• The ferroelectric phase of CdTiO3. A powder neutron diffraction study. 

      Kennedy, Brendan J; Zhou, Qingdi; Avdeev, Maxim
      Published 2011-01-01
      The synthesis of bulk samples of polycrystalline CdTiO3 in both the rhombohedral ilmenite and orthorhombic perovskite forms is described and the structures of these have been refined using powder neutron diffraction data. ...
      Open Access
      Article
    • The key role of bismuth in the magnetoelastic transitions of Ba3BiIr2O9 and Ba3BiRu2O9 as revealed by chemical doping 

      Blanchard, Peter E R; Huang, Zixin; Kennedy, Brendan J; Liu, Samuel; Miiller, Wojciech; Reynolds, Emily; Zhou, Qingdi; Avdeev, Maxim; Zhang, Z; Aitken, J B; Cowrie, B C C; Jang, L-Y; Li, Sean; Ling, Chris D
      Published 2014
      The key role played by bismuth in an average intermediate oxidation state in the magnetoelastic spin-gap compounds Ba3BiRu2O9 and Ba3BiIr2O9 has been confirmed by systematically replacing bismuth with La3+ and Ce4+. Through ...
      Open Access
      Article
    • Low temperature structure and the ferroelectric phase transitions in the CdTiO3 perovskite 

      Kennedy, Brendan J; Zhou, Qingdi; Zhao, Shipeng; Jia, Fanhao; Ren, Wei; Knight, Kevin S
      Published 2017-01-01
      The paraelectric-ferroelectric transition in CdTiO3 has been monitored using high resolution neutron diffraction data. This necessitated preparing a sample enriched in 114Cd. A subtle, but significant, anisotropy in the ...
      Open Access
      Article
    • Multi-scale Structural Analysis of the A-site and Oxygen Deficient Perovskite Sr11Mo4O2 

      King, Graham; Avdeev, Maxim; Qasim, Ilyas; Zhou, Qingdi; Kennedy, Brendan J
      Published 2017-01-01
      The long range average crystal structure, as well as the short and medium range structural features, of the A-site deficient and oxygen deficient perovskite Sr11Mo4O23 have been determined. Rietveld refinement of synchrotron ...
      Open Access
      Article
    • Tuning the Giant Magnetoelastic Transition in Ba3BiIr2O9 and Ba3BiRu2O9 

      Huang, Zixin; Avdeev, Maxim; Kennedy, Brendan J; Knight, Kevin S; Zhou, Qingdi; Ling, Chris D
      Published 2014
      We have experimentally investigated the effects of pressure on the magnetoelastic transitions associated with the opening of spin-gaps in Ba3BiIr2O9 and Ba3BiRu2O9. For both compounds, reducing the unit cell volume by ...
      Open Access
      Article