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Optimizing VO_(2)film properties for use in SAW devices

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Journal of Advanced Dielectrics 2021年第5期11卷 44-47页

作者： M.E.Kutepov g.ya.karapetyan I.V.Lisnevskaya K.g.Abdulvakhidov A.A.Kozmin E.M.Kaidashev Laboratory of Nanomaterials Southern Federal University Stachki200/1344090 Rostov-on-DonRussia Department of Chemistry Southern Federal University Zorge7344090Rostov-on-DonRussia Smart Materials Research Institute Southern Federal University Sladkova178/24344090Rostov-on-DonRussia

The aim of this study is to optimize the conditions for producing thin VO_(2)films for their use in SAW *** used the pulsed laser deposition(PLD)method to produce VO_(2)*** used a metallic vanadium *** dependence of the oxygen pressure during PLD on the resistive metal-insulator transition(MIT)on substrates of c-sapphire and LiNbO_(3)YX/128°was *** resulting films had sharp metal-insulator temperature transitions on c-Al_(2)O_(3).The most high-quality films showed resistance change by four orders of *** the lower point of the hysteresis,the resistance of these samples was in the range of 50-100Ω.The synthesized VO_(2)films had a sharp temperature transition and a relatively small width of thermal *** SAW damping during its passage through a VO_(2)/ZnO/LiNbO_(3)YX/128°film at the metal-insulator phase transition temperature was *** SAW decreases with increasing temperature from 52 dB/cm to 0 dB/cm.

关键词： Surface acoustic wave VO_(2)film laser pulsed deposition parameter S21 metal-insulator transition

Embedding epitaxial VO_(2)film with quality metal-insulator transition to SAW devices

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Journal of Advanced Dielectrics 2022年第5期12卷 53-59页

作者： M.E.Kutepov §,g.ya.karapetyan T.A.Minasyan V.E.Kaydashev I.V.Lisnevskaya K.g.Abdulvakhidov A.A.Kozmin E.M.Kaidashev Laboratory of Nanomaterials Southern Federal University200/1 Stachki Ave.344090 Rostov-on-DonRussia Department of Chemistry Southern Federal University7 Zorge St.344090 Rostov-on-DonRussia Smart Materials Research Institute Southern Federal University178/24 Sladkova St.344090 Rostov-on-DonRussia

Epitaxial VO_(2)films grown by pulsed laser deposition(PLD)method with superior phase transition related switching characteristics are successfully embedded to SAW devices using concept of the“impedance loaded SAW sensor”.A resistance of VO2 sensor abruptly drops from 0.7 MΩto 90Ωwhen it is heated above~65℃and shows a narrow hysteresis loops when *** designs of SAW devices are examined in which RF signal is reflected back from interdigital transducer(IDT)or a surface acoustic waves(SAW)is transferred through a coupler and the RF response is altered 2 and 3 times correspondingly upon the phase transition in *** the proposed devices with external load,a SAW does not propagate via VO2 film and therefore is not attenuated which is beneficiary for wireless ***,a SAW phase shift as great as 50°is induced to the SAW transferred through the coupler due to the phase transition in *** proposed approach may boost the development of remotely controlled autonomous sensors,including those based on VO2 metamaterials and hybrid plasmonic structures for near IR/middle IR and sub-THz/THz applications.

关键词： Surface acoustic wave SAW pulsed laser deposition PLD VO_(2) epitaxial film.

Tunable high-Q SAW resonator loaded on a changing capacitance

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Journal of Advanced Dielectrics 2020年第1期10卷 55-60页

作者： g.ya.karapetyan V.E.Kaydashev M.E.Kutepov T.A.Minasyan V.A.Kalinin V.O.Kislitsyn E.M.Kaidashev Laboratory of Nanomaterials Southern Federal University Stachki 200/1344090 Rostov-on-DonRussia Moscow Institute of Physics and Technology 9 Institutskiy per. 141701 DolgoprudnyRussia LLC STC“RUS” 199178Saint-Petersburg Maly av.V.I.54built 5

A tunable high-Q surface acoustic wave(SAW)resonator in the form of several parallel-connected interdigital transducers loaded on a varying capacitance on lithium niobate substrates was developed and *** working frequency range was 90-2450 MHz.A method of calculating such resonators,considering losses in the metal film as well as losses due to the propagation of SAWs and transformations into bulk waves is *** a design allows one to obtain a quality factor over 5000 in the frequency range 2400-2483 *** resonant frequency shifts by 600 kHz when the capacitance changes by±25%of the value of 21 pF(or 32 ppm/pF)and has an almost linear character.

