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Phase transitions in Li.sub.x./sub.Ag.sub.1-x./sub.(Nb.sub.0.5./sub.Ta.sub.0.5./sub.)O.sub.3./sub. solid solutions

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    0437633 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
    Khan, H.U. - Sterianou, I. - Han, Y. - Pokorný, Jan - Reaney, I. M.
    Phase transitions in LixAg1-x(Nb0.5Ta0.5)O3 solid solutions.
    Journal of Applied Physics. Roč. 108, č. 6 (2010), "064117 -1"-"064117 -6". ISSN 0021-8979. E-ISSN 1089-7550
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: silver niobate
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.064, rok: 2010

    LixAg1-x(Nb0.5Ta0.5)O-3 (0 <= x <= 0.25) solid solutions have been fabricated by the mixed oxide method. Compositions with x <= 0.15 were single phase perovskite by x-ray diffraction (XRD) and could be indexed using the end member, Ag(Nb0.5Ta0.5)O-3 Pbcm cell, root 2a, root 2a, 4a (where a is the pseudocubic lattice parameter). For x >= 0.20, Li(Nb, Ta)O-3 peaks emerged as a second phase. Electron diffraction patterns from the perovskite phase could also be indexed according to the Pbcm cell but there was a systematic decrease in the intensity of {00 1/4}(p) as Li concentration increased which indicated that the correlation length of cation displacements perpendicular to c decreased from long to short range order. The reduction in correlation length of cation displacements resulted in a convergence of the M-1-M-2-M-3 transitions to give a single broad, frequency dependent maximum at x=0.15. Further increase in Li concentration did not qualitatively affect the temperature dependent dielectric data, consistent with the solubility limit determined by XRD. P-E loops did not show any significant enhancement in switchable polarization in the system with the majority of samples exhibiting a linear dielectric response.
    Trvalý link: http://hdl.handle.net/11104/0241145

     
     
Počet záznamů: 1  

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