Novel microwave dielectric LTCCs based uponV2O5 doped M2+Cu2Nb2O8 compounds (M2+=Zn, Co, Ni, Mg and Ca)

Pullar, Robert C.; Lai, Chang; Azough, Feridoon; Freer, Robert; Alford, Neil McN.

doi:10.1016/j.jeurceramsoc.2005.09.083

Cited by 22 publications

(11 citation statements)

References 2 publications

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“…Several low‐permittivity microwave dielectric ceramics, like Al 2 O 3 ‐based, 4,5 silicates, 2,6,7 R 2 BaMO 5 (R=Y, Sm, Nd, and Yb, M=Cu, Zn, and Ni), 8–11 MCu 2 Nb 2 O 8 (M=Zn, Co, Ni, Mg, and Ca), 12 Re 3 Ga 5 O 12 (Re=Nd, Sm, Eu, Dy, Yb, and Y), 3 etc., have been developed for microwave substrate and antenna application. To exploit new low‐permittivity material systems, spinel‐based materials such as M 2 TiO 4 (M=Mg and Co) 1 and MAl 2 O 4 (M=Zn and Mg) 13–16 have attracted much scientific attention of late.…”

Section: Introductionmentioning

confidence: 99%

Modification of ZnAl₂O₄‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO₂ (M=Co, Mg, and Mn)

Lei

Lü

Zhu

et al. 2008

Journal of the American Ceramic Society

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ZnAl2O4‐based microwave dielectric ceramics with added 2MO–TiO2 (M=Co, Mg, and Mn) were synthesized using the solid‐state reaction. The effects of 2MO–TiO2 additions on the microstructures, phase compositions, and microwave dielectric properties of the 0.79ZnAl2O4–0.21M2TiO4 ceramics has been investigated. It can be observed from X‐ray diffraction results that the single‐phase solid solution in the 0.79ZnAl2O4–0.21Co2TiO4 ceramics, and second‐phase rutile, MgTi2O5, and ZnMn3O7 in the 0.79ZnAl2O4–0.21TiO2, 0.79ZnAl2O4–0.21Mg2TiO4, and 0.79ZnAl2O4–0.21Mn2TiO4 ceramics, respectively, appear. The ɛr and τf values of the 0.79ZnAl2O4–0.21M2TiO4 ceramics are weakly dependent on the M element (Co, Mg, and Mn). The ɛr values of the 0.79ZnAl2O4–0.21M2TiO4 ceramics (about 9.7) are lower than that of the 0.79ZnAl2O4–0.21TiO2 ceramics (ɛr=11.6), whereas the τf values of the former (about −65 ppm/°C) are higher than those of the latter (τf=−0.4 ppm/°C). However, in contrast to the Q×f value of the 0.79ZnAl2O4–0.21TiO2 ceramics (Q×f=74 000 GHz), the magnitude of the 0.79ZnAl2O4–0.21Co2TiO4 ceramics increases to 94 000 GHz and that of the 0.79ZnAl2O4–0.21Mg2TiO4 ceramics improves more than twice, whereas the value of the 0.79ZnAl2O4–0.21Mn2TiO4 ceramics undergoes a sharp decline and reaches a minimum of 23 530 GHz at about 6.5 GHz.

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Section: Introductionmentioning

confidence: 99%

Modification of ZnAl₂O₄‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO₂ (M=Co, Mg, and Mn)

Lei

Lü

Zhu

et al. 2008

Journal of the American Ceramic Society

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“…Optimum MW properties were obtained for K 0.5 (Nd 0.3 Bi 0.2 )MoO 4 ( x = 0.4) ceramics sintered at 620°C with ɛ r ~17.3, Q f ~13 050 GHz and TCF ~+4 ppm/°C and for K 0.5 (Nd 0.35 Bi 0.15 )MoO 4 ( x = 0.3) ceramics sintered at 660°C with ɛ r ~15.4, Q f ~19 650 GHz and TCF ~−15 ppm/°C. A comparison of microwave dielectric ceramics with similar permittivities are listed in Table . Compared with other LTCC microwave dielectric ceramics, the TCF values of the K 0.5 (Nd 1− x Bi x ) 0.5 MoO 4 ceramics can be easily adjusted by changing the content of Bi.…”

