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Escobar A, L.; Haro P, E.; Camacho L, M.A.; Fernandez G, M.; Jimenez J, J.; Sanchez P, A.
Academia Mexicana de Ciencia de Materiales A.C. (Mexico)1998
Academia Mexicana de Ciencia de Materiales A.C. (Mexico)1998
AbstractAbstract
[en] The thin films of TiO2 have been investigated extensively in the last years, since they have a broad variety of applications, which owing to their less usual chemical, electrical and optical properties. In this work are presented the obtained results to deposit TiO2 thin films over glass substrates utilizing the Laser ablation technique. It has been deposited thin films at different substrate temperatures and different oxygen pressures, with the purpose to study the influence of these deposit parameters in the structural characteristics of the obtained films. The structural characterization was realized through Raman spectroscopy and X-ray diffraction (XRD), the superficial morphology was verified by Scanning Electron Microscopy (SEM). The results show that the obtained films were TiO2 in rutile phase, getting this with the substrates at low temperature, its morphology shows a soft surface with some sprinkling particles and a good adherence. (Author)
Original Title
Obtencion de peliculas delgadas de TiO2 por ablacion laser
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1998; 1 p; International Materials Research Congress; Cancun, Quintana Roo (Mexico); 3. NACE Latin American Region Corrosion Congress; 3. NACE Congreso Latinoamericano de Corrosion y el 6. Congreso Iberoamericano de Corrosion y Proteccion; Cancun (Mexico); 31 Aug - 3 Sep 1998; 6. Iberoamerican Congress of Corrosion and Protection; 3. NACE Congreso Latinoamericano de Corrosion y el 6. Congreso Iberoamericano de Corrosion y Proteccion; Cancun (Mexico); 31 Aug - 3 Sep 1998
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Misheva, M.A.; Djourelov, N.; Margaca, M.A.; Salvado, F.I.; Passage, G.
Characterization of ceramics and semiconductors using nuclear techniques. Final report of a co-ordinated research project1999
Characterization of ceramics and semiconductors using nuclear techniques. Final report of a co-ordinated research project1999
AbstractAbstract
[en] Positron annihilation spectroscopy has been used to get information about the small pore structure of the system xTiO2.(1-x)SiO2 (x=10,30 mol.%). The pore radius and volume probability distribution functions have been received from the ortho-Positronium lifetime probability distribution function, obtained by the lifetime spectra processing with CONTIN (PALS-2) program. The linearity of the S versus W-parameters has been used to check the similarity (or not) of the defect structure of the samples prepared under different experimental conditions. (author)
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International Atomic Energy Agency, Vienna (Austria); 245 p; ISSN 1011-4289;
; Mar 1999; p. 153-160; 17 refs, 4 figs, 2 tabs

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O'Connor, B.H.; Van Riessen, A.; Li, D.Y.
AINSE's 40th anniversary conference. Conference handbook1998
AINSE's 40th anniversary conference. Conference handbook1998
AbstractAbstract
[en] Full text: The Materials Research Group at Curtin University has made extensive use of the Lucas Heights neutron powder diffraction facilities over the last decade. The paper will summarise the following neutron diffraction experiments all of which involved high-temperature, real-time measurements with the MRPD diffractometer: 1) Microstructure development in zirconia-dispersed aluminas (van Riessen, 1997) in which phase composition changes and residual strain development were examined as the material cooled to room temperature following sintering. 2) Calcination of gibbsite to α-alumina (Gan, 1996). A highlight of this study was the observation of co-existing tetragonal and cubic polymorphs of γ-alumina. 3) Study of the liquid-phase-sintering of an alumina-matrix ceramic composition (Latella, 1995; Latella et al, 1998). Here the influence of the post-sintering cooling rate on phase composition was examined with particular reference to wear-resistant behaviour
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Australian Institute of Nuclear Science and Engineering, Lucas Heights, NSW (Australia); 89 p; 1998; p. 45; AINSE's 40th anniversary conference; Lucas Heights, NSW (Australia); 2-3 Dec 1998; 4 refs.
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Hunter, B.A.; Howard, C.J.; Kennedy, B.J.
