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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and Magnetic Property of Bi〈sub〉2〈/sub〉Fe〈sub〉4〈/sub〉O〈sub〉9〈/sub〉 Nanoparticles by Hydrothermal Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 112-114 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bi2Fe4O9 nanoparticles were prepared at low temperature via a facile, one-step hydrothermalsynthesis process using iron(III) nitrate nonahydrate (Fe(NO3)3•9H2O) and bismuth nitrate pentahydrate(Bi(NO3)3•5H2O) as starting materials and sodium hydroxide (NaOH) as precipitant and mineralizer.XRD results indicated that the as-prepared nanoparticles are pure orthorhombic Bi2Fe4O9. SEM imagesrevealed that the as-prepared Bi2Fe4O9 nanoparticles have a sheet-like morphology. They areparamagnetic at room temperature demonstrated by the magnetic measurements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.112.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Low Temperature Synthesis of BiFO〈sub〉3〈/sub〉 Film by Hydrothermal Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 623-625 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Polycrystalline BiFeO3 multiferroic films were fabricated on Ti substrates by hydrothermalmethod from an aqueous Bi (NO3)3•5H2O, FeCl3•6H2O and NaOH solution. The films grow in alkalinesolution at low temperatures of 120ºC-240ºC for 18 hours. XRD analysis showed that well-developedcrystallines with single perovskite crystal phase were obtained. It was also found that the increase ofreaction temperature and concentration of NaOH were favorable for crystal growth and crystallographicregularization. The microstructure, thickness and cross-section of the films were characterized by FESEM and EDS. Results indicated that dense and homogeneous BiFeO3 thin films could be obtained in anappropriate hydrothermal condition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.623.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrothermal Synthesis of Sodium-Potassium Niobate Nanopowders (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 579-581 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Sodium-potassium Niobate (K0.4Na0.6NbO3, KNN) nanopowders were prepared by hydrothermalsynthesis at the temperature range of 140-180°C for 12-48h using Nb2O5, NaOH and KOH assource materials. By means of XRD and SEM techniques, the effects of composition and hydrothermaltreatment process, such as the rate of [R]/[Nb], the concentration of the alkali, the hydrothermal treatmenttemperature and the hydrothermal treatment time, on the microstructures and the crystallinity of alkalimetals niobate were investigated in details. Results show that K0.4Na0.6NbO3 powders could be achievedby hydrothermal synthesis at the temperature range of 140-180°C with the alkalinity concentration of2-8M. With the increase of hydrothermal reaction temperature and time, the crystallinity of KNNparticles was improved. The obtained K0.4Na0.6NbO3 polycrystalline particles have rhombic structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.579.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesizing Silicon Nitride Whiskers by Solvothermal and Carbothermal Methods (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 868-870 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Xerogel was prepared by the sol-gel method using ethyl ester orthosilicate, alcohol, carbamideand glucose with various contents as raw materials. The precursor powders were obtained after xerogelwas solvothermally treated at 220oC for 2.5 h. IR analyses showed that the Si-O-Si and Si-O-NH2 bondare obtained in the precursors. XRD analyses indicated that the powders prepared by the solvothermalmethod are amorphous. Si3N4 powders are produced by heat-treating the precursors at 1400 oC in N2. Itwas proved that the synthesized powders are α–Si3N4 whiskers. With the increase of the glucose contentsand the heat-treating temperature, the crystallization of Si3N4 is obviously improved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.868.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation of Barium Strontium Titanate Nanopowders by a Sol-Gel Hydrothermal Synthesis Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 50-52 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Barium strontium titanate, BST (BaxSr1-xTiO3), nanoparticles were prepared by a sol-gelhydrothermal technique. BST powders of different composition (x=0.1, x=0.3, x= 0.5, x=0.7, x=0.9)prepared by sol-gel technique previously were treated by hydrothermal synthesis method later. XRDresults indicated that the as-prepared perovskite BST nanoparticles have the accurate proportioningcomposition. These results showed that the combination of sol-gel and hydrothermal technique wouldbecome a potential and promising process for fabricating BST and other nanopowders
