D12

CA1 300 C, 2h CA2 1450 C, 3h CA3 110 C, 50h CA4 1450 C, Omin CA5 1450 C, 30min CA6 1450 C, 1 h DY drying at 75 C, 12h. bN impurity phase or incomplete cubic structure C 100 cubic crystal structure. XRD, X-ray diffraction. CA1 300 C, 2h CA2 1450 C, 3h CA3 110 C, 50h CA4 1450 C, Omin CA5 1450 C, 30min CA6 1450 C, 1 h DY drying at 75 C, 12h. bN impurity phase or incomplete cubic structure C 100 cubic crystal structure. XRD, X-ray diffraction. tallites to agglomerate and form much larger particles...

Lga15

All samples were calcined at 600 C for 3 h in air. concentration of boehmite increased at the entrance of the pores, and gelation of the sol occurred. Owing to the capillary forces, water might be sucked into the pores of the support. After a certain period (on the order of seconds), the support was removed and the gel layer was dried and calcined. The dip-coated boehmite was converted into Y-AI2O3 by calcination. After dip coating, all the samples were calcined from ambient temperature to 600...

Si ch3 nh3 Si nh2 ch4 a

Nitrogen pyrolyzed Ammonia pyrolyzed Fig. 12. Scanning electron micrographs of a wear track at (a) low and (b) high magnification, and (c) the SijNjcounterface ball after a linear wear test performed in dry nitrogen on a film cross-linked and pyrolyzed in ammonia (FILM 5), and deposited on silicon. retention of Si-N or Si-O bonds during pyrolysis is anticipated from reactions with ammonia or with latent water, respectively as follows Several films were prepared to investigate the influence of...

Experimental Procedure

Figure 1 shows the schematic representation of preparing BTO nano-particles and micropatterned BTO thin films. The BTO nano-particles were prepared by a high-concentration sol-gel method.16'17 High purity barium diethoxide (Ba(OC2H5)2, > 99 ) was dissolved in a mixed solvent of methanol (CH3OH, > 99 ) and 2-methoxyethanol (CH3OC2H4OH, EGMME, > 99.8 ) with a volume ratio of 3 2. After stirring the solution for 24 hours, titanium tetra-iso-propoxide (Ti(OiC3H7)4, > 99 ) was added in it to...

Info

HA and its composite with zirconia containing 2, 5, 7.5, and 10wt TZP were prepared by the reverse strike precipitation method. A DSC TG study revealed that addition of TZP to HA reduced the decomposition weight loss and promoted low-temperature crystallization of HA. TEM analysis of calcined powders showed spherical particles of TZP dispersed in cuboidal spher-ical HA grains. The sintered density of HA increases with 2wt TZP addition and it reduces with further addition of TZP. XRD revealed...

Synthesis and Tribological Behavior of Silicon Oxycarbonitride Thin Films Derived from Poly Urea Methyl Vinyl Silazane

University of Colorado at Boulder, Department of Mechanical Engineering, Boulder, Colorado 80309 Tsali J. Cross, Somuri V. Prasad, and David R. Tallant Sandia National Laboratories* Materials and Process Sciences Center, Albuquerque, New Mexico 87185 A process for deposition of silicon oxycarbonitride films from poly(urea)methyl vinyl silazane (PUMVS) by spin coating precursor solutions onto a substrate, followed by polymerization, cross-linking and pyrolysis has been developed. The...

Co

Fourier transform infrared spectroscopy spectrum of barium titanate nanoparticles solvothermally synthesized in a mixture of ethyl-enediamine and ethanolamine. BaTiO nanoparticles with a narrow size distribution. Among many physical and chemical properties, the dielectric constant and viscosity of solvents play a significantly important role in the size-control growth. On the one hand, in a solvent with low dielectric constant ions, saturation easily occurs and small crystallites may be...

Results And Disscussions

Figure. 1 shows XRD patterns of the products prepared by CRN and GRN methods using the same zeolite at 1400 C for 120 min. P-SiAlON was a main phase in both samples, but XRD pattern of the P-SiAlONs phase obtained by CRN method indicated the broad and splited peak in higher diffraction angle. This fact indicates the formation of (3-SiAlONs with different compositions. On the other hand, high-purity P-SiAlON with an uniform composition was confirmed in the sample produced by GRN (Fig. 1(b)). XRD...

Hydrothermal Synthesis and Densification

Xrd Analysis Inset

Yu-Dong Hou,f Lei Hou, Ting-Ting Zhang, Man-Kang Zhu, Hao Wang, and Hui Yan Department of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China The sol-gel-hydrothermal processing of Nao.8Ko.2 o.5Bio.sTi03 NKBT nanowires as well as their densification behavior were investigated. The morphology and structure analyses indicated that the sol-gel-hydrothermal route led to the formation of phase-pure perovskite NKBT nanowires with diameters of 5080 nm and lengths...

Experimental Methods

Flowchart Solution Synthesis Methods

The starting materials used in the synthesis were metal nitrates Sm N03 3.6H20 99.9 purity , La N03 3.6H20 99.9 purity , Sr N03 2 98 purity , Co N03 2.6H20 97.7 purity and glycine NH2CH2COOH, 99.5 purity , all from Alfa Aesar. A flow chart showing the various steps involved in the synthesis of powders by the solution-combustion process is shown in Fig. 1. Metal nitrates are employed both as metal precursors and oxidizing agents. Stoichiometric amounts of the metal nitrates, to yield lOg of the...

Strontium Alumnate

Chengzhou Li, Yusuke Imai, Yoshio Adachi, Hiroshi Yamada, Keiko Nishikubo, and Chao-Nan Xuf On-Site Sensing and Diagnosis Research Laboratory, National Institute of Advanced Industrial Science and An organic aqueous solution of metal acetylacetonate precursors was subjected to spray pyrolysis in order to fabricate SrAl204 Eu SAO nanoparticles. Non-agglomerated luminescent SAO nanoparticles, having a spherical shape with a size of 10-30 nm, were achieved in a single step, while only...

Praseodymium Doped Photo Luminescent Strontium Indate Nanoparticles by Ultrasonic Spray Pyrolysis

J. Wei Department of Materials Science amp Engineering, National Taiwan University, Taiwan 106, ROC Submicrometer spherical particles of praseodymium Pr -doped strontium indate were synthesized by spray pyrolysis using ultrasonic nebulization. The morphology, crystalline structure, particle size, and size distribution were studied by X-ray diffraction, scanning, and transmission electron microscopies. The spherical agglomerates were found to be made up of very...

Contents

Freeze Casting as a Nanoparticle Material-Forming Method 3 Int. J. ofAppl. Ceram. Technol., Vol. 5, Is. 3, p. 219-227 Preparation of a Nanoscale SOFC-Grade Yttria-Stabilized Zirconia Material A Quasi-Optimization of 13 the Hydrothermal Coprecipitation Process Y-C Chang, M-C Lee, W-X Kao, and T-N Lin Int. J. ofAppl. Ceram. Technol., Vol. 5, Is. 6, p. 557-567 Synthesis of Nanosize Tin Dioxide by a Novel Liquid-Phase Process 25 Y. Zhou, N. Dasgupta, and A. Virkar J. Am. Ceram. Soc., Vol. 91, No....

Freeze Casting as a Nanoparticle Material Forming Method

Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 Nanoparticle material forming is challenging because of loose packing and agglomeration issues intrinsic to nanoparticles. Liquid processing shows great potential to overcome such hurdles. This study is focused on nanoparticle colloidal processing and freeze-casting forming. A1203 nanoparticle suspensions are examined, and microstructure evolution of A1203 nanoparticle...