A new low-loss microwave dielectric using (Ca0.8Sr 0.2)TiO3-doped MgTiO3 ceramics

Jhih Yong Chen, Cheng-Liang Huang

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The microwave dielectric properties and the microstructures of the (1-x)MgTiO3-x(Ca0.8Sr0.2)TiO3 ceramic system prepared by the conventional solid-state route were investigated. (Ca0.8Sr0.2)TiO3 was employed as a τf compensator and was added to MgTiO3 to achieve a temperature-stable material. Ilmenite-structured MgTiO3 and perovskite-structured (Ca0.8Sr0.2)TiO3 were coexisted and the two-phase system was confirmed by the X-ray diffraction patterns and the energy-dispersive X-ray analysis. Although the εr of the specimen could be boosted by increasing amount of (Ca0.8Sr0.2)TiO3, it would instead render a decrease in the Q × f. The τf value is strongly correlated to the compositions and can be controlled through the existing phases. In fact, τf could be adjusted to a near-zero value by mixing 94 mole% MgTiO3 and 6 mole% (Ca0.8Sr0.2)TiO3. A dielectric constant (εr) of 21.42, a high Q × f value of 83,700 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of - 1.8 ppm/°C were obtained for 0.94MgTiO 3-0.06(Ca0.8Sr0.2)TiO3 sintered at 1300 °C for 4 h. It is proposed as a low-loss and low-cost dielectric material for microwave and millimeter wave applications.

Original languageEnglish
Pages (from-to)2585-2588
Number of pages4
JournalMaterials Letters
Volume64
Issue number23
DOIs
Publication statusPublished - 2010 Dec 15

Fingerprint

Microwaves
ceramics
Ilmenite
microwaves
binary systems (materials)
ilmenite
Energy dispersive X ray analysis
compensators
Millimeter waves
Dielectric properties
Perovskite
millimeter waves
Diffraction patterns
resonant frequencies
dielectric properties
Q factors
Natural frequencies
x rays
Permittivity
diffraction patterns

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "A new low-loss microwave dielectric using (Ca0.8Sr 0.2)TiO3-doped MgTiO3 ceramics",
abstract = "The microwave dielectric properties and the microstructures of the (1-x)MgTiO3-x(Ca0.8Sr0.2)TiO3 ceramic system prepared by the conventional solid-state route were investigated. (Ca0.8Sr0.2)TiO3 was employed as a τf compensator and was added to MgTiO3 to achieve a temperature-stable material. Ilmenite-structured MgTiO3 and perovskite-structured (Ca0.8Sr0.2)TiO3 were coexisted and the two-phase system was confirmed by the X-ray diffraction patterns and the energy-dispersive X-ray analysis. Although the εr of the specimen could be boosted by increasing amount of (Ca0.8Sr0.2)TiO3, it would instead render a decrease in the Q × f. The τf value is strongly correlated to the compositions and can be controlled through the existing phases. In fact, τf could be adjusted to a near-zero value by mixing 94 mole{\%} MgTiO3 and 6 mole{\%} (Ca0.8Sr0.2)TiO3. A dielectric constant (εr) of 21.42, a high Q × f value of 83,700 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of - 1.8 ppm/°C were obtained for 0.94MgTiO 3-0.06(Ca0.8Sr0.2)TiO3 sintered at 1300 °C for 4 h. It is proposed as a low-loss and low-cost dielectric material for microwave and millimeter wave applications.",
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A new low-loss microwave dielectric using (Ca0.8Sr 0.2)TiO3-doped MgTiO3 ceramics. / Chen, Jhih Yong; Huang, Cheng-Liang.

In: Materials Letters, Vol. 64, No. 23, 15.12.2010, p. 2585-2588.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Chen, Jhih Yong

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N2 - The microwave dielectric properties and the microstructures of the (1-x)MgTiO3-x(Ca0.8Sr0.2)TiO3 ceramic system prepared by the conventional solid-state route were investigated. (Ca0.8Sr0.2)TiO3 was employed as a τf compensator and was added to MgTiO3 to achieve a temperature-stable material. Ilmenite-structured MgTiO3 and perovskite-structured (Ca0.8Sr0.2)TiO3 were coexisted and the two-phase system was confirmed by the X-ray diffraction patterns and the energy-dispersive X-ray analysis. Although the εr of the specimen could be boosted by increasing amount of (Ca0.8Sr0.2)TiO3, it would instead render a decrease in the Q × f. The τf value is strongly correlated to the compositions and can be controlled through the existing phases. In fact, τf could be adjusted to a near-zero value by mixing 94 mole% MgTiO3 and 6 mole% (Ca0.8Sr0.2)TiO3. A dielectric constant (εr) of 21.42, a high Q × f value of 83,700 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of - 1.8 ppm/°C were obtained for 0.94MgTiO 3-0.06(Ca0.8Sr0.2)TiO3 sintered at 1300 °C for 4 h. It is proposed as a low-loss and low-cost dielectric material for microwave and millimeter wave applications.

AB - The microwave dielectric properties and the microstructures of the (1-x)MgTiO3-x(Ca0.8Sr0.2)TiO3 ceramic system prepared by the conventional solid-state route were investigated. (Ca0.8Sr0.2)TiO3 was employed as a τf compensator and was added to MgTiO3 to achieve a temperature-stable material. Ilmenite-structured MgTiO3 and perovskite-structured (Ca0.8Sr0.2)TiO3 were coexisted and the two-phase system was confirmed by the X-ray diffraction patterns and the energy-dispersive X-ray analysis. Although the εr of the specimen could be boosted by increasing amount of (Ca0.8Sr0.2)TiO3, it would instead render a decrease in the Q × f. The τf value is strongly correlated to the compositions and can be controlled through the existing phases. In fact, τf could be adjusted to a near-zero value by mixing 94 mole% MgTiO3 and 6 mole% (Ca0.8Sr0.2)TiO3. A dielectric constant (εr) of 21.42, a high Q × f value of 83,700 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of - 1.8 ppm/°C were obtained for 0.94MgTiO 3-0.06(Ca0.8Sr0.2)TiO3 sintered at 1300 °C for 4 h. It is proposed as a low-loss and low-cost dielectric material for microwave and millimeter wave applications.

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