Microstructures and microwave dielectric properties of (Ba1−xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 solid solutions

Huang, Xiaomin; Liu, Xinyu; Liu, Fei; Yuan, Changlai; Qu, Jingjing; Xu, Jiwen; Zhou, Changrong; Chen, Guohua

doi:10.1007/s40145-016-0217-x

Cited by 17 publications

(4 citation statements)

References 28 publications

(26 reference statements)

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“…6 2 were weighted in stoichiometry ratios and ball milled for 10 h using Y-stabilized ZrO 2 balls as grinding media and isopropanol as lubricant to make slurries. The slurries were dried over night in an oven at ~95 ℃.…”

Section: * Corresponding Authormentioning

confidence: 99%

“…The development of microwave communication technology such as cellular phone, car telephone, bluetooth technology, radar technology, global positioning system (GPS), direct TV broadcasting, intelligent transport system (ITS), and wireless local area network (WLAN) has been promoted via microwave dielectric ceramics [1,2]. The shift of operating frequency band from 900 MHz to 2.4, 4, 5, 5.2 GHz, or even to 5.8 GHz renders high r  materials of less interest [3,4].…”

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confidence: 99%

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Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

et al. 2018

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Section: * Corresponding Authormentioning

confidence: 99%

mentioning

confidence: 99%

Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

et al. 2018

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“…In order to meet the requirements of device miniaturization, microwave dielectric ceramics having medium/high relative dielectric constants (ε r ) have been the focus of researches [6,7], including TiO 2 [8,9], Ba 6−3x Ln 8+2x Ti 18 O 54 (BLT, where Ln = rare earth element) [10,11], CaO-Li 2 O-Ln 2 O 3 -TiO 2 [12,13], Ca 1−x Ln 2x/3 TiO 3 (CLT) [14][15][16], lead-based perovskite [17,18], etc. In recent years, BLT with a tungsten-bronze structure and CLT with a perovskite structure have been extensively studied [19][20][21][22][23][24]. Meanwhile, novel ceramic systems such as Bi 2 (Li 0.5 Ta 1.5 )O 7 [25,26] and BiVO 4 [27,28] have also been developed.…”

Section: Introduction mentioning

confidence: 99%

Structure, defects, and microwave dielectric properties of Al-doped and Al/Nd co-doped Ba4Nd9.33Ti18O54 ceramics

Guo

Luo

et al. 2022

J Adv Ceram

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Low-loss tungsten—bronze microwave dielectric ceramics are dielectric materials with potential application value for miniaturized dielectric filters and antennas in the fifth-generation (5G) communication technology. In this work, a novel Al/Nd co-doping method of Ba4Nd9.33Ti18O54 (BNT) ceramics with a chemical formula of Ba4Nd9.33+z/3Ti18−zAlzO54 (BNT—AN, 0 ≼ z ≼ 2) was proposed to improve the dielectric properties through structural and defect modulation. Together with Al-doped ceramics (Ba4Nd9.33Ti18−zAl4z/3O54, BNT—A, 0 ≼ z ≼ 2) for comparison, the ceramics were prepared by a solid state method. It is found that Al/Nd co-doping method has a significant effect on improving the dielectric properties compared with Al doping. As the doping amount z increased, the relative dielectric constant (εr) and the temperature coefficient of resonant frequency (τf) of the ceramics decreased, and the Q×f values of the ceramics obviously increased when z ≼ 1.5. Excellent microwave dielectric properties of εr = 72.2, Q×f = 16,480 GHz, and τf = +14.3 ppm/°C were achieved in BNT—AN ceramics with z = 1.25. Raman spectroscopy and thermally stimulated depolarization current (TSDC) technique were firstly combined to analyze the structures and defects in microwave dielectric ceramics. It is shown that the improvement on Q×f values was originated from the decrease in the strength of the A-site cation vibration and the concentration of oxygen vacancies $$\text{V}_\text{O}^{^{ \cdot \cdot }}$$, demonstrating the effect and mechanism underlying for structural and defect modulation on the performance improvement of microwave dielectric ceramics.

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“…As reported, the substitution of Sr 2+ for Ba 2+ could also tune τ f to near zero for BLT ceramics, and the effect of the substitution on the Q × f value has a close relationship with the x value. Specifically, when x is far from the value of 2/3, the Q × f values could be improved with the substitution of Sr 2+ , but when x is close to the value of 2/3, they decrease . In addition, Kim et al reported that ε r could be increased by replacing the Ln ions with a small amount of Bi 3+ , and the Q × f values could be simultaneously improved slightly .…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties and thermally stimulated depolarization of Al‐doped Ba₄(Sm,Nd)_9.33Ti₁₈O₅₄ ceramics

et al. 2019

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Ba4(Sm0.15Nd0.85)9.33Ti18‐zAl3z/4O54 (BSNT‐zAl, 0.0 ≤ z ≤ 2.5) ceramics were prepared via a solid‐state reaction, and the effects of Al doping on the microwave dielectric properties and defect behavior of the title compound were studied. X‐ray diffraction (XRD) analysis and scanning electron microscopy (SEM) photographs suggested that Al ions successfully entered the lattice to form tungsten‐bronze‐like solid solutions. With a small amount of Al substitution, the relative dielectric constant (εr), and the temperature coefficient of resonant frequency (τf) values decreased, whereas the quality factor (Q × f) substantially increased by approximately 50%. The defect‐related extrinsic dielectric loss was clarified via the thermally stimulated depolarization current (TSDC) technique. With Al doping, the TSDC relaxation of across‐grain‐boundary oxygen vacancies (VO..) vanished, whereas that of defect dipoles (AlTi′-VO..) appeared at relatively low temperatures. Therefore, in the BSNT‐zAl ceramics, oxygen vacancies were more inclined to interconnect with AlTi′ to form defect dipoles. This could reduce the activity of VO.. and account for the notable improvement in the Q × f values. In particular, the excellent characteristics of εr = 67.33, Q × f = 16 530 GHz, and τf = +0.87 ppm/°C were achieved in the specimens with z = 1.5 sintered at 1350°C for 4 hours.

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Microstructures and microwave dielectric properties of (Ba1−xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 solid solutions

Cited by 17 publications

References 28 publications

Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

Structure, defects, and microwave dielectric properties of Al-doped and Al/Nd co-doped Ba4Nd9.33Ti18O54 ceramics

Microwave dielectric properties and thermally stimulated depolarization of Al‐doped Ba₄(Sm,Nd)_9.33Ti₁₈O₅₄ ceramics

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Microstructures and microwave dielectric properties of (Ba1−xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 solid solutions

Cited by 17 publications

References 28 publications

Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

Phase microstructure evaluation and microwave dielectric properties of (1–x)Mg0.95Ni0.05Ti0.98Zr0.02O3–xCa0.6La0.8/3TiO3 ceramics

Structure, defects, and microwave dielectric properties of Al-doped and Al/Nd co-doped Ba4Nd9.33Ti18O54 ceramics

Microwave dielectric properties and thermally stimulated depolarization of Al‐doped Ba4(Sm,Nd)9.33Ti18O54 ceramics

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Microwave dielectric properties and thermally stimulated depolarization of Al‐doped Ba₄(Sm,Nd)_9.33Ti₁₈O₅₄ ceramics