Enhanced dielectric properties of barium strontium titanate thin films by doping modification

Gao, Libin; Guan, Zhipu; Huang, Shixian; Liang, Kexin; Chen, Hongwei; Zhang, Jihua

doi:10.1007/s10854-019-01670-w

Cited by 35 publications

(12 citation statements)

References 108 publications

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“…Therefore, we can conclude that the lower dielectric loss of thin films annealed with ACB may be mainly related to the lower content of oxygen vacancies. It should be noted that the dielectric loss of thin films can be further reduced at a millimeter-wave-band as reported in previous researches [44,45]. Furthermore, simulation results (supplementary Figure S5) also confirm that the device based on our thin films annealed with ACB possesses lower insertion loss (less than dB = 0:328) and very high phase-shift-ability (up to 170 °) at a microwave band (~36 GHz), indicating an excellent dielectric tunable performance.…”

Section: T(k) 2 0 H W I T H a C B 1 5 H W I T H A C B 1 0 H W I T H A...supporting

confidence: 68%

B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

Peng

Wang

et al. 2022

Research

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Tunable devices constructed by ferroelectric thin films are often desired to possess a low dielectric loss while maintainging a high dielectric tunability over a broad operating temperature range in applications, for example, resonators, filters, or phase shifters. However, it is difficult to simultaneously achieve these characteristics by traditional strategies, such as doping and strain modifying. Here, we demonstrate that the dielectric tunability of the sol-gel-prepared Pb(Sc1/2Nb1/2)0.9(Mg1/3Nb2/3)0.1O3 (PSNMN) thin film can be almost doubled from ~47% to ~80.0% (at 10 kHz) at a low electric field (~530 kV/cm), and the dielectric loss can be sharply reduced by more than an order of magnitude, from ~0.50 to ~0.037 (at 1 kHz) when the thin film was annealed in air at 650°C for 15 h under the help of an atmosphere-compensating-block (ACB) made from the proto-PSNMN gel. Moreover, the PSNMN thin film annealed with ACB also exhibited an extremely high thermally-stable dielectric tunability in an ultrabroad temperature range (>130 K), which could be attributed to the Maxwell-Wagner (MW) effect generated by the interface between the PSNMN disordered matrix and the B-site nanoscale-ordered structure formed during the long-term annealing process. The reduced dielectric loss is mainly benefited from the reduced concentration of oxygen vacancy and the possible MW effects, and the enhanced dielectric tunability could be ascribed to the weaker domain-pinning effect by oxygen vacancy. The breakthrough provides a new universal strategy to achieve utrahigh tunable performance in A(B’1/2B”1/2)O3 ferroelectric thin films with a B-site nanoscale-ordered structure, meanwhile it paves the way for ultraintergrated tunable thin-film-devices with great phase shifter performance in practical applications.

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Section: T(k) 2 0 H W I T H a C B 1 5 H W I T H A C B 1 0 H W I T H A...supporting

confidence: 68%

B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

Peng

Wang

et al. 2022

Research

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“…(a and b) Crystal structure of a perovskite. Adapted from [39], copyright Springer Nature, 2019. Table 1.…”

Section: Synthesis Techniques Deployed In Preparation Of Titanate-bas...mentioning

confidence: 99%

Role of Surface Defects and Optical Band-gap Energy on Photocatalytic Activities of Titanate-based Perovskite Nanomaterial

Okeke¹,

Aondona²,

Ogu³

et al. 2022

Recent Advances in Multifunctional Perovskite Materials

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In recent years, water pollution has become one of the major challenges faced by humans because of consistent rise in population and industrial activities. Water pollution due to discharge from cosmetics and pharmaceutical wastes, organic dyes, and heavy metal seen as carcinogens has the potential to disrupt hormonal processes in the body. Different approaches such as chlorination, aerobic treatment, aeration, and filtration have been deployed to treat wastewaters before being discharged into the streams, lakes, and rivers. However, more attention has been accorded to treatment approaches that involve use of nanomaterial due to non-secondary pollution, energy efficiency, and ease of operation. Titanate-based perovskite (TBP) is one of the most frequently studied nanomaterials for photocatalytic applications because of its stability and flexibility in optical band-gap modification. This chapter provided an overview of basic principles and mechanisms of a semiconductor photocatalyst, and current synthesis techniques that have been used in formulating TBP nanomaterial. The effect of reaction conditions and approaches such as doping, codoping, composites, temperature, pH, precursor type, surface area, and morphology on surface defects and optical band-gap energy of TBP nanomaterial was highlighted. Importantly, the impact of surface defects and optical band-gap energy of TBP on its photocatalytic activities was discussed. Finally, how to enhance the degradation efficiency of TBP was proposed.

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“…A necessary step used in many areas of modern advanced technology is the deposition of thin films of electroceramic materials on various substrates [13,14]. Attempts of BST thinfilm growth on single-crystal silicon substrates, platinum-coated silicon, Pt/Ti/SiO 2 /Si substrates, or perovskite-structure substrates have already been performed [15,16]. However, due to their brittleness, silicon and glass substrates do not meet the strength requirements for materials used in electromechanical devices such as actuators or energy harvesting devices, and can cause failures.…”

Section: Introductionmentioning

confidence: 99%

Study of the Layer-Type BST Thin Film with X-ray Diffraction and X-ray Photoelectron Spectroscopy

Lisińska-Czekaj

Czekaj

2022

Materials

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In the present paper, results of X-ray photoelectron studies of electroceramic thin films of barium strontium titanate, Ba1−xSrxTiO3 (BST), composition deposited on stainless-steel substrates are presented. The thin films were prepared by the sol-gel method. A spin-coating deposition of BST layers with different chemical compositions was utilized so the layer-type structure of (0-2) connectivity was formed. After the deposition, the thin-film samples were heated in air atmosphere at temperature T = 700 °C for 1 h. The surfaces of BST thin films subjected to thermal treatment were studied by X-ray diffraction. X-ray diffraction measurements confirmed the perovskite-type phase for all grown thin-film samples. The oxidation states of the elements were examined by the X-ray photoelectron spectroscopy method. X-ray photoelectron spectroscopy survey spectra as well as high-resolution spectra (photo-peaks) of the main metallic elements, such as Ti, Ba, and Sr, were compared for the layer-type structures, differing in the deposition sequence of the barium strontium titanate layers constituting the BST thin film.

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Enhanced dielectric properties of barium strontium titanate thin films by doping modification

Cited by 35 publications

References 108 publications

B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

Role of Surface Defects and Optical Band-gap Energy on Photocatalytic Activities of Titanate-based Perovskite Nanomaterial

Study of the Layer-Type BST Thin Film with X-ray Diffraction and X-ray Photoelectron Spectroscopy

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