Microwave dielectric properties of scheelite (A=Ca, Sr, Ba) and wolframite (A=Mg, Zn, Mn) AMoO4 compounds

Choi, Geun-Kyu; Kim, Jeong-Ryeol; Yoon, Sung Hun; Hong, Kug Sun

doi:10.1016/j.jeurceramsoc.2006.11.037

Cited by 270 publications

(136 citation statements)

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“…This fact suggests the presence of WO 4 tetrahedra in crystal lattice of Pb 1-3x h x Pr 2x (MoO 4 ) 1-3x (WO 4 ) 3x [48,49]. The appearance of additional absorption band and a change in its position suggests the presence of other types of molybdenum and tungsten polyhedra, i.e., distorted MoO 4 as well as WO 4 tetrahedra with cationic vacancy near one or two corners of MoO 4 and WO 4 . The same phenomenon has been observed in the case of a similar solid solution with gadolinium ions (Cd 1-3x h x Gd 2x MoO 4 ) [33,34].…”

Section: Results and Discussion Xrd And Ir Studiesmentioning

confidence: 96%

“…Appropriate DTA-TG studies of obtained ceramic materials were preceded by similar studies for PbMoO 4 and Pr 2 (WO 4 ) 3 . Figure 6 shows DTA curves of PbMoO 4 (TG curve is not presented here) recorded during heating and cooling runs.…”

Section: Dta-tg Studiesmentioning

confidence: 99%

“…Divalent metal molybdates and tungstates (AMO 4 , where M = Ca, Sr, Ba, Ca, Cd, and Pb; M = Mo or W) have wide industrial applications in many fields. They have been used as laser host materials, Raman lasers, optical fibers, humidity sensors, magnetic and photoluminescence materials, and catalysts [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…They have been used as laser host materials, Raman lasers, optical fibers, humidity sensors, magnetic and photoluminescence materials, and catalysts [1][2][3][4][5][6][7][8][9][10][11][12][13]. Among them, lead molybdate and lead tungstate are very attractive materials because of their applications as acousto-optical modulators, deflectors, ion conductors, and solid-state scintillators for a nuclear instrumental application [14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Our earlier studies on a reactivity in a solid state of divalent metal molybdates or tungstates (CdMoO 4 , CdWO 4 and others) with rare-earth compounds (molybdates or tungstates) have been showed an existence of new interesting materials for applications in optoelectronics [25][26][27][28][29][30][31][32][33][34]. The scheelite-type ceramic materials, i.e., Cd 0.25 RE 0.50-h 0.25 WO 4 (RE = Pr, Nd, Sm, Eu, and Gd, vacancy is denoted by h), were synthesized via a solid-state reaction of CdWO 4 with rare-earth ditungstates RE 2 W 2 O 9 [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, structure, and thermal stability of new scheelite-type Pb1−3x□xPr2x(MoO4)1−3x(WO4)3x ceramic materials

Piątkowska

Tomaszewicz

2016

J Therm Anal Calorim

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Section: Results and Discussion Xrd And Ir Studiesmentioning

confidence: 96%

Section: Dta-tg Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, structure, and thermal stability of new scheelite-type Pb1−3x□xPr2x(MoO4)1−3x(WO4)3x ceramic materials

Piątkowska

Tomaszewicz

2016

J Therm Anal Calorim

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List of Low‐Loss Ceramic Dielectric Materials and Their Properties

