Listar Ciencias Exactas y Naturales por autor "Antonietti, Volmir"

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    • Bicriticality in Fe/sub x/Co/sub 1-x/Ta/sub 2/O/sub 6/ 

      Kinast, Eder Julio; Antonietti, Volmir; Schmitt, Denys; Isnard, Olivier; Cunha, Joao Batista Marimon da; Gusmao, Miguel Angelo Cavalheiro; Santos, Carlos Alberto dos (2003) [Artículo de periódico]
      X-ray and neutron-diffraction, dc magnetic susceptibility, magnetization, and specific-heat measurements are reported for FexCo1 xTa2O6 mixed oxides. X-ray refinement indicates homogeneous samples for all the reported ...

    • Crystal chemistry and structure of the orthorhombic (Fe, Mn)(Ta, Nb)/sub 2/O/sub 6/ family of compounds 

      Santos, Carlos Alberto dos; Zawislak, Luci Irene; Kinast, Eder Julio; Antonietti, Volmir; Cunha, Joao Batista Marimon da (2001) [Artículo de periódico]
      In this paper we review the crystal chemistry and structure data from the literature and our results reported in the last decade for natural and synthetic samples of the tantalite-columbite series. Orderdisorder transitions ...