Browsing by author "Avdeev, Maxim"
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Alkali metal modified P2 NaxMnO2: Crystal structure and application in sodium-ion batteries
Sehrawat, D; Rawal, A; Cheong, S; Avdeev, Maxim; Ling, Chris D; Kimpton, J A; Sharma, NeerajPublished 2020Sodium-ion batteries (NIBs) are an emerging alternative to lithium-ion batteries because of abundant sodium re-sources and the potentially lower cost. Here we report the Na0.7MnO2 solid-state synthesized at 1000 oC which ...Open AccessArticle -
Beyond the Ionic Radii: A Multifaceted Approach to Understand Differences between the Structures of LnNbO4 and LnTaO4 Fergusonites
Mullens, Bryce; Saura-Múzquiz, Matilde; Marlton, Frederick; Avdeev, Maxim; Brand, Helen E. A.; Mondal, S.; Vaitheeswaran, G.; Kennedy, Brendan JamesPublished 2023Synchrotron X-ray powder diffraction methods have been used to obtain accurate structures of the lanthanoid tantalates, LnTaO4, at room temperature. Three different structures are observed, depending on the size of the Ln ...Open AccessArticle -
Cation and lone pair order-disorder in the polymorphic mixed metal bismuth scheelite Bi3FeMo2O12
Saura-Múzquiz, Matilde; Marlton, Frederick; Mullens, Bryce; Liu, Jiatu; Maynard-Casely, Helen Elizabeth; Avdeev, Maxim; Blom, Douglas A.; Vogt, Thomas; Kennedy, Brendan JamesPublished 2022The Bi3FeMo2O12 system is examined as a rare example of a transition metal oxide which, upon heating, undergoes a symmetry lowering and 2:1 ordering of the transition metal cations. The compound was synthesised in the ...Open AccessArticle -
Complex 5d magnetism in a novel S = ½ trimer system, the 12L hexagonal perovskite Ba4BiIr3O12
Miiller, Wojciech; Dunstan, Matthew T; Huang, Zixin; Mohamed, Zakiah; Kennedy, Brendan J; Avdeev, Maxim; Ling, Chris DPublished 2013The 12L hexagonal perovskite Ba4BiIr3O12 has been synthesized for the first time and characterized using high-resolution neutron and synchrotron x-ray diffraction as well as physical properties measurements. The structure ...Open AccessArticle -
Crystal and magnetic structure of monoclinic FeOHSO4
Avdeev, Maxim; Barpanda, P; Ling, Chris D; Singh, ShashwatPublished 2021Crystal and magnetic structure and properties of the monoclinic form of FeOHSO4 hydroxysulfate were investigated by magnetometry and neutron powder diffraction. The space group C2/c was confirmed and the proton position ...Open AccessArticle -
Crystal structure and monoclinic distortion of glaserite-type Ba3MnSi2O8
Avdeev, Maxim; Xia, Qingbo; Sale, Matthew; Allison, Morgan; Ling, Chris DPublished 2018Crystal structure and magnetic properties of glaserite-type Ba3MnSi2O8 were investigated using variable temperature neutron powder diffraction and magnetometry. At room temperature the composition is hexagonal and the ...Open AccessArticle -
Expanded chemistry and proton conductivity in vanadium-substituted variants of γ-Ba4Nb2O9
Brown, Alex J; Schwaighofer, B; Avdeev, Maxim; Johannessen, B; Evans, I R; Ling, Chris DPublished 2021We have substantially expanded the chemical phase space of the hitherto unique γ- Ba4Nb2O9 type structure by designing and synthesising stoichiometric ordered analogues γ- Ba4V1/3Ta5/3O9 and γ-Ba4V1/3Nb5/3O9, and exploring ...Open AccessArticle -
Experimental and Computational Insights into the Anomalous Thermal Expansion of NH¬4ReO4
Saura-Múzquiz, Matilde; Mullens, Bryce; Avdeev, Maxim; Jharapla, PK.; Vaitheeswaran, G.; Gupta, M. K.; Mittal, R.; Kennedy, Brendan JamesPublished 2022The temperature dependence of the structure and the ground state properties of scheelite type NH4ReO4 have been studied using neutron powder diffraction (NPD) and Density Functional Theory (DFT), respectively. Despite the ...Open AccessArticle -
Experimental Observation and Computational Study of the Spin-gap Excitation in Ba3BiRu2O9
Ling, Chris D; Huang, Zixin; Kennedy, Brendan J; Rols, S; Johnson, M R; Zbiri, M; Kimber, S A J; Hudspeth, J; Adroja, D T; Rule, K C; Avdeev, Maxim; Blanchard, Peter E RPublished 2016Ba3BiRu2O9 is a 6H-type perovskite compound containing face-sharing octahedral M2O9 (M = Ir, Ru) dimers, which are magnetically frustrated at low temperatures. On cooling through T∗ = 176 K, it undergoes a pronounced ...Open AccessArticle -
FeMn3Ge2Sn7O16: a perfectly isotropic 2-D kagomé lattice that breaks magnetic symmetry with partial spin order
Allison, Morgan C; Wurmehl, Sabine; Büchner, Bernd; Vella, Joseph L.; Söhnel, Tilo; Bräuninger, Sascha A.; Klauss, Hans-Henning; Avdeev, Maxim; Marlton, Frederick P.; Schmid, Siegbert; Ling, Chris DPublished 2022FeMn3Ge2Sn7O16 is a fully ordered stoichiometric phase containing an undistorted hexagonal kagomé lattice of Mn2+ cations. It represents not only an important expansion of the chemistry of the complex composite FeFe3Si2Sn7O16 ...Open AccessArticle -
The ferroelectric phase of CdTiO3. A powder neutron diffraction study.
