Strontium aluminate, SrAl2O4 is well-known phosphor host material with spinel structure. Mg substituted compositions, MgxSr1-xAl2O4: Eu, Nd (with x= 0.05 0.25) were prepared by solid-state reaction method. Effect of Mg substitution on structure and photoluminescence was investigated. Prepared compositions were characterized for the phase and crystallinity by powder X-ray diffraction. The micro-...

Nanosized strontium aluminate phosphors co-activated by Eu2+ and Dy3+ were prepared via a novel reverse microemulsion process. This new ynthesis technique lowered the synthesis temperature of SrAl2O4: Eu2+, Dy3+ phosphors to as low as 900 ◦C, and also reduced the particle size o the nanometer scale (around 40 nm). In the microemulsion process, the constituent cations were trapped by numerous na...

Alkali-free, aluminium-based accelerators are often used for shotcrete linings in tunnels and mines, where external sulfate attack can occur. Therefore, it is essential to know, if the influence of on cement hydrate assemblage negatively impacts resistance. This study focuses effect hydration consequences attack. Aluminum sulfate-based cause rapid setting due very early formation ettringite acc...

The effect of triethanolamine (TEA) at various dosages on the early performance cement paste was systematically evaluated through techniques rheological measurements, penetration tests, and ultrasonic pulse velocity. correlation to chemical hydration process analyzed by calorimetry, zeta potential, in situ XRD, pore solution analysis. It is found that TEA strongly dependent its dosage. With dos...

Single-phase cerium aluminate was synthesized from mixtures of ceria and metallic aluminum by milling firing under controlled conditions in reducing (10%H2 + 90%N2) or inert atmospheres (N2 CO2). Firing an atmosphere (CO2) did not yield conversion to aluminate, also low after only improved slightly on changing powder with coarse Al (15 µm) submicron (0.77 µm). High-energy promoted reactivity th...

Electronic confinement at nanoscale dimensions remains a central means of science and technology. We demonstrate nanoscale lateral confinement of a quasi-two-dimensional electron gas at a lanthanum aluminate-strontium titanate interface. Control of this confinement using an atomic force microscope lithography technique enabled us to create tunnel junctions and field-effect transistors with char...

Superconducting films of (Tl0.5Pb0.5)(Sr0.95Ba0.05)2(Ca0.8Gd0.2)Cu2Oz 1212, approximately 3 μm in thickness, were fabricated on single-crystalline lanthanum aluminate. The films were practically phase pure and showed excellent in-plane and out-of-plane texture. Critical temperatures of up to 96 K were recorded. Critical current densities of the order of 40 MA m−2 at 77 K in self-field were meas...

Lanthanum-aluminate (LaA103) is one of the optimum substrates for epitaxic growth of thin oxide films. In this paper, the structures of the {100} and {110} surfaces of annealed LaA103 are studied using reflection electron microscopy (REM). (010) steps have been observed on {100}, these are the lowest energy steps. The {100} surface is atomically flat, but the {110} surfaces exhibit high-density...