Improvement in microwave dielectric properties of Sr2TiO4 ceramics through post-annealing treatment

Luo, Yu; Zhang, Jie; Yue, Zhenxing; Li, Longtu

doi:10.1007/s10832-018-0160-z

Cited by 17 publications

(4 citation statements)

References 23 publications

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“…TSDC technique can provide valuable information on the types and concentrations of defects in dielectrics, and has been widely used to explore the dielectric response mechanism of ceramics [36,[62][63][64][65][66][67][68][69]. Liu and Randall [62] firstly reported the method for determining the types of defects in inorganic dielectrics through the changes in peak position (T m , the temperature at which the absolute value of current density is maximized) and peak intensity (J m , the maximum of the absolute value of current density) of the TSDC curves with various polarization conditions (T p and E p ), and Zhang et al [67] applied this method to microwave dielectric ceramics for the first time.…”

Section: Resultsmentioning

confidence: 99%

“…Since the position of peak D 2 is similar to that of peak D 1 , it is speculated that the relaxation mechanisms of the two are the same, so that it can be considered that peak D 2 is also related to the relaxation of the across-grain-boundary O V  . TSDC peaks with higher J m imply a higher concentration of the corresponding defects [69,72]. Comparing the TSDC curves of the three ceramic samples, the BNT ceramics with peak D 1 in Fig.…”

Section: Almentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Almentioning

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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“…of Sr TiO , make it suitable for wireless passive temperature sensors application [141]. Properties of the solid solution of these two oxides have been also studied by Dai et al For Sr Ce .…”

Section: Microwave Dielectric Materialsmentioning

confidence: 98%

“…)O ) with increase in dielectric constant [134]. Although, for these ceramics, the dielectric constant is high but higher value limits its practical application in commercial microwave devices, such as dielectric resonators and filters [141]. Recently, Sr TiO and Sr CeO were also studied for low loss microwave dielectric applications by Liu et al and Dai et al, respectively.…”

Section: Microwave Dielectric Materialsmentioning

confidence: 99%

Ruddlesden-Popper phase A2BO4 oxides: Recent studies on structure, electrical, dielectric, and optical properties

2020

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In the last two decades, structure and properties of Ruddlesden-Popper phase (RP) A 2 BO 4 oxides with K 2 NiF 4 structure, have been widely investigated. But to the best of our knowledge, no review article is available in the literature on recent studies on these oxides. Therefore, in this article, recent studies on structure, electrical, dielectric, and optical properties of these oxides have been reviewed. Special attention is put on to highlight the effect of doping and oxygen stoichiometry on the structure and properties of these oxides. Further, important applications of these oxides have also been mentioned in this article.

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Scaling behavior of AC conductivity and modulus spectra of K2NiO4-type Sr2TiO4

Mittal,

Baranwal,

Kumar

et al. 2024

emergent mater.

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Improvement in microwave dielectric properties of Sr2TiO4 ceramics through post-annealing treatment

Cited by 17 publications

References 23 publications

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

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

Ruddlesden-Popper phase A2BO4 oxides: Recent studies on structure, electrical, dielectric, and optical properties

Scaling behavior of AC conductivity and modulus spectra of K2NiO4-type Sr2TiO4

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