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  • 1.
    Blomqvist, H
    et al.
    Department of Structural Chemistry, Stockholm University.
    Noreus, D
    Department of Structural Chemistry, Stockholm University.
    Babushkin, O
    Nion, F
    Luleå tekniska universitet.
    Vuorinen, Esa
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Structure and resistivity correlations in Mg₂NiH₄ studied with in situ X-ray diffraction2003In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 22, no 21, p. 1487-1489Article in journal (Refereed)
    Abstract [en]

    Structure and resistivity correlations in Mg2NiH4 was studied using in situ X-ray diffraction. Microtwinning was found to be sensitive to the applied mechanical pressure or grinding and by compressing the heated hydride sample in a tablet press. The resistivity increased before the low-temperature->high temperature phase transition.

  • 2.
    Haviar, M.
    et al.
    Institute of Inorganic Chemistry, Slovak Academy of Sciences.
    Herbertsson, Harald
    Luleå tekniska universitet.
    The stability of yttrium α-sialon under high pressures 199302221993In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 12, no 24, p. 1888-1890Article in journal (Refereed)
  • 3.
    Havlar, M.
    et al.
    Institute of Inorganic Chemistry, Slovak Academy of Sciences.
    Lenčéš, Z.
    Institute of Inorganic Chemistry, Slovak Academy of Sciences.
    Herbertsson, Harald
    Luleå tekniska universitet.
    The stability of yttrium α-SiAlON and β-SiAlON at high pressure and high temperature1997In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 16, no 3, p. 236-238Article in journal (Refereed)
  • 4.
    Lei, B.Q.
    Luleå tekniska universitet.
    Mechanism of nitridation at the melting temperature of silicon1996In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 15, no 8, p. 670-671Article in journal (Refereed)
  • 5.
    Mintova, Svetlana
    et al.
    Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences.
    Valtchev, Valentin
    Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences.
    Shoeman, Brian J.
    Luleå tekniska universitet.
    In situ deposition of silicalite-1 on ZrO2 fibres1996In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 15, no 10, p. 840-841Article in journal (Refereed)
  • 6.
    Niska, John
    et al.
    Luleå tekniska universitet.
    Andersson, B.M.
    Umeå universitet.
    Loberg, Bengt
    Easterling, Kenneth
    Luleå tekniska universitet.
    Sundqvist, B.
    Umeå universitet.
    Formation of the 124-phase superconductor YBa2Cu4O8 by retaining oxygen in a reaction HIP sintering process1990In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 9, no 7, p. 770-771Article in journal (Refereed)
    Abstract [en]

    The sample was hot isostatically pressed at about 1005°C and 200 MPa using a hold time of 2h. The HIP was slowly cooled to about 400°C while retaining high pressure to avoid decomposition. The zero resistance Tc is about 70 K, which is lower than expected. The microhardness can be related to the yield strength, with the maximum strength approximately one-third the Vickers hardness. The use of HIP to form the 124-phase superconductor by reaction sintering gives a dense bulk superconducting material suitable for mechanical and electrical tests requiring sintered bodies. The superconductor has high hardness and therefore a high compressive strength, but it was also brittle. This brittle behaviour could lead to difficulties is fabricating electrical devices from the bulk material

  • 7.
    Niska, John
    et al.
    Luleå tekniska universitet.
    Babushki, O.
    Luleå tekniska universitet.
    Loberg, Bengt
    High-temperature X-ray diffraction of the PbBi-2223 phase superconductor in different atmospheres1993In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 12, no 17, p. 1337-1339Article in journal (Refereed)
  • 8. Tjernlund, Anna-Karin
    et al.
    Hermansson, L
    Swedish Institute of Silicate Research, Gothenburg.
    Carlsson, R
    Swedish Institute of Silicate Research, Gothenburg.
    Axelsson, K-O
    Volvo AB, Gothenburg.
    Influence of Combustion Atmospheres on the Phase Transformation of Zirconia1986In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 5, no 2, p. 129-131Article in journal (Refereed)
  • 9.
    Wei, L.Y.
    et al.
    Luleå tekniska universitet.
    Dunlop, G.L.
    University of Queensland.
    Crystal symmetry of the pseudo-ternary T-phases in Mg-Zn-rare earth alloys1996In: Journal of materials science letters, ISSN 0261-8028, E-ISSN 1573-4811, Vol. 15, no 1, p. 4-7Article in journal (Refereed)
    Abstract [en]

    Crystal symmetry of the pseudo-ternary T-phases in Mg-Zn-rare earth alloys was observed. The convergent beam electron diffraction combined with selected area electron diffraction (SAED) determined the point group and space group for this phase. The phase was formed interdendritically during the solidification of the alloys. Extensive SAED detected a C-centered orthorhombic crystal structure of the phase. The space group for T-phase is Cmcm

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