关键词： Crystal growth directional crystallization defects internal stresses analytical methods

Creation and research of the SAW transducer with a single-phase grid and a piezoelectric zinc oxide film

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Journal of Advanced Dielectrics 2022年第5期12卷 48-52页

作者： g.ya.karapetyan M.E.Kutepov E.M.Kaidashev A.L.Nikolaev Laboratory of Nanomaterials Southern Federal University 200/1 Stachki Avenue344090 Rostov-on-DonRussia

A method for obtaining a new type of surface acoustic wave(SAW)transducer operating at double frequency with a single-phase closed-loop lattice and a piezoelectric zinc oxide film is developed and experimentally investigated.A method for calculating such a transducer has been developed,its equivalent circuit has been compiled,taking into account propagation losses,losses in the metal film and the inductance of the connecting *** the frequency is doubled,the SAW attenuation per unit length increases.

关键词： Surface acoustic wave(SAW) interdigital transducer(IDT) zinc oxide(ZnO)film.

Non-dimensional analysis on blast wave propagation in foam concrete:Minimum thickness to avoid stress enhancement

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Defence Technology（防务技术） 2024年第6期36卷 30-46页

作者： ya yang Xiangzhen Kong Qin Fang State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007JiangsuChina

Foam concrete is a prospective material in defense engineering to protect structures due to its high energy absorption capability resulted from the long plateau ***,stress enhancement rather than stress mitigation may happen when foam concrete is used as sacrificial claddings placed in the path of an incoming blast *** investigate this interesting phenomenon,a one-dimensional difference model for blast wave propagation in foam concrete is firstly proposed and numerically solved by improving the second-order godunov *** difference model and numerical algorithm are validated against experimental results including both the stress mitigation and the stress *** difference model is then used to numerically analyze the blast wave propagation and deformation of material in which the effects of blast loads,stress-strain relation and length of foam concrete are *** particular,the concept of minimum thickness of foam concrete to avoid stress enhancement is ***,non-dimensional analysis on the minimum thickness is conducted and an empirical formula is proposed by curve-fitting the numerical data,which can provide a reference for the application of foam concrete in defense engineering.

关键词： Foam concrete Blast wave propagation Non-dimensional analysis Stress enhancement

High-temperature wetting behavior between slag and refractory

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Journal of Iron and Steel Research International 2024年第6期31卷 1304-1319页

作者： Yong-xin Wang ya-ge Li ya-bo gao Zhong Huang Hai-jun Zhang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

Slag corrosion is one of the main factors of the damage of refractory,and its primary manifestations involve the melting of refractory in slag and the slag penetration into refractory,both of which are highly related to the wetting behavior between slag and *** high-temperature wettability could be characterized by parameters including the surface tension,adhesion work,and spreading coefficient of the slag on refractory surface,and it could be suppressed by altering the slag/refractory interface,thus resulting in an improved anti-corrosion *** this,the key knowledges of the slag corrosion,theory of wetting behavior and test of high-temperature contact angle were firstly ***,the major factors influencing the high-temperature slag wetting behavior were discussed based on the aspects of slag composition,refractory composition,and surface ***,the future research direction was proposed in this field.

