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The structure of BaMg1/3Ta2/3O3 (BMT) has been studied using X-rayscattering. The phonons have been measured and the results are similar to thoseof other materials with the perovskite structure such as PbMg1/3Nb2/3O3 (PMN).The acoustic and lowest energy optic branches were measured but it was notpossible to measure the branches of higher energy, possibly this is becausethey largely consist of oxygen motions. High-resolution inelastic measurementsalso showed that the diffuse scattering was strictly elastic and not directlyrelated to the phonon spectra. A diffuse scattering was observed in BMT nearthe (H\pm1/2, K\pm1/2, L\pm1/2) points in the Brillouin zone and this had acharacteristic cube shape. This arises from ordering of the B-site ions in BMT.Additional experiments revealed a diffuse scattering in BMT similar in shape toBragg reflections at wave-vectors of the form (H\pm1/3, K\pm1/3, L\pm1/3). Suchreflections were also observed by Lufaso [Chem. Matt. 16 (2004) 2148] frompowders and suggest that this structure of BMT consists of 4 differentlyoriented domains of a trigonal structure and results from a different orderingof the B-site ions from that responsible for the scattering at the (H\pm1/2,K\pm1/2, L\pm1/2) points. The results lead us to suggest that for BMT singlecrystals the bulk has the properties of a cubic perovskite, whereas the surfacemay have quite different structure from that of the bulk. This differenceresembles the behaviour of cubic relaxors like PMN and PMN doped by PbTiO3,where significant surface effects have been reported.

The Structure and Low-Energy Phonons of the Nonferroelectric Mixed Perovskite: BaMg1/3Ta2/3O3