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.50.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of Zn〈sub〉1-x〈/sub〉Co〈sub〉x〈/sub〉O Diluted Magnetic Semiconductor by Hydrothermal Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 620-622 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zn1-xCoxO diluted magnetic semiconductor was prepared by hydrothermal method at 200 ºCand 240 ºC for 24h with the Co2+ doping content of 5~15 mol%. NaOH was used as the mineralizer. X-raydiffraction analysis indicated that the as-prepared Co-doped ZnO had the pure ZnO wurtzite structure.UV–Visible spectroscopy had shown that the Co ions are substituted to Zn ions in ZnO matrix. Roomtemperature VSM revealed a paramagnetic behavior of the Co-doped ZnO samples. FE-SEM analysesshowed that nanocrystalline powders of pure Zn095Co0.05O and Zn09Co0.1O could be prepared by thehydrothermal method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.620.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fabrication of (Ba,Sr)TiO〈sub〉3〈/sub〉 Thin Films by Hydrothermal Crystallization of Sol-Gel Precursor (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 95-97 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Barium strontium titanate (BST) ferroelectric thin films have been successfully prepared on thesingle crystal silicon substrates using hydrothermal crystallization of sol-gel precursor, which combinedthe conventional sol-gel process and the hydrothermal method. The precursor film was deposited by thedip-coating method. The multiplayer BST gel films were hydrothermally treated in a Teflon vessel at lowtemperature of 160-180 °C for 1-3.5 h. The influences of the reaction conditions on the structure andcrystallizing degree of BST thin films were discussed. We find that the temperature of as-dried gel filmsand post hydrothermal treatment are the critical parameters determining the quality of formation of BSTthin films. Under optimized conditions, we can obtain well-developed perovskite BST films with smoothand pinhole-free surfaces. These results reveal that this technique is a promising low temperature processfor the fabricating of thin films
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.95.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesizing Nano-Scale Titanium Nitride Powders by Solvothermal and Carbothermal Methods (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2079-2081 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Xerogel was prepared by the sol-gel method using butyl titanate, alcohol, carbamide andglucose as raw materials. The precursor powders were obtained after xerogel was solvothermally treatedat 220oC for 2 h. The IR analysis suggests that the precursor with 10% excess glucose gave an absorptionpeak at 1084.37cm-1, which was assigned to Ti-OH bond, while no such a peak can be observed for thatwith 30% excess glucose. The prepared precursor powders were then sintered at 1400oC in nitrogenatmosphere. XRD and SEM results indicated that the sintering time and the contents of glucose had greateffects on synthesizing titanium nitride powders. The titanium nitride powders with a high purity and amean grain size of about 35 nm could be prepared by heating the precursor with 10% excess glucose at1400oC for 6.5 h
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2079.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Hydrothermal Preparation of Bismuth Titanate Nanopowders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 161-164 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bismuth titanate nanopowders were prepared by the hydrothermal method fromBi(NO3)3·5H2O, TiCl4 and KOH aqueous solution. The influences of reaction temperature and KOHconcentration on the crystalline phase, morphology, and grain size of the prepared Bi4Ti3O12 powderswere investigated. The results showed that well-crystallized, dispersive Bi4Ti3O12 nanopowders couldbe prepared by the hydrothermal treatment at 220–260[removed info]˚C for 6 h, in the case of [Ti]= 0.1 M, Bi:Ti =4:3 and [KOH]=1.0–2.0 M. The prepared Bi4Ti3O12 powders of the orthorhombic structure wereobserved to be rectangle slice-shaped, and the grain sizes were about 30 nm in width and above100nm in length. It was also confirmed that the desired concentration of KOH decreased with increasingof the treatment temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.161.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Low-Temperature Sintering of 3Y-TZP/Glass Composites as All-Ceramic Dental Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1593-1595 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 3Y-TZP ceramics were fabricated with the addition of 10wt% MgO-Al2O3-SiO2 glass additiveby cold-isostatic pressing and afterwards liquid-phase sintering at 1200-1400°C for 2 h. The densities ofsamples sintered at 1300°C for 2 h reaches 99.1%, but further increase of sintering temperature results inthe decrease of densities. XRD analysis showed that the cordierite crystals and a small amount of amorphousphase were presented at the grain junctions, and SEM observation indicated that the mean grainsize of ZrO2 with round-shape ranged from 200 to 300 nm, which was below the critical transformationsize, and the increase in sintering temperature was accompanied with an increase in the mean grain size.The strength and toughness of samples were kept in the range of 396-528 MPa, 4.4-5.8 MPa·m1/2 respectively,which could meet the need of clinical applications of all-ceramic dental materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1593.pdf
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