The aim of this study is to optimize the conditions for producing thin VO_(2)films for their use in SAW devices.We used the pulsed laser deposition(PLD)method to produce VO_(2)films.We used a metallic vanadium target....The aim of this study is to optimize the conditions for producing thin VO_(2)films for their use in SAW devices.We used the pulsed laser deposition(PLD)method to produce VO_(2)films.We used a metallic vanadium target.The 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 studied.The 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 magnitude.At 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 hysteresis.The SAW damping during its passage through a VO_(2)/ZnO/LiNbO_(3)YX/128°film at the metal-insulator phase transition temperature was studied.Attenuation SAW decreases with increasing temperature from 52 dB/cm to 0 dB/cm.展开更多
A thermoelectric transducer based on MDSM structures of the field-effect transistor(FET)type is proposed,in which the thermal energy of the environment is converted into electrical energy.We use a new principle of con...A thermoelectric transducer based on MDSM structures of the field-effect transistor(FET)type is proposed,in which the thermal energy of the environment is converted into electrical energy.We use a new principle of converting thermal energy into electrical energy.We show that with the help of such a converter,it is possible to dramatically increase the efficiency of processors due to the heat generated by the processor is converted by this converter again into electricity that transfers to the processor.展开更多
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 studied.The worki...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 studied.The 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 proposed.Such a design allows one to obtain a quality factor over 5000 in the frequency range 2400-2483 MHz.The 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.展开更多
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 inves...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 wires.When the frequency is doubled,the SAW attenuation per unit length increases.展开更多
基金This research work is supported by Southern Federal University,project No.07/2020-06-MM.
文摘The aim of this study is to optimize the conditions for producing thin VO_(2)films for their use in SAW devices.We used the pulsed laser deposition(PLD)method to produce VO_(2)films.We used a metallic vanadium target.The 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 studied.The 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 magnitude.At 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 hysteresis.The SAW damping during its passage through a VO_(2)/ZnO/LiNbO_(3)YX/128°film at the metal-insulator phase transition temperature was studied.Attenuation SAW decreases with increasing temperature from 52 dB/cm to 0 dB/cm.
基金This study has been performed at partial financial support of the Russian Foundation for Basic Research(Grant No.19-08-00365)I.A.Parinov acknowledges financial support of the Russian Ministry of Education and Sciences into framework of the proposal No.3.5378.2017/VU(organization of the implementation of researches).
文摘A thermoelectric transducer based on MDSM structures of the field-effect transistor(FET)type is proposed,in which the thermal energy of the environment is converted into electrical energy.We use a new principle of converting thermal energy into electrical energy.We show that with the help of such a converter,it is possible to dramatically increase the efficiency of processors due to the heat generated by the processor is converted by this converter again into electricity that transfers to the processor.
基金This research work is supported by the Russian Ministry of Science and Higher Education under the project No.16.5405.2017/8.9。
文摘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 studied.The 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 proposed.Such a design allows one to obtain a quality factor over 5000 in the frequency range 2400-2483 MHz.The 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.
基金supported by Southern Federal University Research Project No.07/2020-06-MMthe 10th Anniversary International Conference on“Physics and Mechanics of New Materials and Their Applications”(PHENMA 2021-2022).
文摘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 wires.When the frequency is doubled,the SAW attenuation per unit length increases.
