1333-84-2Relevant academic research and scientific papers
Synthesis of thermally stable Cs-doped alumina nanoparticles by microemulsion method
You, Zhixiong,Balint, Ioan,Aika, Ken-Ichi
, p. 1090 - 1091 (2002)
Cs-doped alumina nanoparticles were synthesized by microemulsion method and then characterized. Cs-doping greatly improved aluminas thermal stability. For an optimum molar ratio of Cs/Al = 1/11 the structure of γ-alumina can be preserved even at temperatu
Synthesis of highly ordered mesoporous alumina thin films and their framework crystallization to γ-alumina phase
Jiang, Xiangfen,Oveisi, Hamid,Nemoto, Yoshihiro,Suzuki, Norihiro,Wu, Kevin C.-W.,Yamauchi, Yusuke
, p. 10851 - 10856 (2011)
Here we report the preparation of highly ordered mesoporous alumina films existing both as P63/mmc and Fm-3m mesostructures by using triblock copolymer Pluronic P123 as the structure-directing agent. 2D grazing-incidence small-angle X-ray scatt
Assessment of the reaction of SiC powders with iron-based alloys
Terry, B. S.,Chinyamakobvu, O. S.
, (1993)
The degree of reaction and dispersion achieved when SiC powders are brought into contact with liquid iron-based alloys has been assessed by a levitation dispersion test SiC was found to react rapidly with molten iron matrices to form iron silicides and graphite. Attempts to generate protective TiC or Al2O3 coatings on SiC in situ in liquid iron proved unsuccessful; neither was precoating SiC and Ni and/or Cu successful in providing protection against molten iron alloys. Unprotected SiC also reacted readily with iron in the solid state (1000-1200°C). Precoating with Ni, however, provides protection and prevents SiC dissolution and silicide formation during sintering at such temperatures.
Size-dependent melting behavior of Zn nanowire arrays
Wang, Xue Wei,Fei, Guang Tao,Zheng, Kang,Jin, Zhen,De Zhang, Li
, (2006)
The melting behavior of Zn nanowires embedded in the holes of porous anodic alumina membrane with different diameters was studied by using the differential scanning calorimetry. The crystalline structure and morphology of Zn nanowire arrays were character
Preparation of Cast Mo2B5 by Self-Propagating High-Temperature Synthesis Metallurgy Methods
Gorshkov,Sachkova,Khomenko, N. Yu.
, p. 1216 - 1222 (2018)
Abstract—: This paper reports the preparation of cast dimolybdenum pentaboride by a self-propagating high-temperature synthesis (SHS) metallurgy method. Experiments were carried out in SHS reactors at an initial excess gas (Ar) pressure p0 = 5
Impact of fixed charge on metal-insulator-semiconductor barrier height reduction
Hu, Jenny,Nainani, Aneesh,Sun, Yun,Saraswat, Krishna C.,Philip Wong
, (2011)
Recently, the insertion of ultrathin insulators to form metal-insulator-semiconductor (MIS) contacts has been used extensively to reduce the Schottky barrier height and to shift the Fermi level pinning. In this paper, we investigate the physical non-idealities of the ultrathin insulator in Al/Al2O3/n-GaAs MIS through stoichiometry, density, and bandgap measurements. These structural non-idealities electrically manifest as bulk and interface fixed charges that are found to contribute to the observed barrier height reduction. The effect of fixed charge has not been considered before, and when combined with the previously reported interface dipoles, it provides a more thorough understanding of the MIS contacts.
Alkali corrosion resistant coatings for Si3N4 ceramics
Li,Hirschfeld,Brown
, p. 4455 - 4461 (1997)
The use of ceramic oxide coatings on silicon nitride is one method to improve its alkali corrosion resistance. Four oxide coatings, including (Ca0.6, Mg0.4) Zr4(PO4)6 (CMZP), zirconia, mullite and alu
Dynamics of Hollow and Solid Alumina Particle Formation in Spray Flames
Tani, Takao,Takatori, Kazumasa,Pratsinis, Sotiris E.
, p. 523 - 525 (2004)
Thermophoretic sampling (TS) of the aerosol was conducted to manifest the formation of hollow and solid alumina particles in spray flames. The collected particles were investigated by transmission electron microscopy. Hollow particles with a thin shell (e.g., 10 nm) were formed from the aluminum nitrate precursor emulsion at less than 4-cm flame height. Hollow particles maintained their shapes in the flame using air as dispersion/oxidant gas, whereas hollow-to-solid restructuring of the particles took place in the flame using oxygen. With oxygen, nanoparticles were formed in the gas phase from the aluminum butoxide/2-propanol precursor solution only, whereas gas-phase reaction was hindered, forming large par ticles from the aluminum nitrate/2-propanol precursor solu tion.
Structural and compositional dependence of gadolinium-aluminum oxide for the application of charge-trap-type nonvolatile memory devices
Park, Youngmin,Park, Jong Kyung,Song, Myeong Ho,Lim, Sung Kyu,Oh, Jae Sub,Joo, Moon Sig,Hong, Kwon,Cho, Byung Jin
, (2010)
The structural and compositional dependence of gadolinium-aluminum oxide (GdAlO) for application to nonvolatile memory is investigated. An addition of Gd into AlO reduces the leakage current, which improves the erase window. The GdAlO film crystallizes into many different phases after annealing depending on the Gd percentage when the amount of Gd exceeds 49%. The crystallization of the GdAlO film causes a change in the band gap of the GdAlO film, resulting in a change of the retention properties. It is also found that crystallized GdAlO is more vulnerable to the generation of traps by electrical stress. The results indicate that careful optimization of the Gd percentage in GdAlO is necessary to utilize the benefit of GdAlO with minimum deterioration in the charge retention property.
Synthesis and characterization of nano-composite alumina-titania ceramic membrane for gas separation
Ahmad,Othman,Idrus
, p. 3187 - 3193 (2006)
A ceramic composite membrane was prepared using a commercial titania ceramic membrane coated by alumina oxide via a sol-gel technique where polyvinyl alcohol (PVA) was used as a binder. The characteristic of the membrane was analyzed in terms of the effect of PVA concentration and sintering temperature on viscosity, pore size, density, porosity and surface area of the membrane. Two vol% of PVA solution containing 4 g of PVA in 100 mL of water was adequate to achieve an appropriate porosity level to avoid cracks on the gel layer. Sol viscosity and pore size of the membrane essentially increased when the PVA concentration was increased. The density of the membrane increased as the sintering temperature increased. The porosity level however, decreased when the temperature was increased. The composite membrane was further characterized in terms of permeability of pure gas at low-temperature region (301 K) where an experimental platform has been developed to perform the permeability studies.
