Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO3–(1−x)LaAlO3 Ceramics with <scp>LTCC</scp> Application

Lei, Shenhui; Fan, Huiqing; Chen, Weina; Liu, Zhiyong; Li, Mengmeng

doi:10.1111/jace.14548

Cited by 43 publications

(5 citation statements)

References 49 publications

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“…The dielectric constants are 20.53, 19.53, 21.58, and 19.01 for pure Li 2 TiO 3 , LTM, LTN, and LTMN, respectively. An important factor which influences the dielectric constant in microwave dielectric ceramics is the average ionic polarizability (α theo / V m ) . And it can be determined by the modified Clausius‐Mossotti equation as follows:…”

Section: Resultsmentioning

confidence: 99%

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

et al. 2018

J Am Ceram Soc

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In order to solve the problems of acceptor/donor individual doping in Li2TiO3 system and clarify the superiority mechanism of co‐doping for improving the Q value, Mg + Nb co‐doped Li2TiO3 have been designed and sintered at a medium temperature of 1260°C. The effects of each Mg/Nb ion on structure, morphology, grain‐boundary resistance and microwave dielectric properties are investigated. The substitution of (Mg1/3Nb2/3)4+ inhibits not only the diffusion of Li+ and reduction in Ti4+, but also the formation of microcracks in ceramics, which promotes the enhancement of Q value. The experiments reveal that Q × f value of Li2TiO3 ceramics co‐doped with magnesium and niobium is 113 774 GHz (at 8.573 GHz), which is increased by 113% compared with the pure Li2TiO3 ceramics. And the co‐doped ceramics have an appropriate dielectric constant of 19.01 and a near‐zero resonance frequency temperature coefficient of 13.38 ppm/°C. These results offer a scientific basis for co‐doping in Li2TiO3 system, and the outstanding performance of (Mg + Nb) co‐doped ceramics provides a solid foundation for widespread applications of microwave substrates, resonators, filters and patch antennas in modern wireless communication equipments.

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Section: Resultsmentioning

confidence: 99%

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

et al. 2018

J Am Ceram Soc

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“…MWDCs have many systems but the perovskite-structured (1-x)MTiO 3 -xNAlO 3 (M = Sr, Ca; N = La, Nd, Sm) system has attracted great research attention due to its excellent microwave dielectric properties [7][8][9][10][11]. Moon et al [12] developed the 0.65CaTiO 3 -0.35LaAlO 3 ceramics with remarkable performance of ε r = 37, Q×f = 47,000 GHz, τ f = −5 ppm/℃.…”

Section: Introductionmentioning

confidence: 99%

CaV2O6: A highly effective sintering aid for 0.61CaTiO3-0.39LaAlO3 ceramics

Chen

Yang

Guo

et al. 2021

Preprint

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The 0.61CaTiO3-0.39LaAlO3 (CTLA) ceramics are widely used in relay station, aerospace and radar systems for their superior properties: remarkable quality factor and excellent thermal stability. However, some deficiencies remain, such as low permittivity and excessively high sintering temperature, which limit their development in microwave communication. Herein, we introduce CaV2O6 to the CTLA ceramics to solve these problems and systematically investigate its effects on sintering temperature, phase constitution, microstructure and microwave dielectric properties. The CTLA ceramics added with 0–2.0 wt% CaV2O6 were prepared by the traditional solid-state reaction procedure. The XRD patterns indicated that the pure phase Ca0.61La0.39Al0.39Ti0.61O3 (PDF #52-1773) was obtained from all samples, which revealed that the CaV2O6 was dissolved into CTLA lattice to form a solid solution. As the CaV2O6 content increased, the strongest X-ray diffraction peaks gradually shifted toward low angles, which manifested the increase of cell volume of the solid solution. When the additive amount was 1.0 wt%, the CaV2O6 could high-effectively lower the sintering temperature from 1450 ℃ to 1290 ℃ and obviously promote the growth of grains. Meanwhile, the εr slightly increased, the Q×f significantly improved and the τf favorably decreased to closer to zero, then the prominent microwave dielectric performance was exhibited, with εr = 40.6, Q×f = 48,800 GHz (at 4.5 GHz), and τf = 0.78 ppm/℃. Such CTLA ceramics are expected to promote the development of high-performance and temperature-stable microwave components.

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“…With the rapid development of multifunctional communication technology, microwave dielectric ceramics due to excellent performance were widely applied to the integrated devices, such as substrates, dielectric antennae, capacitors, resonators, and filters . A large number of applications required microwave materials with a low permittivity to diminish propagation delay of the signal, a high Q*f to reduce power loss, a near‐zero temperature coefficient to improve thermal stability, and a low sintering temperature to co‐fire with Ag electrode …”

Section: Introductionmentioning

confidence: 99%

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

et al. 2019

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Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO₃–(1−x)LaAlO₃ Ceramics with LTCC Application

Cited by 43 publications

References 49 publications

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

CaV2O6: A highly effective sintering aid for 0.61CaTiO3-0.39LaAlO3 ceramics

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

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Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO3–(1−x)LaAlO3 Ceramics with LTCC Application

Cited by 43 publications

References 49 publications

High‐Q microwave ceramics of Li2TiO3 co‐doped with magnesium and niobium

High‐Q microwave ceramics of Li2TiO3 co‐doped with magnesium and niobium

CaV2O6: A highly effective sintering aid for 0.61CaTiO3-0.39LaAlO3 ceramics

Crystal structure, densification, and microwave dielectric properties of Li3Mg2(Nb(1−x)Mox)O6+x/2 (0 ≤ x ≤ 0.08) ceramics

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Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO₃–(1−x)LaAlO₃ Ceramics with LTCC Application

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics