Synthesis and characterization of Na5M(MoO4)4 (M = Y, Yb) microwave ceramics for ULTCC applications

Dhanya, Johnson; Suresh, E. K.; Naveenraj, Rajaram; Ratheesh, R.

doi:10.1016/j.ceramint.2018.01.084

Cited by 45 publications

(6 citation statements)

References 35 publications

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“…The list of the crystalline materials characterized by very low sintering temperatures accompanied by good intrinsic dielectric properties (including low dielectric loss) is really short. Besides the quite intensively studied molybdates [3][4][5][6][7][8][9][10][11][12][13][14], some borates [15][16][17][18], and tungstates [19][20][21] are also promising candidates.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Szwagierczak¹,

Synkiewicz-Musialska²,

Kulawik³

et al. 2023

Journal of Advanced Ceramics

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With the development of low dielectric permittivity materials having an ultra-low sintering temperature, testing their dielectric properties at terahertz frequencies suitable for 6G communication systems and implementation of the fabricated materials in ultra-low temperature cofired ceramics (ULTCC) were the main goals of the research. Lithium tungstate Li 2 WO 4 was synthesized by a solid-state reaction and used for the preparation of green tapes and test structures with cofired internal conductive layers, which are destined for substrates of microwave and submillimeter wave circuits. Sintering behavior, thermal effects, and mass changes of the green tapes during heating were studied using a hot-stage microscope, differential thermal analysis, and thermogravimetry. A single-phase composition was revealed for being undoped and doped with AlF 3 -CaB 4 O 7 ceramics. The impact of frequency, temperature, the addition of AlF 3 -CaB 4 O 7 and CuBi 2 O 4 dopants, and sintering temperature was the subject of in-depth characterization of dielectric properties in a terahertz region. A glass-free composition, ultra-low sintering temperature of 590-630 ℃, low roughness of the green tapes, dense microstructure, compatibility with Ag conductors, low and stable dielectric permittivity of 5.0-5.8 in a broad range of 0.2-2 THz, and low dielectric loss of 0.008-0.01 at 1 THz are the main advantages of the developed ULTCC substrates.

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Section: Introductionmentioning

confidence: 99%

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Szwagierczak¹,

Synkiewicz-Musialska²,

Kulawik³

et al. 2023

Journal of Advanced Ceramics

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“…Recent studies point MoO 3 based electroceramic as an excellent option for LTCC application [15][16][17][18][19][20], with high Q x f and low tan δ. Nina Joseph and coworkers obtained CuMoO 4 sintered at low temperature and completely compatible with the Al electrode and with Q x f of 53000 GHz and ε r of 7.9 [21]. Li-xia Pang et al obtained (K 0.5 La 0.5 )MoO 4 with middle ε r , Q x f of 59000 GHz, and 0.0002 of tan δ [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

Araújo¹,

Silva²,

Pereira³

et al. 2020

Preprint

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Molybdates from A2Mo3O12 family have been widely investigated due to its low sintering temperature, low thermal expansion coefficient, and low dielectric loss. Fe2Mo3O12 (FMO) is an oxide from this family and widely used in the catalytic field. The aim of this work is to evaluate the influence of the Bi2O3-B2O3 as a sintering aid in the microstructure and dielectric properties of FMO. The diffraction results showed that the FMO with the monoclinic structure phase was obtained after the calcination process (650 °C). Mössbauer spectroscopy showed the formation of Fe2O3 after the sintering process at 800 °C. The scanning electron-microscopic demonstrates an increase of the grain as a function of sintering aid concentration. The samples were analyzed by using the impedance spectroscopy at radiofrequency with temperature variation. The Nyquist diagram obtained in this temperature range was fitted from an equivalent circuit with three R-CPE associations, corresponding to the morphology of the electroceramics. For dielectric properties in the microwave, all the samples showed values of εr lower than 10. Values of Q x f above 14132.35 GHz were achieved. The thermal stability was evaluated by the temperature coefficient of resonant frequency (τf). The lowest τf values of -6.55 ppm/°C and -4.35 ppm/°C (near-zero) were measured to FMO and FMO mixed with 7.5 wt% Bi2O3-B2O3, respectively. Based on these results, FMO can be used to low permittivity ceramic for low temperature co-fired ceramics (LTCC) applications, antenna substrate, and millimeter-wave range.

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“…In ULTCC materials, the ceramics are co‐fired with aluminium electrode which has the melting point of 660 °C. Only a few ceramic systems based on tellurium,, molybdenum and vanadium with good dielectric properties are reported in literature for ULTCC applications. In the present work, phase pure and ultra low temperature sinterable Ba 3 Mg(V 2 O 7 ) 2 (BMV) and Ba 3 Zn(V 2 O 7 ) 2 (BZV) ceramics have been prepared through solid state ceramic route.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Microwave Dielectric Properties of Ba₃A(V₂O₇)₂ (A = Mg, Zn) Ceramics for ULTCC Applications

et al. 2019

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Single phase Ba3A(V2O7)2 (A = Mg, Zn) ceramics were prepared through a conventional solid‐state ceramic route. The structural and microwave dielectric properties of Ba3A(V2O7)2 (A = Mg, Zn) compositions have been investigated. Powder X‐ray diffraction and Raman spectroscopic studies have been carried out to confirm the phase purity and crystal structure of prepared Ba3A(V2O7)2 (A = Mg, Zn) compositions. Scanning electron microscopic images for Ba3A(V2O7)2 (A = Mg, Zn) ceramics exhibit a homogeneous and dense microstructure. The microwave dielectric properties of the samples were studied using Hakki–Coleman post resonator and cavity perturbation methods. Ba3Mg(V2O7)2 ceramic has a dielectric constant (εr) of 10.3, quality factor (Q x f ) of 43400 GHz and temperature coefficient of resonant frequency (τf) of –46.87 ppm/°C at 660 °C for 1 h. Ba3Zn(V2O7)2 shows a dielectric constant of 10.8, quality factor of 46400 GHz and temperature coefficient of resonant frequency of –78.1 ppm/°C at 660 °C for 1 h. Ba3A(V2O7)2 (A = Mg, Zn) ceramics show excellent chemical compatibility with Al metal electrodes.

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Synthesis and characterization of Na5M(MoO4)4 (M = Y, Yb) microwave ceramics for ULTCC applications

Cited by 45 publications

References 35 publications

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

Preparation and Microwave Dielectric Properties of Ba₃A(V₂O₇)₂ (A = Mg, Zn) Ceramics for ULTCC Applications

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Synthesis and characterization of Na5M(MoO4)4 (M = Y, Yb) microwave ceramics for ULTCC applications

Cited by 45 publications

References 35 publications

Ultra-low temperature cofired ceramics based on Li2WO4as perspective substrate materials for terahertz frequencies

Ultra-low temperature cofired ceramics based on Li2WO4as perspective substrate materials for terahertz frequencies

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

Preparation and Microwave Dielectric Properties of Ba3A(V2O7)2 (A = Mg, Zn) Ceramics for ULTCC Applications

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Product

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Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Preparation and Microwave Dielectric Properties of Ba₃A(V₂O₇)₂ (A = Mg, Zn) Ceramics for ULTCC Applications