Showing papers in "Journal of Crystal Growth in 2004"

TL;DR: In this paper, the degradation rate of white LEDs was investigated and it was shown that the degradation process depends on both the junction temperature and the amplitude of short-wavelength radiation.

TL;DR: In this article, large-size single crystals of β-Ga 2 O 3 with 1-inc in diameter have been grown by the floating zone technique and the stable growth conditions have been determined by the examination of the crystal structure.

TL;DR: In this article, the authors used the hydrothermal method combined with a platinum inner container to grow zinc oxide (ZnO) single crystals with a large size of 50×50×15mm 3.

TL;DR: In this paper, the use of metal organic vapor-phase epitaxy (MOVPE) for growth of one-dimensional nanostructures in the material systems GaAs, GaP, InAs and InP is investigated.

TL;DR: A relatively easy method to synthesize pure, stable, stoichiometric nano crystalline hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2, HAP) at low temperature by sol-gel route is presented in this paper.

TL;DR: In this article, the authors combine Gibbs adsorption equation and McLean's grain boundary segregation model to derive an empirical relation for isothermal grain growth, which predicts that driving grain boundary energy to zero is possible in alloy with high segregation energy.

TL;DR: In this paper, different organic additives such as β-cyclodextrin (β-CD), amylose, and poly(ethylene oxide) polymer (PEO) are selected, respectively, to coat zinc acetate in order to investigate their roles on the thermal decomposition process of the precursor.

TL;DR: In this article, the authors presented a method for preparation of copper metal nanoparticles by reducing CuSO 4 ·5H 2 O with NaH 2 PO 2 ·H 2O in ethylene glycol under microwave irradiation.

TL;DR: In this article, the influence of synthesis parameters on the morphological characteristics and sizes of magnesium hydroxide nanoparticles precipitated in an aqueous medium was investigated, such as types of surfactants or water soluble polymeric dispersants, reaction temperature and concentration, addition method and rate, and hydrothermal treatment of reactants.

TL;DR: In this paper, a catalyst-free approach for the growth of semiconductor nanowires was proposed, which is attracting interest as building blocks for nanoscale electronics and circuits.

TL;DR: In this article, an anisotropic eutectic phase field model was developed by extending the interface field method under a condition that coexisting phases at a given point have an equal chemical potential difference between solute atom and solvent atom.

TL;DR: Rod-shaped CuO nanostructures were successfully synthesized by a one-step annealing process in air using copper plates as starting material as mentioned in this paper, and phase analysis was carried out using X-ray diffraction, transmission electron microscopy and micro-Raman scattering and the results confirmed the nanorods as single phase CuO.

TL;DR: In this article, a detailed analysis of the thermodynamic equations has been carried out by establishing a simple model, which shows the influence of the pore structure both on the water activity and saturation degree of involved salts.

TL;DR: In this article, X-ray topography using synchrotron radiation was used to observe screw dislocation, threading edge dislocation and basal plane dislocation in 4H-SiC substrates and epitaxial layers.

TL;DR: In this article, a mold with a re-entrant channel was used for unidirectional solidification of Sn-21-mass% Bi alloys and the detachment of the fragmented dendrite arms was observed after the interface broke down and formed the dendrites.

TL;DR: In this article, the optical properties and electronic structure of molecular-beam epitaxy grown InN and Inrich group III-nitride alloy films are studied and the band gap of InN is determined to be 0.7 eV by optical absorption, photoluminescence, and photo-modulated reflectance.

TL;DR: In this paper, large-scale cupric oxide (CuO) nanowires have been synthesized by thermal evaporating copper foils in O2 ambient at the temperatures from 300°C to 900°C.

TL;DR: In this article, a solvothermal reaction was used to synthesize Mn3O4 and MnOOH nanorods with different morphologies, which are expected to show unusual properties and potential applications in catalysis, electrochromic and magnetic materials.

TL;DR: In this article, a silk fibroin was employed to regulate the mineralization of hydroxyapatite (HA) nanocrystals, which was detected by X-ray diffraction analysis to investigate the mineralisation process of calcium phosphate.

TL;DR: In this paper, the authors present their recent progress in the development of LEDs with emission between 237 and 297 nm, and discuss growth and design issues of deep-UV LEDs, including transport in Si-doped AlGaN layers.

TL;DR: In this paper, hydrogen peroxide solutions were used to oxidize metallic titanium at 353 K for 72h to prepare crystalline titania nanorods, which were verified by X-ray diffraction tests to be pure anatase or a mixture of anatase and rutile, depending mainly on the anions of F −, Cl −, and SO 4 2− in the solutions.

TL;DR: A simple hydrothermal route, using cetyltrimethylammonium bromide (CTAB) as the surfactant, has been proposed for synthesizing single-crystalline spinal cobalt ferrite (CoFe 2 O 4 ) nanorods as mentioned in this paper.

TL;DR: LuYAG [(Lu,Y) 3 Al 5 O 12 ] single crystals have been grown by means of the Czochralski method as discussed by the authors, and the solidification points of LuYAG ranged from 2010°C for Lu,Y 3 Al5 O 12 to 1930°c for Y 3 Al 6 O 12.

TL;DR: In this article, the optical, electrical and structural properties of the films depended directly on substrate temperature during deposition, and it was found that doping with Al had the effect of broadening the optical band gap, with both cases being attributed to the Burstein-Moss shift.

TL;DR: In this paper, an easy and economic method is proposed to synthesize zinc sulfide (ZnS) nanocrystals by solid-state reaction of zinc acetate and thioacetamide at low temperature.

TL;DR: In this paper, the optical properties of ZnO bulk grown by hydrothermal method were investigated on the Znterminated surface by using Raman scattering and photoluminescence (PL).

TL;DR: In this article, thin PVA/zirconium oxychloride composite fibres were prepared by using sol-gel processing and electrospinning technique after calcinations of the above precursor fibres, ZrO 2 nanofibres with a diameter of 50-200nm could be successfully obtained.

TL;DR: In this article, the authors showed that GaN crystal can be grown by ammonothermal method using NH 4 Cl mineralizer using inner wall of autoclave is covered with Pt so as to prevent possible contamination from auto-clave.

TL;DR: In this article, a micro-pulling-down (μ-PD) growth apparatus was modified for fluoride crystals, which allowed to produce single crystalline material in a faster thus more economic way.

TL;DR: In this article, a new process named heating-sol-gel template process for fabrication oxide nanorods with large quantity, good compositional uniformity and fine crystallinity based on a template method was proposed and the above characterization results support the new process is a desirable process.