AINSE's 40th anniversary conference. Conference handbook1998
AINSE's 40th anniversary conference. Conference handbook1998
AbstractAbstract
[en] Full text: Oxide materials form a large group of technologically and scientifically important materials, and research on these types of materials is on the forefront of scientific research. The important properties of these materials, such as the electronic, magnetic and mechanical properties, are related to the structure and chemical composition of those materials. As the structure is so important in the understanding of the properties, neutron scattering is playing a key role due to its advantages in characterising the role of the oxygen. We present here some examples of the latest oxide structures studied by neutron powder diffraction at ANSTO
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Australian Institute of Nuclear Science and Engineering, Lucas Heights, NSW (Australia); 89 p; 1998; p. 64; AINSE's 40th anniversary conference; Lucas Heights, NSW (Australia); 2-3 Dec 1998
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AbstractAbstract
[en] Full text: The necessity of integration of magnetics with silicon processing technology became essential with the advent of Micro Electromechanical Systems (MEMS). The need to control the crystalline and magnetic properties of the magnetic thin films on silicon substrates has been the primary motivation for this work. The major objective of this work is to prepare the stoichiometric and crystalline SmCo5 thin films with good magnetic properties on single crystal silicon substrate. We have prepared the SmCo think films on single crystal (100) silicon substrates using DC magnetron sputtering. Films have been prepared in pure argon as the sputter media at two different pressures 2 x 10-2 torr and 2 x 103 torr with the substrates kept at room temperature, 500 and 700 deg C separately. These films have been characterised using RBS, XRD and SEM. RBS analysis showed that the films are nearly stoichiometric (1:4.9) and have significant amounts of oxygen as impurity. But XRD studies indicated that the as deposited films (at all substrate temperatures) are yet to form the crystalline structure. Some of the films have been subjected to rapid thermal annealing at two different temperatures at 800 and 1000 deg C for 30 secs in an effort to crystallise the films. RBS analysis of these films indicated that the room temperature and post annealed films at 1000 deg C resulted in considerable interdiffusion characteristics, whereas the high temperature deposited (500 and 700 deg C) and annealed films showed relatively very stable characteristics with minimal diffusion between the film and the substrate. XRD and SEM analysis of the films is in progress. The detailed results of these investigations will be presented
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Australian Institute of Nuclear Science and Engineering, Lucas Heights, NSW (Australia); 89 p; 1998; p. 75; AINSE's 40th anniversary conference; Lucas Heights, NSW (Australia); 2-3 Dec 1998
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Ishigaki, T.; Kitaguchi, K.; Futase, T.; Tsuchiya, Yoshinori
Progress report on neutron scattering research (April 1, 1997 - March 31, 1998)1999
Progress report on neutron scattering research (April 1, 1997 - March 31, 1998)1999
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No abstract available
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Suzuki, Jun-ichi; Fujiwara, Satoru; Aizawa, Kazuya (eds.); Japan Atomic Energy Research Inst., Tokyo (Japan); 133 p; Feb 1999; p. 52
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ALKALINE EARTH METAL COMPOUNDS, CHALCOGENIDES, CHEMICAL ANALYSIS, COHERENT SCATTERING, COMPUTER CODES, COPPER COMPOUNDS, DIFFRACTION, ELECTRIC CONDUCTIVITY, ELECTRICAL PROPERTIES, IRON COMPOUNDS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, QUANTITATIVE CHEMICAL ANALYSIS, RARE EARTH COMPOUNDS, SCATTERING, SUPERCONDUCTORS, TITRATION, TRANSITION ELEMENT COMPOUNDS, VOLUMETRIC ANALYSIS
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Osamura, K.; Miyata, S.; Suzuki, Junichi; Sasagawa, T.; Kishio, K.
Progress report on neutron scattering research (April 1, 1997 - March 31, 1998)1999
Progress report on neutron scattering research (April 1, 1997 - March 31, 1998)1999
AbstractAbstract
No abstract available
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Suzuki, Jun-ichi; Fujiwara, Satoru; Aizawa, Kazuya (eds.); Japan Atomic Energy Research Inst., Tokyo (Japan); 133 p; Feb 1999; p. 60
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COPPER OXIDES, HIGH-TC SUPERCONDUCTORS, LANTHANUM COMPOUNDS, NEUTRON BEAMS, PHASE TRANSFORMATIONS, RELAXATION, SMALL ANGLE SCATTERING, STRONTIUM COMPOUNDS, SUPERCONDUCTIVITY, TEMPERATURE DEPENDENCE, TEMPERATURE RANGE 0000-0013 K, TEMPERATURE RANGE 0013-0065 K, TEMPERATURE RANGE 0065-0273 K, TRANSITION TEMPERATURE, VORTICES, ZONE MELTING
ALKALINE EARTH METAL COMPOUNDS, BEAMS, CHALCOGENIDES, COPPER COMPOUNDS, CRYSTAL GROWTH METHODS, ELECTRIC CONDUCTIVITY, ELECTRICAL PROPERTIES, MELTING, NUCLEON BEAMS, OXIDES, OXYGEN COMPOUNDS, PARTICLE BEAMS, PHASE TRANSFORMATIONS, PHYSICAL PROPERTIES, RARE EARTH COMPOUNDS, SCATTERING, SUPERCONDUCTORS, TEMPERATURE RANGE, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENT COMPOUNDS
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AbstractAbstract
[en] Full text: Zirconolite is the key Synroc phase for the immobilisation of actinide-rich radioactive waste. The successful incorporation of actinide elements into zirconolite is critically dependent upon a knowledge of the prevailing valence state and site location for each of the elements under the selected processing atmosphere. A series of Ce- (used as a nonradioactive simulant for Pu) Pu- and Np-bearing zirconolites representing the alternative valence states (+3 or +4) and site locations (Ca or Zr site) have been prepared and sintered under a range of oxygen pressures, prior to being analysed by XRD and analytical SEM. From these techniques the valence state and site locations of the actinide elements have been inferred. X-ray absorption spectroscopy (XAS) however offers an opportunity to determine these properties directly. These results will be discussed, and preliminary conclusions drawn about the role of cerium as a nonradioactive simulant for plutonium
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Monash Univ., Clayton, VIC (Australia). Dept. of Physics; 213 p; 1996; p. 145; 20. ANZIP annual condensed matter physics meeting; Wagga Wagga, NSW (Australia); 30 Jan - 2 Feb 1996
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Govinda Rajan, K.; Yousuf, Mohammad.
