Microwave dielectric properties of two low temperature sintering ceramics in the PbO–WO3 binary system

Xie, Huidong; Xi, Hailing; Chen, Chao; Zhou, Di

doi:10.1016/j.ceramint.2015.04.033

Cited by 10 publications

(6 citation statements)

References 23 publications

(22 reference statements)

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“…Compositions like K2Mo3O10 [17], 2Na2O-MoO3 composite [18], Li3FeMo3O12 [19], Li8Bi2Mo7O28 [20], Te2Mo0.95W0.5O7 [21], Pb2WO5 [22], Li3BiMo3O12 [20], Li0.5Ce0.5MoO4 [23], (RbBi)0.5MoO4 [24], BaTe4O4+40 wt.% TiTe3O8 [25], (AgBi)0.5(MoW)0.5O4 [26], (AgBi)0.5WO4 [27], and (LiBi)0.5MoO4 [20] have the sintering temperature in the range of 500-600 ̊C , the relative permittivity (r) of 5.6-45, the quality factor (Qf) of 300-36 000 GHz and the temperature coefficient of resonant frequency (f) of -115 to 228 ppm/ ̊C have been reported. However, the ULTCC ceramics with good microwave properties are limited in number so far and from the practical applications point of view, further research is needed.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Joseph

Varghese

Teirikangas

et al. 2018

Composites Part B: Engineering

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The present paper presents ceramic composites with ultralow sintering temperature of 500 ̊C with densification of 96 % by adding small amount (0.5, 1 and 2 wt.%) of Ag2O to CuMoO4 by simple mixing method. The effect of Ag2O addition on the structure, microstructure, sintering and thermal as well as microwave dielectric properties of CuMoO4 is also studied. The reduction in the sintering temperature is due to the formation of trace amount (1.4%) of copper silver molybdate (Cu2Ag2(MoO4)3) as observed from Rietveld refinement analysis as well as backscattered SEM image. Doping has very little influence on the structure and coefficient of thermal expansion that is about 4.7-5.2 ppm/C. The composites sintered at 500 ̊C exhibit relative permittivity of about 8-9, quality factor (Qf) of 26000-37000 GHz at 12 GHz, temperature coefficient of resonant frequency of-31-33 ppm/C and are compatible with Al electrode. The present work results in obtaining welldensified ultralow temperature cofired ceramic composites at low sintering temperature without much structural change and good thermal properties but with different dielectric properties by small doping. These composites can be used as low cost candidates for wide range of microwave applications like multilayer packages and substrates owing to the low energy required during processing and hence can pave way to the advancement of electronic materials.

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Section: Introductionmentioning

confidence: 99%

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Joseph

Varghese

Teirikangas

et al. 2018

Composites Part B: Engineering

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“…Figure 5 summarizes the microwave performance versus sintering temperature for some reported typical low‐temperature sintered ceramics 21–36 . The ceramics investigated in this study demonstrate notable advantages in terms of both sintering temperature and microwave performance.…”

Section: Resultsmentioning

confidence: 97%

Crystal structure and phase formation of MgO–MoO₃‐based ceramics with ultralow dielectric loss: A comprehensive study

Li,

Wang,

et al. 2023

J Am Ceram Soc.

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The MgO‐MoO3 system shows significant potential for applications in microwave dielectric ceramics. However, the formation mechanism, crystal structures, and microwave dielectric properties of this system have not been systematically investigated. This work aims to comprehensively study the crystal structures, phase transitions, and microwave dielectric properties of compounds in the MgO‐MoO3 system. In particular, the research delves into the unexplored transformation mechanism from β‐MgMo2O7 to α‐MgMo2O7 and MgMoO4. As a result, the three compounds exhibiting favorable microwave dielectric properties have been successfully fabricated. These compounds can be effectively sintered at temperatures ranging from 685 to 900°C and exhibited dielectric constants (εr) ranging from 5.41 to 6.89, as well as Qf values ranging from 100 000 to 130 000 GHz. Additionally, prototype microstrip antennas are designed and fabricated using β‐MgMo2O7 and MgMoO4 ceramics as substrates. The obtained antenna's performance is excellent, with S11 values below −30 dB and a gain exceeding 6 dB at 5.8 GHz, highlighting the potential of the developed ceramics for practical applications in microwave devices.

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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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Microwave dielectric properties of two low temperature sintering ceramics in the PbO–WO3 binary system

Cited by 10 publications

References 23 publications

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Crystal structure and phase formation of MgO–MoO₃‐based ceramics with ultralow dielectric loss: A comprehensive study

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

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Microwave dielectric properties of two low temperature sintering ceramics in the PbO–WO3 binary system

Cited by 10 publications

References 23 publications

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Crystal structure and phase formation of MgO–MoO3‐based ceramics with ultralow dielectric loss: A comprehensive study

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

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Crystal structure and phase formation of MgO–MoO₃‐based ceramics with ultralow dielectric loss: A comprehensive study

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