关键词： High-temperature wetting Refractory Slag corrosion Surface tension

Fabricating functionally graded Fe-Cr-Co permanent magnetic alloys via laser powder bed fusion

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Journal of Iron and Steel Research International 2024年第3期31卷 729-737页

作者： ya-zhou He ya-qing Hou Peng Shen Hao Zhang Dong Zhou Hang Su Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China Material Digital R&D Center China Iron and Steel Research Institute Group Co.Ltd.Beijing 100081China

Laser powder bed fusion(LPBF)in-situ alloying technology offers the possibility to construct gradient materials with varied structures and *** graded Fe-Cr-Co permanent magnetic alloys were fabricated by LPBF and in-situ alloying mixed powders of Fe,Cr,and Co *** effects of different Fe,Cr and Co contents on the microstructure,magnetic properties and hardness of Fe-Cr-Co alloys prepared by LPBF were *** as-built Fe-Cr-Co alloys present a single body-centered-cubic phase and have a homogeneous distribution of *** mechanical properties and magnetic properties of the compositionally graded sample show a gradient *** the increase in Cr content,the Vickers hardness of the sample increases,and the saturation magnetization of the sample *** optimal magnetic properties in an isotropic state are given as coercivity HcB=21.65 kA/m,remanence Br=0.70 T and energy product(BH)_(max)=5.35 kJ/m^(3),which are comparable to or higher than the reported magnetic properties in an isotropic state prepared by traditional powder *** in-situ alloying technology has the potential to further explore Fe-Cr-Co magnetic materials,such as those consisting of multiple or more constituent elements,and to maximize the compositional flexibility of magnetic materials.

关键词： Fe-Cr-Co alloy Laser powder bed fusion In-situ alloying Functional material Magnetic property

Anti-corrosive and highly reversible zinc metal anode enabled by the phenolic resin coating

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Rare Metals 2024年第5期43卷 2115-2124页

作者： ya-Ping Wang ya-Di yang Shu-Qi Duan Li Wang Jia-Shuo guo An-Qiang Pan School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Key Laboratory of Special Functional Materials for Ecological Environment and Information(Hebei University of Technology).Ministry of Education Tianjin 300130China Key Laboratory for New Type of Functional Materials in Hebei Province Hebei University of TechnologyTianjin 300130China School of Materials Science and Engineering Central South UniversityChangsha 410083China

Aqueous zinc-ion batteries have attracted much attention due to their high theoretical capacity,low cost high safety,and ***,challenges such as dendrite growth and side reactions severely hinder the electrochemical performance of the Zn anode,leading to low Coulombic efficiency(CE)or even short circuits Herein,phenolic resin(PF)is used as a protective coating on the surface of the zinc metal *** PF layer can greatly improve the corrosion resistance of the Zn electrode in the ***,this artificial electrode/electrolyte interphase also elevates the nucleation barrier and restrains Zn^(2+)2D diffusion,regulating the zinc deposition/dissolution *** a result,PF@Zn symmetric cells exhibit superior performance than that of bare Zn symmetric cells,achieving a stable and dendrite-free cycle of 1400 ***,the carbon nanotube MnO_(2)||PF@Zn(CNT/MnO_(2)||PF@Zn)full cell also delivers a long cycle life with a high-capacity retention of about 180.0 m Ah·g^(-1)after 1400 cycles,far exceeding that of bare Zn *** work provides a facile strategy for achieving a dendrite-free and rechargeable zinc anode.

关键词： Rechargeable aqueous batteries Zn metal anode Phenolic resin Anti-corrosion

One more step to realistic CO_(2) reduction reactions——geometric structures evolutions at gas-solid interface

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Rare Metals 2024年第2期43卷 849-852页

作者： ya-Qiang Xie Xin Yu Ting Wang College of the Environment and Ecology Xiamen UniversityXiamen361102China

A rational design of copper(Cu)nanocatalyst is critical to the efficient carbon dioxide(CO_(2))conversion toward C1/C2 chemical ***,the lack of actual information on the vicinal Cu interfaces hinders the intrinsic activitystructure correlation *** with atomic-scale in situ characterizations(AP-STM and synchrotron-based AP-XPS),Park and co-workers study and identify the adsorbate-driven morphological evolution of Cu nanoclusters on the Cu(997)surface,providing real-space evidence for the critical role of vicinal structures on Cu *** observed surface roughening trends caused by dissociated atomic oxygen and CO adsorbates subsequently affect the result of successive catalytic reactions to produce critical intermediates,such as carbonate and formate,during the CO_(2)reduction reaction.

关键词： reaction critical rational