Indira Gandhi Centre for Atomic Research, Kalpakkam (India)1996
Indira Gandhi Centre for Atomic Research, Kalpakkam (India)1996
AbstractAbstract
[en] An overview of the research and development activities in the area of high pressures carried out at the Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam is presented. Experimental techniques for performing x-ray diffraction, electrical resistivity, Raman scattering and positron lifetime have been developed. In particular, the electrical resistivity measurements can be carried out at low and high temperatures. One of the novel developments has been the adaptation of the diamond anvil cell (DAC) in the Guinier geometry for carrying out high pressure x-ray diffraction experiments. Use of this geometry has resulted in a data acquisition with high signal-to-noise ratio. Although all the experiments at IGCAR are based on static pressure apparatus, namely, metal, Al2O3 + TiO2 and diamond anvil cells, dynamic method using the exploding wire technique is utilised for observation of pulse of neutrons from nuclear materials under shock condition. A variation of this technique, namely, isobaric resistive pulse heating is being developed for studying the thermophysical properties. Significant progress has been made in the indigenous development of a DAC. A precision fabrication of a Mao-Bell type DAC has been carried out based on the inputs from the design considerations obtained through finite element analysis. Another noteworthy achievement is the installation of the band structure programmes based on linear methods. Typical results obtained using the high pressure techniques are highlighted to give a flavour of the research done at IGCAR. The article closes with an account of the future directions of the research and development activities at this Centre
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1996; 30 p; 41 refs., 13 figs.
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ACTINIDE COMPOUNDS, CALCULATION METHODS, CARBIDES, CARBON COMPOUNDS, CHALCOGENIDES, COHERENT SCATTERING, CRYSTAL LATTICES, CRYSTAL STRUCTURE, DIFFRACTION, ELECTRICAL PROPERTIES, NUMERICAL SOLUTION, PHASE TRANSFORMATIONS, PHYSICAL PROPERTIES, SCATTERING, SELENIDES, SELENIUM COMPOUNDS, SULFIDES, SULFUR COMPOUNDS, THORIUM COMPOUNDS, URANIUM COMPOUNDS
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AbstractAbstract
[en] Glass-ceramic powders with a composition of Li2O·Al2O3·4SiO2 (LAS) have been synthesized by the sol-gel technique using LiOCH3, Al(OC2H5)3, Si(OC2H5)4, Ti(OC2H5)4, and Zr(OC2H5)4 as starting materials and investigated and the phase transformation behavior during calcination. Differential thermal analysis (DTA), x-ray diffraction (XRD), and scanning electron microscopy (SEM) were utilized to determine the thermal behavior of the gels. Considering the LAS gels with TiO2 6.0 wt.% and various wt.% ZrO2 content, the peak position of β-spodumene phase formation in DTA curves was shifted to a higher temperature when the ZrO2 content was increased. The activation energy of β-spodumene crystallization was 283.8 kcal/mol for LAS gels with TiO2 6.0 wt.% and 2.0 wt.% ZrO2. Unlike foregoing studies for LAS gels, during calcination of the dried LASTZ gels from 800 degree C to 1200 degree C neither β-eucryptite, nor γ-spodumene was noted to be present. The crystallized phases comprised of β-spodumenes as the major phase and rutile (TiO2) together with zirconia (ZrO2) are precipitated as minor phases. copyright 1996 Materials Research Society
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