Enhanced dielectric and microwave absorption properties of Y2Ti2O7 ceramics by Sr doping

Wen, Qinlong; Zhou, Weihua; Gao, Hui; Zhou, Yingying; Luo, Fa; Zhu, Dongmei; Huang, Zhibin; Qing, Yuchang

doi:10.1007/s00339-019-2702-x

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…In the La 1−x Sr x Co 0.9 Fe 0.1 O 3 system, there exist defects, oxygen vacancies and inhomogeneous distribution of grain sizes, which indicates that their polarization will be more than one relaxation process. 45 Eddy current loss enables the formation of an additional magnetic field that causes the cancellation of inherent magnetic field, leading to a negative permeability. 46 Generally, eddy current loss is described as follows: 47,48 μ″ % 2πμ 0 ðμ′Þ 2 σd 2 f =3…”

Section: Resultsmentioning

confidence: 99%

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The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo_0.9Fe_0.1O₃ perovskites

Wang

Zhao

et al. 2022

Inorg. Chem. Front.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo_0.9Fe_0.1O₃ perovskites

Wang

Zhao

et al. 2022

Inorg. Chem. Front.

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“…Figure 5b shows the imaginary part of dielectric permittivity of TiO2-Sr1-xLaxTiO3 with three doping contents (x=0.1~0.3). According to the Debey theory, ′′ can be determined as follows [29].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Thin and temperature-resistant TiO2–Sr1−xLaxTiO3 (x = 0.1–0.3) composite ceramics for microwave absorption in the X-band

Zhou

Wen

Yang

et al. 2021

J Mater Sci: Mater Electron

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Recently, high-temperature stability is a challenge in a number of microwave absorption materials. Hence, researchers are still searching for a novel material system preferably with a high-temperature resistance to be applied in the field of microwave absorption. Here, in the current study, toward this aim, lanthanum (La) doped strontium titanate (SrTiO3) blended with TiO2 were fabricated by hot-press sintering in vacuum. The as-prepared samples are denoted as TiO2-Sr1-xLaxTiO3 with x varying from 0.1 to 0.3 in steps of 0.1. Scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), and microwave vector network analyzer were carried on to study their morphology, phase composition, structure, electromagnetic and microwave absorption properties, respectively. It is revealed that the La atom was efficiently doped at the Sr-site in SrTiO3. Benefiting from the tunability of its dielectric and impedance properties, TiO2-Sr1-xLaxTiO3 can be utilized in a highly efficient way to absorb microwave radiations with a decent design. Results illustrated that TiO2-Sr1-xLaxTiO3 (x=0.2) with a thickness of only 0.42 mm exhibits a high microwave absorption efficiency of -40.89 dB and can achieve a 2.82 GHz bandwidth of reflection loss value below -5 dB. Thus, TiO2-Sr1-xLaxTiO3 composites ceramics can be served as an opening opportunity for the application of high-temperature stability and tunable high-performance effectiveness microwave absorption materials in stealth technology and information security.

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“…Most of the techniques for the synthesis of the Y 2 Ti 2 O 7 phase can be divided into two main groups: (i) mechanically assisted annealing methods and (ii) wet chemical methods. For the former one, for example, milling and hot isostatic pressure techniques are used [ 30 , 31 ] for TiO 2 and Y 2 O 3 powders in a 2:1 molar ratio, where a typically long (~few hours) and high-temperature (>1000 °C) annealing process takes place. Wet chemical methods, such as the co-precipitation technique and sol–gel method, usually allow lower synthesis temperature (~800 °C) alternatives [ 32 , 33 ]; however, they can be more time-consuming and demanding, complicated methods.…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Micro-Combinatorial TEM Phase Mapping of the DC Magnetron Sputtered YxTi1−xOy Thin Layer System

Olasz,

Kis,

Cora

et al. 2024

Nanomaterials

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High-throughput methods are extremely important in today’s materials science, especially in the case of thin film characterization. The micro-combinatorial method enables the deposition and characterization of entire multicomponent thin film systems within a single sample. In this paper, we report the application of this method for the comprehensive TEM characterization of the Y-Ti-O layer system. Variable composition samples (YxTi1−xOy) were prepared by dual DC magnetron sputtering, covering the entire (0 ≤ x ≤ 1) concentration range. The structure and morphology of phases formed in both as-deposited and annealed samples at 600, 700, and 800 °C were revealed as a function of Y-Ti composition (x). A comprehensive map showing the appropriate amorphous and crystalline phases, and their occurrence regions of the whole Y-Ti-O layer system, was revealed. Thanks to the applied method, it was shown with ease that at the given experimental conditions, the Y2Ti2O7 phase with a pyrochlore structure forms already at 700 °C without the TiO2 and Y2O3 by-phases, which is remarkably lower than the required temperature for most physical preparation methods, demonstrating the importance and benefits of creating phase maps in materials science and technology.

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Enhanced dielectric and microwave absorption properties of Y2Ti2O7 ceramics by Sr doping

Cited by 9 publications

References 26 publications

The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo_0.9Fe_0.1O₃ perovskites

The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo_0.9Fe_0.1O₃ perovskites

Thin and temperature-resistant TiO2–Sr1−xLaxTiO3 (x = 0.1–0.3) composite ceramics for microwave absorption in the X-band

High-Throughput Micro-Combinatorial TEM Phase Mapping of the DC Magnetron Sputtered YxTi1−xOy Thin Layer System

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Enhanced dielectric and microwave absorption properties of Y2Ti2O7 ceramics by Sr doping

Cited by 9 publications

References 26 publications

The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo0.9Fe0.1O3 perovskites

The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo0.9Fe0.1O3 perovskites

Thin and temperature-resistant TiO2–Sr1−xLaxTiO3 (x = 0.1–0.3) composite ceramics for microwave absorption in the X-band

High-Throughput Micro-Combinatorial TEM Phase Mapping of the DC Magnetron Sputtered YxTi1−xOy Thin Layer System

Contact Info

Product

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The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo_0.9Fe_0.1O₃ perovskites

The effect of Sr doping on the electronic structure and electromagnetic properties of LaCo_0.9Fe_0.1O₃ perovskites