Microwave dielectric properties trends in a solid solution (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd, 0.0≤x≤0.2) system

Di Zhou, Clive A. Randall, Hong Wang, Li Xia Pang, Xi Yao

Research output: Contribution to journalArticle

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Abstract

The influence of La 3+ and Nd 3+ substitution for the Bi 3+ cations in the low-firing Bi 2 Mo 2 O 9 system is considered in regard to the sintering behavior, density, phase composition, and microwave dielectric properties. All the compositions can be sintered to high densities in temperature range of 620°-680°C. In (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd) ceramics, when x≤0.2 the solid solution is within a monoclinic phase (P2 1 /n) and the phase had an increase in melting temperature with the doping. In the La substitution case, the (Bi 0.8 La 0.2 ) 2 Mo 2 O 9 ceramics had the best microwave dielectric properties with a permittivity of 32.7, a Qf value (f=resonant frequency, Q=1/dielectric loss at f) of 13 490 GHz and a temperature coefficient of -4.6 ppm/°C. With the Nd-substituted samples, the (Bi 0.9 Nd 0.1 ) 2 Mo 2 O 9 ceramics had the best microwave dielectric properties with a permittivity of 33.9, a Qf value of 15 200 GHz and a temperature coefficient of +8.05 ppm/°C. The substitution of La and Nd can effectively modify the microwave dielectric properties of Bi 2 Mo 2 O 9 ceramic and in particular adjust the temperature coefficient to near zero. The (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd) ceramics are very interesting new materials for an ultralow-temperature cofired ceramics technology that is compatible with Al metal electrodes.

Original languageEnglish (US)
Pages (from-to)2931-2936
Number of pages6
JournalJournal of the American Ceramic Society
Volume92
Issue number12
DOIs
StatePublished - Dec 1 2009

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Dielectric properties
Solid solutions
Microwaves
Substitution reactions
Permittivity
Temperature
Dielectric losses
Phase composition
Melting point
Cations
Natural frequencies
Sintering
Positive ions
Metals
Doping (additives)
Electrodes
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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title = "Microwave dielectric properties trends in a solid solution (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd, 0.0≤x≤0.2) system",
abstract = "The influence of La 3+ and Nd 3+ substitution for the Bi 3+ cations in the low-firing Bi 2 Mo 2 O 9 system is considered in regard to the sintering behavior, density, phase composition, and microwave dielectric properties. All the compositions can be sintered to high densities in temperature range of 620°-680°C. In (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd) ceramics, when x≤0.2 the solid solution is within a monoclinic phase (P2 1 /n) and the phase had an increase in melting temperature with the doping. In the La substitution case, the (Bi 0.8 La 0.2 ) 2 Mo 2 O 9 ceramics had the best microwave dielectric properties with a permittivity of 32.7, a Qf value (f=resonant frequency, Q=1/dielectric loss at f) of 13 490 GHz and a temperature coefficient of -4.6 ppm/°C. With the Nd-substituted samples, the (Bi 0.9 Nd 0.1 ) 2 Mo 2 O 9 ceramics had the best microwave dielectric properties with a permittivity of 33.9, a Qf value of 15 200 GHz and a temperature coefficient of +8.05 ppm/°C. The substitution of La and Nd can effectively modify the microwave dielectric properties of Bi 2 Mo 2 O 9 ceramic and in particular adjust the temperature coefficient to near zero. The (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd) ceramics are very interesting new materials for an ultralow-temperature cofired ceramics technology that is compatible with Al metal electrodes.",
author = "Di Zhou and Randall, {Clive A.} and Hong Wang and Pang, {Li Xia} and Xi Yao",
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Microwave dielectric properties trends in a solid solution (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd, 0.0≤x≤0.2) system . / Zhou, Di; Randall, Clive A.; Wang, Hong; Pang, Li Xia; Yao, Xi.

In: Journal of the American Ceramic Society, Vol. 92, No. 12, 01.12.2009, p. 2931-2936.

Research output: Contribution to journalArticle

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T1 - Microwave dielectric properties trends in a solid solution (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd, 0.0≤x≤0.2) system

AU - Zhou, Di

AU - Randall, Clive A.

AU - Wang, Hong

AU - Pang, Li Xia

AU - Yao, Xi

PY - 2009/12/1

Y1 - 2009/12/1

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AB - The influence of La 3+ and Nd 3+ substitution for the Bi 3+ cations in the low-firing Bi 2 Mo 2 O 9 system is considered in regard to the sintering behavior, density, phase composition, and microwave dielectric properties. All the compositions can be sintered to high densities in temperature range of 620°-680°C. In (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd) ceramics, when x≤0.2 the solid solution is within a monoclinic phase (P2 1 /n) and the phase had an increase in melting temperature with the doping. In the La substitution case, the (Bi 0.8 La 0.2 ) 2 Mo 2 O 9 ceramics had the best microwave dielectric properties with a permittivity of 32.7, a Qf value (f=resonant frequency, Q=1/dielectric loss at f) of 13 490 GHz and a temperature coefficient of -4.6 ppm/°C. With the Nd-substituted samples, the (Bi 0.9 Nd 0.1 ) 2 Mo 2 O 9 ceramics had the best microwave dielectric properties with a permittivity of 33.9, a Qf value of 15 200 GHz and a temperature coefficient of +8.05 ppm/°C. The substitution of La and Nd can effectively modify the microwave dielectric properties of Bi 2 Mo 2 O 9 ceramic and in particular adjust the temperature coefficient to near zero. The (Bi 1-x Ln x ) 2 Mo 2 O 9 (Ln=La, Nd) ceramics are very interesting new materials for an ultralow-temperature cofired ceramics technology that is compatible with Al metal electrodes.

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