Section: Resultsmentioning

confidence: 99%

Temperature stable K_0.5(Nd_1−xBi_x)_0.5MoO₄ microwave dielectrics ceramics with ultra‐low sintering temperature

et al. 2017

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K 0.5 (Nd 1Àx Bi x ) 0.5 MoO 4 (0.2 ≤ x ≤ 0.7) ceramics were prepared via the solid-state reaction method. All ceramics densified below 720°C with a uniform microstructure. As x increased from 0.2 to 0.7, relative permittivity (ɛ r ) increased from 13.6 to 26.2 commensurate with an increase in temperature coefficient of resonant frequency (TCF) from -31 ppm/°C to + 60 ppm/°C and a decrease in Qf value (Q = quality factor; f = resonant frequency) from 23 400 to 8620 GHz. Optimum TCF was obtained for x = 0.3 (À15 ppm/°C) and 0.4 (+4 ppm/°C) sintered at 660 and 620°C with ɛ r~1 5.4, Q f~1 9 650 GHz, and ɛ r~1 7.3, Q f~1 3 050 GHz, respectively. Ceramics in this novel solid solution are a candidate for ultra low temperature co-fired ceramic (ULTCC) technology.

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“…B=Ti, Zr etc.) [4][5][6][7][8], ZnO-Nb2O5-TiO2 [9], A3Nb2O8 (A=Zn, Mg, Ni etc.) [10,11] have been extensively investigated and leaded to well applied and commercialized microwave applications.…”

Section: Introductionmentioning

confidence: 99%

A New Low-loss Niobate-based Microwave Dielectric Ceramic GaNbO4

Yang¹,

Tang²,

Zhang³

2017

dtetr

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In this work, the GaNbO4 microwave dielectric ceramics were studied for the first time. Ceramic samples were obtained via solid-state reaction method and could be sintered well in the temperature range of 1000°C-1080°C. Preparation, phase structure, grain morphology and microwave dielectric properties of GaNbO4 were investigated. It showed a novel microstructure that two allotropic GaNbO4 phases with different average grain sizes were coexisted in the GaNbO4 ceramics. The GaNbO4 sintered at 1060°C exhibited the excellent low-loss microwave dielectric properties of εr = 15.6, Q×f = 98,800 GHz (at 9.2 GHz), τf = -69.4 ppm/°C. *

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Novel microwave dielectric LTCCs based uponV2O5 doped M2+Cu2Nb2O8 compounds (M2+=Zn, Co, Ni, Mg and Ca)

Cited by 22 publications

References 2 publications

Modification of ZnAl₂O₄‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO₂ (M=Co, Mg, and Mn)

Modification of ZnAl₂O₄‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO₂ (M=Co, Mg, and Mn)

Temperature stable K_0.5(Nd_1−xBi_x)_0.5MoO₄ microwave dielectrics ceramics with ultra‐low sintering temperature

A New Low-loss Niobate-based Microwave Dielectric Ceramic GaNbO4

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Novel microwave dielectric LTCCs based uponV2O5 doped M2+Cu2Nb2O8 compounds (M2+=Zn, Co, Ni, Mg and Ca)

Cited by 22 publications

References 2 publications

Modification of ZnAl2O4‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO2 (M=Co, Mg, and Mn)

Modification of ZnAl2O4‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO2 (M=Co, Mg, and Mn)

Temperature stable K0.5(Nd1−xBix)0.5MoO4 microwave dielectrics ceramics with ultra‐low sintering temperature

A New Low-loss Niobate-based Microwave Dielectric Ceramic GaNbO4

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Product

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Modification of ZnAl₂O₄‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO₂ (M=Co, Mg, and Mn)

Modification of ZnAl₂O₄‐Based Low‐Permittivity Microwave Dielectric Ceramics by Adding 2MO–TiO₂ (M=Co, Mg, and Mn)

Temperature stable K_0.5(Nd_1−xBi_x)_0.5MoO₄ microwave dielectrics ceramics with ultra‐low sintering temperature