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 language | English (US) |
|---|---|
| Pages (from-to) | 2931-2936 |
| Number of pages | 6 |
| Journal | Journal of the American Ceramic Society |
| Volume | 92 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 1 2009 |
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All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry
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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 journal › Article
TY - JOUR
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
N2 - 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.
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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U2 - 10.1111/j.1551-2916.2009.03307.x
DO - 10.1111/j.1551-2916.2009.03307.x
M3 - Article
VL - 92
SP - 2931
EP - 2936
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 12
ER -