraction analysis, electron microscopy, and microwave measurement techniques. Three phase composition regions were identified in the specimens sintered at 1150°C; [spinel + rutile] at 0 ≤ x ≤ 0.5, [spinel + ilmenite + rutile] at 0.5 < x ≤0.7, and [ilmenite] phase at 0.7 < x ≤ 1. For the 0 ≤ x ≤ 0.5 region, the amount of Ti-rich precipitates incorporated into the spinel phase decreased with the Co content at 0 ≤ x ≤ 0.5, with a concomitant increase of the rutile phase. The ilmenite phase appeared for high Co content. The microwave dielectric properties depended on the phase composition and volume according to the three phase regions, where the relative amount of rutile to the spinel or ilmenite determined the dielectric properties. The dielectric constant as a function of Co addition was modeled with a Maxwell mixing rule. An optimum phase distribution was determined in this system with dielectric constant of 25, a Q*f 70 000 GHz, and a low temperature coefficient of the resonant frequency.

AB - Dielectric ceramics in the system (Zn1-xCox)TiO 3 (x = 0-1) were synthesized by the solid-state reaction route. The phase distribution, microstructure, and dielectric properties were characterized by using powder X-ray diffraction analysis, electron microscopy, and microwave measurement techniques. Three phase composition regions were identified in the specimens sintered at 1150°C; [spinel + rutile] at 0 ≤ x ≤ 0.5, [spinel + ilmenite + rutile] at 0.5 < x ≤0.7, and [ilmenite] phase at 0.7 < x ≤ 1. For the 0 ≤ x ≤ 0.5 region, the amount of Ti-rich precipitates incorporated into the spinel phase decreased with the Co content at 0 ≤ x ≤ 0.5, with a concomitant increase of the rutile phase. The ilmenite phase appeared for high Co content. The microwave dielectric properties depended on the phase composition and volume according to the three phase regions, where the relative amount of rutile to the spinel or ilmenite determined the dielectric properties. The dielectric constant as a function of Co addition was modeled with a Maxwell mixing rule. An optimum phase distribution was determined in this system with dielectric constant of 25, a Q*f 70 000 GHz, and a low temperature coefficient of the resonant frequency.

UR - http://www.scopus.com/inward/record.url?scp=0344443652&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0344443652&partnerID=8YFLogxK

U2 - 10.1111/j.1151-2916.2003.tb03575.x

DO - 10.1111/j.1151-2916.2003.tb03575.x

M3 - Article

VL - 86

SP - 1874

EP - 1878

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 11

ER -