Kennedy, Brendan J; Zhou, Qingdi; Avdeev, MaximPublished 2011-01-01The 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 AccessArticle -
Hydration mechanisms and proton conduction in the mixed ionic-electronic conductors Ba4Nb2O9 and Ba4Ta2O9
Ling, Chris D; Avdeev, Maxim; Wind, Julia; Yu, Dehong; Mole, Richard APublished 2018-01-01Open AccessArticle -
Impact of Cu Doping on the Structure and Electronic Properties of LaCr1–yCuyO3
Ilyas, Qasim; Peter, ER Blanchard; Samuel, Liu; Brendan, Kennedy; Avdeev, MaximPublished 2014Oxides of the type LaCr1-yCuyO3 have been prepared using solid-state methods and their crystal structures refined using synchrotron X-ray powder diffraction. The solubility limit of Cu was found to be around y = 0.2, and ...Article -
Investigation of K-modified P2-Na0.7Mn0.8Mg0.2O2 as a cathode material for sodium-ion batteries
Sehrawat, D; Cheong, S; Avdeev, Maxim; Ling, Chris D; Kimpton, J A; Sharma, NeerajPublished 2019Sodium-ion batteries (NIBs) are emerging as a potentially cheaper alternative to lithium-ion batteries (LIBs) due to the larger abundance of sodium and in some cases the similar intercalation chemistry to LIBs. Here we ...Open AccessArticle -
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 DPublished 2014The 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 AccessArticle -
Magnetic and structural studies of Sc containing ruthenate double perovskites A2ScRuO6 (A = Ba, Sr).
Kayser, Paula; Injac, Sean; Ranjbar, Ben; Kennedy, Brendan J; Avdeev, Maxim; Yamaura, KazunariPublished 2017-01-01Ruthenium containing double perovskites A2ScRuO6 have been synthesized as polycrystalline powders and structurally characterized using a combination of synchrotron X-ray and neutron powder diffraction methods. When A = ...Open AccessArticle -
Magnetic structure and properties of the Na2CoP2O7 pyrophosphate cathode for sodium-ion batteries: a super-superexchange driven non-collinear antiferromagnet
Barpanda, P; Avdeev, Maxim; Ling, Chris D; Lu, J; Yamada, APublished 2013The crystal and magnetic structure and properties of the Na2CoP2O7 sodium-ion battery cathode material have been characterized by magnetic susceptibility, specific heat, and variable temperature neutron powder diffraction ...Open AccessArticle -
Magnetic Structure and Properties of the Rechargeable Battery Insertion Compound Na2FePO4F
Avdeev, Maxim; Ling, Chris D; Oyama, G; Yamada, A; Barpanda, P; Tan, Thiam Teck; Li, SeanPublished 2014The magnetic structure and properties of sodium iron fluorophosphate Na2FePO4F (s.g. Pbcn), a cathode material for rechargeable batteries, were studied using magnetometry and neutron powder diffraction. The material, which ...Open AccessArticle -
Magnetic structures of NaFePO4 marićite and triphylite polymorphs for sodium-ion batteries
Avdeev, Maxim; Barpanda, P; Mohamed, Zakiah; Ling, Chris D; Lu, J; Yamada, APublished 2013The magnetic structure and properties of polycrystalline NaFePO4 polymorphs, maricite and triphylite, both derived from the olivine structure type, have been investigated using magnetic susceptibility, heat capacity, and ...Open AccessArticle -
Magnetic structures of βI-Li2CoSiO4 and γ0-Li2MnSiO4: crystal structure type vs. magnetic topology
Avdeev, Maxim; Mohamed, Zakiah; Ling, Chris DPublished 2014The magnetic structure and properties of the candidate lithium-ion battery cathode materials Pbn21(≡Pna21) Li2CoSiO4 and P21/n Li2MnSiO4 have been studied experimentally using low-temperature neutron powder diffraction and ...Open AccessArticle
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