Low-temperature sintering and microwave dielectric properties of Li3MO4 (M=Ta, Sb) ceramics

Pang, Li‐Xia; Liu, Huan; Zhou, Di; Yang, Jiaxing; Li, Dang-Juan; Liu, Weiguo

doi:10.1016/j.jallcom.2012.02.047

Cited by 31 publications

(3 citation statements)

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“…In our previous work, [3,[8][9][10][11][12] a series of ultralow-temperature-firing microwave dielectric ceramics with low (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20), medium , and high k values (Ͼ40) have been explored. Among them, Bi 2 Mo 2 O 9 seems to be very promising owing to its ultralow sintering temperature of ca.…”

Section: Introductionmentioning

confidence: 99%

“…[3,8] These approaches challenge the earlier and established microwave materials and open up the possibility for new ultralow-temperature firing technology for microwave dielectric ceramics and components. 5 of the (AgBi) 0.5 WO 4 sample calcined at 400°C for 4 h, the expected (AgBi) 0.5 WO 4 phase started to form, and the chemical reaction is as follows [Equation (1)]. Figure 1 shows the XRD patterns of (AgBi) 0.5 WO 4 samples calcined at different temperatures and sintered at 600°C for 2 h and those of samples cofired with 30 wt.-% silver and 30 wt.-% aluminum.…”

Section: Introductionmentioning

confidence: 99%

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Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)_0.5WO₄ Ceramic

et al. 2013

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A new microwave dielectric (AgBi) 0.5 WO 4 ceramic with an ultralow firing temperature was prepared by the solid-state reaction method. (AgBi) 0.5 WO 4 can be obtained as a dense single-phase bulk material with a calcination temperature of 500°C and sintering temperatures of ca. 580°C. The material has a microwave relative permittivity of ca. 35.9, a Qf value of ca. 13000 GHz, and a negative temperature coefficient of -69 ppm/°C at 7.5 GHz. The crystal structure of (AgBi) 0.5 WO 4 was determined by a combination of X-ray and transmission electron microscopy (TEM) diffraction analysis. The compound crystallizes in the monoclinic C12/m1 (no. 12) space [a] [b] Ministry-province jointly-constructed cultivation base for state key laboratory of processing for non-ferrous metal and featured materials, Guangxi Zhuang Autonomous Region, China [c] Micro-

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)_0.5WO₄ Ceramic

et al. 2013

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“…1 Recently, mach attention had been paid to Li-containing compounds such as Li 2 WO 4 , Li 2 MoO 4 , Li 3 AO 4 (A = Nb, Ta, Sb), and Li 2 TiO 3 due to their relative low sintering temperatures and excellent microwave dielectric properties. [2][3][4][5][6][7][8] Li 2 TiO 3 ceramics, which have good microwave dielectric properties of e r = 20-24, Q 9 f = 40 000-70 000 (GHz), and s f = +20 ppm/°C, belong to rock salt structure. Pang and Zhou used Zr and Sn to substitute for Ti-site of Li 2 TiO 3 ceramics, and then obtained the small dielectric constants.…”

Section: Introductionmentioning

confidence: 99%

Novel Temperature Stable Li₂MnO₃ Dielectric Ceramics with High Q for LTCC Applications

Tseng

Chang

et al. 2014

J. Am. Ceram. Soc.

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Novel microwave dielectric ceramics in the Li2MnO3 system with high Q prepared through a conventional solid‐state route had been investigated. All the specimens exhibited single phase ceramics sintered in the temperature range 1140°C–1230°C. The microwave dielectric properties of Li2MnO3 ceramics were strongly correlated with sintering temperature and density. The best microwave dielectric properties of εr = 13.6, Q × f = 97 000 (GHz), and τf = −5.2 ppm/°C could be obtained as sintered at 1200°C for 4 h. BaCu(B2O5) (BCB) could effectively lower the sintering temperature from 1200°C to 930°C and slightly induced degradation of the microwave dielectric properties. The Li2MnO3 ceramics doped with 2 wt% BaCu(B2O5) had excellent dielectric properties of εr = 11.9, Q × f = 80 600 (GHz), and τf = 0 ppm/°C. With low sintering temperature and good dielectric properties, the BCB added Li2MnO3 ceramics are suitable candidates for LTCC applications in wireless communication system.

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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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Low-temperature sintering and microwave dielectric properties of Li3MO4 (M=Ta, Sb) ceramics

Cited by 31 publications

References 20 publications

Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)_0.5WO₄ Ceramic

Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)_0.5WO₄ Ceramic

Novel Temperature Stable Li₂MnO₃ Dielectric Ceramics with High Q for LTCC Applications

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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Low-temperature sintering and microwave dielectric properties of Li3MO4 (M=Ta, Sb) ceramics

Cited by 31 publications

References 20 publications

Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)0.5WO4 Ceramic

Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)0.5WO4 Ceramic

Novel Temperature Stable Li2MnO3 Dielectric Ceramics with High Q for LTCC Applications

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)_0.5WO₄ Ceramic

Crystal Structure and Microwave Dielectric Properties of an Ultralow‐Temperature‐Fired (AgBi)_0.5WO₄ Ceramic

Novel Temperature Stable Li₂MnO₃ Dielectric Ceramics with High Q for LTCC Applications