Fabrication of Optical Switch Based on Nanocrystalline VO2 Thin Film with Low Phase Transition Temperature

2013 ◽  
Author(s):  
Xiqu Chen ◽  
Qiang Lv ◽  
Xinjian Yi
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Optical Switch

Order Parameter Distribution and Phase Transition Temperature for a Thin Film With Asymmetric Boundaries

2012 ◽  
Vol 437 (1) ◽  
pp. 8-15 ◽  
Author(s):  
K. R. Gabbasova ◽  
A. L. Pirozerskii ◽  
E. V. Charnaya ◽  
Cheng Tien ◽  
A. S. Bugaev
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Order Parameter ◽  
Parameter Distribution

scholarly journals Phase transition in magnetic ultra-thin films

2019 ◽  
Vol 128 (1D) ◽  
Author(s):  
Phạm Hương Thảo ◽  
Ngô Thị Thuận ◽  
Phan Thị Hàn Ny
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Integral Method ◽  
Functional Integral ◽  
Spin Fluctuations ◽  
Surface Anisotropy ◽  
Functional Integral Method

<p>In this paper, we study influence of surface anisotropy on the phase transition in antiferromagnetic and ferromagnetic ultra-thin films by using functional integral method. Besides, spin fluctuations are also given to illustrate for these phase transitions. We find that the phase transition temperature of the ultra-thin films may be higher or lower than the phase transition temperature of the corresponding bulk systems, which depends on the surface anisotropy. Moreover, we also determine crossover points at which the phase transition temperature is not influenced by the thickness of the thin film.</p>

High-Temperature Optical Properties of Thin-Film Vanadium Oxides – VO2 and V2O3

1997 ◽  
Vol 479 ◽  
Author(s):  
Michael S. Thomas ◽  
Jeff F. DeNatale ◽  
Patrick J. Hood
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Optical Properties ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Spectral Region ◽  
Vanadium Sesquioxide ◽  
Infrared Spectral ◽  
Thermochromic Properties ◽  
Optical Applications

AbstractThin-film vanadium dioxide (VO2) and vanadium sesquioxide (V2O3) undergo shear phase transformations at 340K and 120K, respectively. The electrical and infrared optical properties of these materials are dramatically impacted by this phase transformation. Below the phase transition temperature, both VO2 and V2O3 are “poor” electrical insulators and have minimal absorption in the infrared spectral region. Above the phase transition temperature, both VO2 and V2O3 are poor conductors and are opaque in the infrared. The infrared thermochromic properties of these materials make them interesting candidates for several optical applications.Utilization of either VO2 or V2O3 necessitates an accurate knowledge of the optical properties both above and below the phase transition temperature. This paper reports on some recent infrared ellipsometric measurements on the optical properties of these materials above the transition temperature. These measurements found that both are strongly dispersive through the 3–12 micron spectral region. In addition, the temperature dependence of the optical properties of VO2 above the transition temperature can be related to the film morphology and stoichiometry.

Characterization of polycrystalline VO2 thin film with low phase transition temperature fabricated by high power impulse magnetron sputtering

2016 ◽  
Vol 09 (02) ◽  
pp. 1650033 ◽  
Author(s):  
Tiegui Lin ◽  
Langping Wang ◽  
Xiaofeng Wang ◽  
Yufen Zhang
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Transition Temperature ◽  
Magnetron Sputtering ◽  
Phase Transition Temperature ◽  
High Power ◽  
Photoelectron Spectroscopy ◽  
Lattice Distortion ◽  
Smart Windows ◽  
X Ray

VO2 is a unique material that undergoes a reversible phase transformation around 68[Formula: see text]C. Currently, applications of VO2 on smart windows are limited by its high transition temperature. In order to reduce the temperature, VO2 thin film was fabricated on quartz glass substrate by high power impulse magnetron sputtering with a modulated pulsed power. The phase transition temperature has been reduced to as low as 32[Formula: see text]C. In addition, the VO2 film possesses a typical metal–insulator transition. X-ray diffraction and selected area electron diffraction patterns reveal that an obvious lattice distortion has been formed in the as-deposited polycrystalline VO2 thin film. X-ray photoelectron spectroscopy proves that oxygen vacancies have been formed in the as-deposited thin film, which will induce a lattice distortion in the VO2 thin film.

Vanadium dioxide thin film with low phase transition temperature deposited on borosilicate glass substrate

2011 ◽  
Vol 519 (13) ◽  
pp. 4246-4248 ◽  
Author(s):  
Zhangli Huang ◽  
Sihai Chen ◽  
Boqing Wang ◽  
Ying Huang ◽  
Nengfu Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Borosilicate Glass ◽  
Vanadium Dioxide ◽  
Glass Substrate

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

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