Now showing items 1-20 of 52

    • 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 ...
    • Complex octahedral tilt phases in the ferroelectric perovskite system LixNa1–xNbO3 

      Dixon, Charlotte A. L.; Lightfoot, Philip (2018-06-21) - Journal item
      High-temperature phase behavior in the system LixNa1−xNbO3 has been studied by using high-resolution neutron powder diffraction. Each of the three compositions studied in the Na-rich part of the phase diagram (viz., ...
    • 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 ...
    • Diverse family of layered frustrated magnets with tailorable interlayer interactions 

      Yao, Wenjiao; Clark, Lucy; Xia, Mingjun; Li, Teng; Lee, Stephen L.; Lightfoot, Philip (2017-08-22) - Journal article
    • 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 ...
    • KLi3Fe(C2O4)3 : a perovskite-like compound with 1:3 ordering at both A and B sites 

      Yao, Wenjiao; Guo, Yuanyuan; Lightfoot, Philip (2017-10-21) - Journal article
      KLi3Fe(C2O4)3 adopts a perovskite-like structure with 1:3 ordering of (Li,Fe) on the B-site and (K,vacancy) on the A-site; there are no previous examples of this type of cation ordering in conventional perovskites.
    • 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 sarcosine-metal halide complexes related to the ferroelectric TSCC 

      Clulow, Rebecca; Lightfoot, Philip (2018-07-28) - Journal article
      There are relatively few sarcosine metal halide complexes. Of these, tris sarcosine calcium chloride (TSCC) ((C3NO2H7)3CaCl2) stands out as an unusual example of a molecular ferroelectric. Here we report the syntheses of ...