Microwave dielectric properties of Li2MgTi3O8 ceramics produced by reaction-sintering method

Yao, Guo Guang; Liu, P.; Zhang, H. W.

doi:10.1007/s10854-012-0894-3

Cited by 16 publications

(3 citation statements)

References 19 publications

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“…According to grain boundary scattering theory, grain boundaries and defects are the scattering centers of microwave radiation, and the reduction in grain boundaries leads to the scattering of less radiation in ceramic samples, thus reducing the dielectric loss and increasing Q × f . 29–31 As the ceramic density decreases and high temperature sintering produces more defects, Q × f begins to decrease when the sintering temperature continues to increase.…”

Section: Resultsmentioning

confidence: 99%

“…When the sintering temperature changes from 825 1C to 850 1C, the reason for the increase in Q Â f is that the grain size of the ceramic increases from 2.70 mm to 3.61 mm, and the decrease of the number of grains per unit volume leads to the decrease of the area of grain boundaries per unit volume. According to grain boundary scattering theory, grain boundaries and defects are the scattering centers of microwave radiation, and the reduction in grain boundaries leads to the scattering of less radiation in ceramic samples, thus reducing the dielectric loss and increasing Q Â f. [29][30][31] As the ceramic density decreases and high temperature sintering produces more defects, Q Â f With the change in sintering temperature, the t f value fluctuates between À13.68 ppm 1C À1 and À9.50 ppm 1C À1 . Compared to the t f value of LMT ceramics doped with TiN, the absolute value of t f increased.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Deng,

Qu,

Gao

et al. 2023

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Deng,

Qu,

Gao

et al. 2023

J. Mater. Chem. C

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“…15 Many ceramic materials such as Ba 2 Ti 9 O 20 , CaNb 2 O 6 , Ba 5 Nb 4 O 15 , and Li 2 MgTi 3 O 8 have also been prepared by the reaction-sintering process. [16][17][18][19] In this work, LZT ceramics were synthesized using nanosized TiO 2 reagent to study the effect of this reagent and the reaction-sintering process on the densification, phase distribution, microstructure, and dielectric properties. We attempted to promote the Q Â f value and also to enhance the s f value of the LZT ceramic through the formation of TiO 2 secondary phase at high sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution, Microstructure, and Microwave Dielectric Properties of Reaction-Sintered Li2ZnTi3O8 Ceramic Obtained Using Nanosized TiO2 Reagent

Bari

Taheri-Nassaj

Taghipour-Armaki

2015

Journal of Elec Materi

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Dielectric ceramics in the Li 2 ZnTi 3 O 8 system were synthesized using TiO 2 nanoparticle reagent by the reaction-sintering process. The special effects of the TiO 2 nanoparticle reagent on the densification, phase distribution, microstructure, and dielectric properties were characterized using powder x-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). A single phase of Li 2 ZnTi 3 O 8 ceramic was confirmed by the XRD pattern at all temperatures except 1075°C. The reaction between the starting materials was accelerated using TiO 2 nanoparticles, with pure Li 2 ZnTi 3 O 8 phase being created even at low sintering temperature of 900°C, along with increasing green specimen density at the compaction stage. The presence of TiO 2 phase in the Li 2 ZnTi 3 O 8 ceramic improved the s f value and shifted it to near zero at 1075°C, and the ceramic exhibited excellent microwave dielectric properties of e r = 23.5, Q Â f = 71,000 GHz, and s f = À3.5 ppm/°C.

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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 Li2MgTi3O8 ceramics produced by reaction-sintering method

Cited by 16 publications

References 19 publications

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Phase Evolution, Microstructure, and Microwave Dielectric Properties of Reaction-Sintered Li2ZnTi3O8 Ceramic Obtained Using Nanosized TiO2 Reagent

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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Microwave dielectric properties of Li2MgTi3O8 ceramics produced by reaction-sintering method

Cited by 16 publications

References 19 publications

Enhanced flexural strength and microwave dielectric properties of Li2MgTi3O8-based low temperature co-fired ceramics

Enhanced flexural strength and microwave dielectric properties of Li2MgTi3O8-based low temperature co-fired ceramics

Phase Evolution, Microstructure, and Microwave Dielectric Properties of Reaction-Sintered Li2ZnTi3O8 Ceramic Obtained Using Nanosized TiO2 Reagent

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics