Now showing items 1-20 of 41

  • 1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite 

    Vasiliev, A; Volkova, O; Zvereva, E; Ovchenkov, E; Munao', Irene; Clark, Lucy Mary; Lightfoot, Philip; Vavilova, E; Kamusella, S; Klaus, H; Werner, J; Koo, C; Klingeler, R; Tsirlin, A (2016-04-01) - Journal article
    The sodium-iron phosphite NaFe3(HPO3)2(H2PO3)6 is studied by ac-magnetic susceptibility, pulsed-field magnetization, specific heat, and high-frequency electron spin resonance (HF-ESR) measurements combined with Mössbauer ...
  • A complementary study of perovskites : combining diffraction, solid-state NMR and first principles DFT calculations 

    Johnston, Karen Elizabeth (University of St Andrews, 2010) - Thesis
    Perovskites, ABX₃, and their associated solid-solutions are a particularly important and attractive area of research within materials chemistry. Owing to their structural and compositional flexibility and potential ...
  • A crystallographic study of group I niobate perovskites 

    Peel, Martin D. (University of St Andrews, 2015-06-24) - Thesis
    In this work, X-ray and neutron powder diffraction experiments and complementary solid-state NMR spectroscopy are used to characterise NaNbO₃-based perovskite phases. Samples of NaNbO₃, KₓNa₁₋ₓNbO₃ and LiₓNa₁₋ₓNbO₃ are ...
  • Cs7Sm11[TeO3]12Cl16 and Rb7Nd11[TeO3]12Br16, the new tellurite halides of the tetragonal Rb6LiNd11[SeO3]12Cl16 structure type 

    Charkin, Dmitri O.; Black, Cameron; Downie, Lewis James; Sklovsky, Dmitry E.; Berdonosov, Peter S.; Olenev, Andrei V.; Zhou, Wuzong; Lightfoot, Philip; Dolgikh, Valery A. (2015-12) - Journal article
    Two new rare-earth – alkali – tellurium oxide halides were synthesized by a salt flux technique and characterized by single-crystal X-ray diffraction. The structures of the new compounds Cs7Sm11[TeO3]12Cl16 (I) and ...
  • Emergent states in transition metal oxides 

    Gibbs, Alexandra S. (University of St Andrews, 2013-06-26) - Thesis
    Transition metal oxides adopt a wide variety of crystal structures and display a diverse range of physical phenomena from Mott insulating states to electron-nematics to unconventional superconductivity. Detailed understanding ...
  • Extending the family of V4+ S = ½ kagome antiferromagnets 

    Clark, Lucy Mary; Himeur, Farida Himeur; Black, Cameron; Athukorala Arachchige, Kasun Sankalpa; Slawin, Alexandra Martha Zoya; Morris, Russell Edward; Lightfoot, Philip (2015) - Journal article
    The ionothermal synthesis, structure, and magnetic susceptibility of a novel inorganic–organic hybrid material, imidazolium vanadium(III,IV) oxyfluoride [C3H5N2][V9O6F24(H2O)2] (ImVOF) are presented. The structure consists ...
  • Gapless Spin Liquid Ground State in the S=1/2 Vanadium Oxyfluoride Kagome Antiferromagnet [NH4 ]2[C7H14N][V7O6F18] 

    Clark, L.; Orain, J. C.; Bert, F.; De Vries, M. A.; Himeur, Farida Himeur; Morris, Russell Edward; Lightfoot, Philip; Lord, J. S.; Telling, M. T. F.; Bonville, P.; Attfield, J. P.; Mendels, P.; Harrison, A. (2013-05-16) - Journal article
    The vanadium oxyfluoride [NH4]2[C7H14N][V7O6F18] (DQVOF) is a geometrically frustrated magnetic bilayer material. The structure consists of S=½ kagome planes of V4+ d1 ions with S=1 V3+ d2 ions located between the kagome ...
  • High-temperature phases of multiferroic BiFe0.7Mn0.3O3 

    Gibbs, Alexandra S.; Arnold, Donna C.; Knight, Kevin S.; Lightfoot, Philip (2013-06-17) - Journal article
    We report the results of a high-resolution powder neutron-diffraction study of multiferroic BiFe0.7Mn0.3O3. We have confirmed the previous assignment of the alpha phase and beta phase as having R3c and Pbnm symmetry, ...
  • A hybrid vanadium fluoride with structurally isolated S=1 kagome layers 

    Aidoudi, Farida H.; Downie, Lewis J.; Morris, Russell E.; de Vries, Mark A.; Lightfoot, Philip (2014) - Journal article
    A new organically-templated vanadium(III) fluoride, (NH4)(2)( C2H8N)-[ V3F12], has been prepared using an ionothermal approach. This compound has a unique layered structure featuring distorted S = 1 kagome planes separated ...
  • An ionothermally prepared S=1/2 vanadium oxyfluoride kagome lattice 

    Himeur, Farida Himeur; Aldous, David William; Goff, Richard John; Slawin, Alexandra Martha Zoya; Attfield, J. Paul; Morris, Russell Edward; Lightfoot, Philip (2011-10) - Journal article
    Frustrated magnetic lattices offer the possibility of many exotic ground states that are of great fundamental importance. Of particular significance is the hunt for frustrated spin-1/2 networks as candidates for quantum ...
  • Metal-dependent structural variations and the peculiarities of hydrogen-bonded networks in the highly hydrated copper(II), nickel(II) and palladium(II) complexes of bis-dioxocyclam 

    Gavrish, Sergey P.; Lampeka, Yaroslaw D.; Lightfoot, Philip (2015-04-01) - Journal article
    The crystal structures of the copper(II) (Cu2L14B·9H2O and Cu2L14B·12H2O), nickel(II) (Ni2L14B·12H2O) and palladium(II) (Pd2L14B·12H2O) complexes of the C-C linked bis-dioxocyclam ligand have been determined by single ...
  • Na2Fe(C2O4)F2 : a new iron-based polyoxyanion cathode for Li/Na ion batteries 

    Yao, Wenjiao; Sougrati, Moulay-Tahar; Hoang, Khang; Hui, Jianing; Lightfoot, Philip; Armstrong, A. Robert (2017-03-14) - Journal article
    A new mixed anion compound, Na2Fe(C2O4)F2 has been prepared by hydrothermal synthesis. The crystal structure exhibits infinite chains of corner-linked FeII-centred octahedra, with coordination composed of both oxalate and ...
  • Na2MoO2−δF4+δ – a perovskite with a unique combination of atomic orderings and octahedral tilts 

    Ishikawa, Hajime; Munao', Irene; Bode, Bela Ernest; Hiroi, Zenji; Lightfoot, Philip (2015-10-28) - Journal article
    Na2MoO2−δF4+δ (δ ∼ 0.08) displays a unique variant of the perovskite structure, with simultaneous (Na,vacancy) ordering on the A-site, (Na,Mo) ordering on the B-site, (O,F) ordering on the anion site and an unusual NaNbO3-like ...
  • NaFe3(HPO3)2((H,F)PO2OH)6 : a potential cathode material and a novel ferrimagnet 

    Munao, Irene; Zvereva, Elena; Volkova, Olga; Vasiliev, Alexander; Armstrong, Robert; Lightfoot, Philip (2016-03-07) - Journal article
    A novel iron fluorophosphite, NaFe3(HPO3)2((H,F)PO2OH)6, was synthesized by a dry low-temperature synthesis route. The phase was shown to be electrochemically active for reversible insertion of Na+ ions, with an average ...
  • NdBaScO4: aristotype of a new family of geometric ferroelectrics? 

    Cochrane, Amber; Telfer, Michael; Dixon, Charlotte Amy Louise; Halasyamani, P. Shiv; Zhang, Weiguo; Bousquet, Eric; Lightfoot, Philip (2016-09-21) - Journal article
    NdBaScO4 represents the aristotype structure of a new series of <110>-cut layered perovskites; it is suggested that compositional fine-tuning is likely to produce a family of new geometric ferroelectrics, driven primarily ...
  • New iron tetrazolate frameworks : synthesis temperature effect, thermal behaviour, Mössbauer and magnetic studies 

    Pimenta, Vanessa; Le, Quang Hoang Hanh; Clark, Lucy Mary; Lhoste, Jérôme; Hémon-Ribaud, Annie; Leblanc, Marc; Grenèche, Jean-Marc; Dujardin, Gilles; Lightfoot, Philip; Maisonneuve, Vincent (2015-05-07) - Journal article
    The exploration of the FeF3/FeF2-Hamtetraz-HF system in dimethylformamide by solvothermal synthesis evidences two isostructural 3D hybrid fluoroferrates. They are prepared from the same starting mixture at two different ...
  • New structural units in molybdenum oxyfluoride chemistry 

    Aldous, David W.; Lightfoot, Philip (2012-12) - Journal article
    The solvothermal syntheses and crystal structures of five new molybdenum oxyfluorides are presented. These exhibit three novel structural units, each containing Mo in a reduced oxidation state: a dimeric [MO2O4F2(C2H8N2)(2)] ...
  • A novel copper oxalate, Na2Cu(C2O4)2 

    Yao, Wenjiao; Armstrong, A. Robert; Lightfoot, Philip (2016-12-05) - Journal article
    A novel copper oxalate Na2Cu(C2O4)2 was synthesized through a hydrothermal method and characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic system, P21/n space group with a = 72578(3) Å, b = ...
  • Novel S = 1/2 kagome lattice materials : Cs2TiCu3F12 and Rb2TiCu3F12 

    Downie, Lewis James; Ardashnikova, Elena I.; Tang, Chiu C.; Vasiliev, Alexandre N.; Berndonosov, Peter S.; Dolgikh, Valery A.; de Vries, Mark A.; Lightfoot, Philip (2015-05-05) - Journal article
    Two new members of the A2B′Cu3F12 family of kagome-related materials have been prepared, in order to further understand the crystal-chemical relationships, phase transitions and magnetic behaviour within this family of ...
  • Phase transition behavior of the layered perovskite CsBi0.6La0.4Nb2O7 : a hybrid improper ferroelectric 

    Dixon, Charlotte A. L.; McNulty, Jason A.; Knight, Kevin S.; Gibbs, Alexandra S.; Lightfoot, Philip (2017-05-13) - Journal article
    The phase behavior of the layered perovskite CsBi0.6La0.4Nb2O7, of the Dion-Jacobson family, has been studied by high-resolution powder neutron diffraction between temperatures 25 < T < 850 °C. At ambient temperature this ...