2017

Microwave Materials and Applications 2V Set

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AbbreviationsST = sintering temperature ( • C) r = relative permittivity , f = measurement frequency (GHz) f = coefficient of temperature variation of resonant frequency (ppm/ • C) No. = serial number Qf = quality factor frequency product (GHz)The table lists the key property data of microwave dielectric materials available from published materials. These data are the relative permittivity ( r ), the product of the Q-factor and the frequency (Qf ), the frequency of measurement (f), and the temperature coefficient of the resonant frequency ( f ). In tabulating these data, we make no judgment on the measurement method and the reliability of the result. It is known that the ceramic properties such as porosity, grain size, raw materials used, impurities, measurement methods, and equipment used for measurements affect the dielectric properties and readers should be aware that exact comparison of data on materials of identical composition and manufactured in different laboratories using different processing conditions and measured by different methods would be expected to lead to small variations in properties. The data of dielectric measurements carried out using impedance methods at low (MHz) frequency is excluded as the errors in these methods mean that a loss tangent less than 10 −3 is unreliable. The data are arranged in the order of increasing relative permittivity. The quality factor of the microwave dielectric ceramics decrease significantly with increasing relative permittivity, as shown in Figure A.1. The inset in the figure shows the variation of quality factor frequency product with Microwave Materials and Applications, First Edition. Edited by Mailadil T. Sebastian, Rick Ubic and Heli Jantunen.

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Microwave dielectric properties of Li₂M₂(MoO₄)₃ (M = Co, Ni) for LTCC applications

Huang

Liou

Tsai

et al. 2020

Int J Ceramic Engine & Sci

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Two low-firing Li 2 M 2 (MoO 4 ) 3 (M = Co, Ni) dielectrics were prepared, and their microwave dielectric properties were investigated. The XRD patterns indicated both samples crystallized in an orthorhombic structure with different space groups. The microstructures, lattice parameters, and Raman spectra of these ceramics were also systematically studied. The microwave dielectric properties were obtained with ε r ~ 9.1, Q × f ~ 34 000 GHz and τ f ~ −72 ppm/°C for Li 2 Co 2 (MoO 4 ) 3 at 840°C, ε r ~ 9.6, Q × f ~ 28 000 GHz and τ f ~ −71 ppm/°C for Li 2 Ni 2 (MoO 4 ) 3 at 660°C. With 0.05 mol% Zn substitution, excellent microwave dielectric properties (ε r ~ 10.9, Q × f ~ 56 000 GHz and τ f ~ −62 ppm/°C) can be obtained for Li 2 (Ni 0.95 Zn 0.05 ) 2 (MoO 4 ) 3 at 660°C, indicating a very promising dielectric for LTCC or ULTCC applications at high frequencies. K E Y W O R D S dielectric materials/properties, electroceramics, microwaves How to cite this article: Huang C-L, Liou J-N, Tsai M-H, Huang W-C. Microwave dielectric properties of Li 2 M 2 (MoO 4 ) 3 (M = Co, Ni) for LTCC applications. Int J Ceramic Eng Sci. 2020;2:130-139. https://doi.

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Microwave dielectric properties of scheelite (A=Ca, Sr, Ba) and wolframite (A=Mg, Zn, Mn) AMoO4 compounds

Cited by 270 publications

References 11 publications

Synthesis, structure, and thermal stability of new scheelite-type Pb1−3x□xPr2x(MoO4)1−3x(WO4)3x ceramic materials

Synthesis, structure, and thermal stability of new scheelite-type Pb1−3x□xPr2x(MoO4)1−3x(WO4)3x ceramic materials

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

Microwave dielectric properties of Li₂M₂(MoO₄)₃ (M = Co, Ni) for LTCC applications

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Microwave dielectric properties of scheelite (A=Ca, Sr, Ba) and wolframite (A=Mg, Zn, Mn) AMoO4 compounds

Cited by 270 publications

References 11 publications

Synthesis, structure, and thermal stability of new scheelite-type Pb1−3x□xPr2x(MoO4)1−3x(WO4)3x ceramic materials

Synthesis, structure, and thermal stability of new scheelite-type Pb1−3x□xPr2x(MoO4)1−3x(WO4)3x ceramic materials

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

Microwave dielectric properties of Li2M2(MoO4)3 (M = Co, Ni) for LTCC applications

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Microwave dielectric properties of Li₂M₂(MoO₄)₃ (M = Co, Ni) for LTCC applications