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Digitale Medien

Novel Synthesis for Ultrafine Barium Titanate Powders Using Peptized Titania Nano-Sol (2006)

Lee, Jai Joon ; Kim, Jun Tae ; Park, Kum Jin ; [weitere]

s.l. ; Stafa-Zurich, Switzerland

Advances in science and technology Vol. 45 (Oct. 2006), p. 254-259

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ISSN: 1662-0356

Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Thema: Allgemeine Naturwissenschaft , Technik allgemein

Notizen: We have investigated a novel synthesis for highly spherical and ultrafine barium titanate(BaTiO3) powders using a peptized titania (TiO2) nano-sol as a precursor. The obtained TiO2nano-sol had the size less than 10 nm, which could be easily converted to BaTiO3 under 100 ℃. Thesize of the resulting BaTiO3 powder could be controlled from 42 to 167 nm by lowering the solutionconcentration from 1.00 M to 0.15 M. BET analysis indicated that the as-prepared BaTiO3 powdershad some porosity which was increased with the particle size. It was also found that the as-preparedBaTiO3 with smaller size had higher tetragonality and less intra-granular pores after annealing

Materialart: Digitale Medien

URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.254.pdf

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Digitale Medien

Microstructures and crystallization of electroless Ni-P deposits (1990)

Hur, Kang-Heon ; Jeong, Jae-Han ; Lee, Dong Nyung

Springer

Journal of materials science 25 (1990), S. 2573-2584

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ISSN: 1573-4803

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract A study has been made of microstructures and crystallization of the electroless Ni-P deposits containing 11.3 to 23.0 at% P obtained from acidic nickel sulphate baths with sodium hypophosphite as a reducing agent by means of differential scanning calorimetry, X-ray diffractometry and hot stage transmission electron microscopy. The deposits containing low phosphorus content of 11.3 at% could be represented as an fcc Ni-P solid solution of 5 to 10 nm microcrystallites, whereas the deposits containing high phosphorus content were amorphous. The crystallization process of amorphous Ni-P solution involved more than one intermediate phases; precrystallized nickel or off-stoichiometric Ni3(P, Ni) or Ni5(P, Ni)2 phase in which some phosphorus sites are replaced by nickel atoms. The final equilibrium phases were bct Ni3P and fcc nickel crystals regardless of phosphorus content. The amorphous phase containing 20 to 22 at% phosphorus was the most stable among the amorphous Ni-P alloys.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00638061

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Digitale Medien

Effect of annealing on magnetic properties and microstructure of electroless nickel-copper-phosphorus alloy deposits (1991)

Hur, Kang-Heon ; Jeong, Jae-Han ; Lee, Dong Nyung

Springer

Journal of materials science 26 (1991), S. 2037-2044

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ISSN: 1573-4803

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract The relationship between magnetic properties and microstructure of the as-deposited and heat-treated Ni-Cu-P alloy deposits has been studied by means of vibrating sample magnetometry, differential scanning calorimetry. X-ray diffractometry and hot-stage transmission electron microscopy. The Ni-Cu-P deposits consist of low-P Ni-Cu solid solution crystallites and high-P-low-Ni-Cu amorphous phase. When the deposits are annealed at elevated temperatures, the Ni-Cu crystallites grow rejecting P from themselves and absorbing Cu from the neighbouring amorphous phase, while the P-rich amorphous phase transforms into Ni5P2 phase or into Ni5P2 and Ni3P phases. The metastable Ni5P2 phase finally transforms into the stable Ni3P phase. The non-magnetism observed in Ni-Cu-P deposits having a copper content above 28% in both as-deposited and annealed states, is attributed to their Cu-rich Ni-Cu solid solution crystallites. Nickel phosphides which crystallize from the amorphous phase existing mixed with the Ni-Cu crystallites in the as-deposited state, do not affect the saturated magnetic moment of the deposits.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00549164

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