Ba3MIIITiMVO9 (MIII = Fe, Ga, Y, Lu; MV = Nb, Ta, Sb) perovskite oxides: synthesis, structure and dielectric properties

Joy, Joby E. ; Atamanik, Eric ; Mani, Rohini ; Nag, Abanti ; Tiwari, R. M. ; Thangadurai, V. ; Gopalakrishnan, J. (2010) Ba3MIIITiMVO9 (MIII = Fe, Ga, Y, Lu; MV = Nb, Ta, Sb) perovskite oxides: synthesis, structure and dielectric properties Solid State Sciences, 12 (12). pp. 1970-1976. ISSN 1293-2558

Full text not available from this repository.

Official URL: http://linkinghub.elsevier.com/retrieve/pii/S12932...

Related URL: http://dx.doi.org/10.1016/j.solidstatesciences.2010.08.009

Abstract

We describe the synthesis, structures and dielectric properties of new perovskite oxides of the formula, Ba3MIIITiMVO9, for MIII = Fe, Ga, Y, Lu and MV = Nb, Ta, Sb. While MV = Nb and Ta oxides adopt disordered/partially ordered 3C perovskite structures where MIII/Ti/MV metal-oxygen octahedra are corner-connected, the MV = Sb oxides show a distinct preference for the 6H structure, where SbV/TiIV metal-oxygen octahedra share a common face forming (Sb,Ti)O9 dimers that are corner-connected to the MIIIO6 octahedra. The preference of antimony oxides (SbV:4d10) for the 6H structure - which arises from a special SbV-O chemical bonding that tends to avoid linear Sb-O-Sb linkages unlike NbV/TaV:d0 atoms which prefer ~180° Nb/Ta-O-Nb/Ta linkages - is consistent with the crystal chemistry of MV-O oxides in general. The dielectric properties reveal a significant difference among MIII members. All the oxides with the 3C structure excepting those with MIII = Fe show a normal low loss dielectric behaviour with ε = 20-60 in the temperature range 50-400°C; the MIII = Fe members with this structure (MV = Nb, Ta) display a relaxor-like ferroelectric behaviour with large ε values at frequencies ≤1 MHz (50-500°C).

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Ba3MIIITiMVO9; 1:2 Double Perovskites; Structure; Dielectric Properties, AC Impedance
ID Code:12289
Deposited On:10 Nov 2010 05:16
Last Modified:02 Jun 2011 10:21

Repository Staff Only: item control page