Quasi-amorphous films are the only known inorganic, non-crystalline, polar materials. The conditions under which they are formed and the origin of their polarity set these materials apart from other classes of inorganic materials. The unique feature of the quasi-amorphous phase is that its ...
Quasi-amorphous colloidal structures exhibiting angle-independent tunable photonic colors in response to the electric stimuli. Moderately polydisperse colloidal Fe3O4@SiO2 nanoparticles dispersed in organic solvents exclusively form quasi-amorphous photonic materials at sufficiently high concentrations, and which...
Among the most attractive features exhibited by natural quasi-amorphous structures (QASs) are the brilliant noniridescent structural colors that are consistent with people’s visual perception, thus holding enormous potential in color-related fields. Recently, considerable effort has been devoted to mimic...
Recent publications about quasi-amorphous BaTiO3 materials have demonstrated that non-crystalline ionic solids can exhibit pyro- and piezo- electricity. This posed a question whether the quasi-amorphous state is unique to BaTiO3 or other compounds can form non-crystalline polar phases. We report that...
Transformation of the amorphous thin films into the quasi-amorphous phase occurs during pulling through a steep temperature gradient. During this process, the volume increase is inhomogeneous and causes both highly anisotropic strain and a strain gradient. The strain gradient favors breaking those ...
Capsules exhibiting blue, green and red colors are successfully fabricated using quasi-amorphous photonic solution consisting of silica nanoparticles with diameter of d=152±9.3, 180±9.0 and 225±14.9 nm respectively. The shell thickness of fabricated photonic capsules is controlled from 8.8 to 22.1 ...
microscopy of surfaces, interfaces, and thin filmsUntil now, the quasiamorphous (QA) phase in BaTiO_3 (BTO), SrTiO_3 (STO), and BaZrO_3 was achieved by pulling a thick film through a steep temperature gradient. Here, we show that a room-temperature deposited ultrathin film, subsequently...
Metallic materials with micron grains, submicron grains, or amorphous structures have attracted great interest in recent decades owing to their excellent mechanical properties and corrosion resistance. Compared with traditional forming processes, rapid solidification technology has shown great superiori...
Gey, Photo-stimulated proton-coupled electron transfer in quasi-amorphous WO3 and MoO3 thin films, Phil. Mag. 87 (2007) 4519-4553.A. Gavrilyuk, U. Tritthart, and W. Gey, Phil. Mag. 87 , 4519 (2007). ADSA. Gavrilyuk, U. Tritthart, and W. Gey, Phil. Mag. 87 , 4519 (2007)...
The transition from quasi-amorphous to nanocrystalline state of Ag film is studied on plasmonically active ultra-thin silver films. The vital mechanisms for thin film formation known as coalescence and Ostwald ripening have been discussed. Surface plasmon resonance (SPR) is robust in the region of ...