We present multiphoton imaging based on semiconductor planar waveguide technology which can be used as a transmitter and receiver simultaneously. In particular, silicon on insulator waveguides with p-i-n diode structures are used to demonstrate 5 m resolution three-photon imaging of Er3+ :Y2O3 microparticles by using 1550 nm excitation. Additional theoretical study has been performed to demonst...

The microstructure and physical properties of new Y2O3 and Al2O3 oxide-doped silicon nitride ceramics fabricated by cold isostatic pressing and free sintering were investigated. The phase composition of produced material was also studied by X-ray diffraction at room and elevated temperature. The fabricated ceramics featured a microstructure of Si5AlON7 grains with a fine-grained α-Si3N4 with a ...

Sub-2-nm (down to one-unit cell) uniform oxide nanocrystals and highly ordered superstructures were obtained in one step using oleylamine and oleic acid as capping and structure directing agents. The cooperative nature of the nanocrystal growth and assembly resulted in mesoscopic one-dimensional ribbon-like superstructures made of these ultrathin nanocrystals. The process reported here is gener...

Protons from hydrogen or water vapour may dissolve in oxides and other corrosion products, and may affect, and in some cases, dominate their defect structures. Defect-dependent properties like scale growth and plastic deformation then become dependent on the ambient hydrogen or water vapour pressure. Small concentrations of protons may enhance the transport of oxygen in the form of hydroxide io...

The surface potential of Y2O3 stabilized Zr02 was measured at 1035 K during the re-equilibration involving oxidation and reduction at oxygen partial pressure between 0.21 and 3.10"^atm. Changes in work function consist of a rapid initial increase due to ionic equilibration and a slow drift of the same sign. Comparison of the obtained results with former electronic emission data of Zr0£ reported...

The microstructure and phase composition of the high-content Al2O3-Y2O3-doped spark plasma-sintered silicon nitride were investigated. Fully dense silicon nitride ceramics with a typical α-Si3N4 equiaxed structure with average grain size from 200 to 530 nm, high elastic modulus of 288 GPa, and high hardness of 2038 HV were spark plasma sintered (SPSed) at 1550 °C. Silicon nitride with elongated...

The structure and thermal characteristics of aerodynamically levitated samples of yttria-alumina in the liquid, supercooled liquid and solid phases were explored in an extensive series of high energy x-ray diffraction, small angle neutron scattering, and pyrometric cooling measurements. Particular focus was placed on the compound (Y2O3)(x)(Al2O3)(1-x) with x = 0.2 for which a liquid-liquid phas...

Our ability of controlling the growth and interfaces of thin dielectric films on III–V semiconductors by ultrahigh vacuum deposition has led to investigations of gate stacks containing rare earth oxides of Gd2O3 and Y2O3 as alternative high k gate dielectrics for Si. The abrupt interfaces achieved in these gate stacks have enabled the electrical, chemical, and structural studies to elucidate th...