Browsing by author "Wang, Chun-Hai"
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The impact of anion ordering on octahedra distortion and phase transitions in SrTaO2N and BaTaO2N
Wang, Chun-Hai; Kennedy, Brendan J; Menezes de Oliveira, Andre; Polt, Julia; Knight, Kevin SPublished 2017-01-01In this work, we synthesized BaTaO2N and SrTaO2N using a two-step high temperature solid state reaction method and analysed the structural distortions, relative to the ideal cubic perovskite structure, according to group ...Open AccessArticle -
Multiple Competing Magnetic Interactions in Na4Ni7(PO4)6
Xia, Qingbo; Wang, Chun-Hai; Schmid, Siegbert A; Avdeev, Maxim; Ling, Chris DPublished 2019The low-temperature magnetic behavior and ground state of the candidate sodium-ion battery cathode compound Na4Ni7(PO4)6, have been investigated by physical property measurements and neutron powder diffraction. On cooling, ...Open AccessArticle -
Revisiting the cubic crystal structures of Sr4Nb2O9 and Sr5Nb2O10
Ling, Chris D; Kennedy, Brendan J; Wang, Chun-HaiPublished 2021We have synthesized polycrystalline and single crystal samples of Sr4Nb2O9 and Sr5Nb2O10 and revisited the crystal structure of the high-temperature cubic phase. By careful analysis of single-crystal X-ray diffraction ...Open AccessArticle -
Squeezing electrons out of 6s2 lone-pairs in perovskite-type oxides
Wang, Chun-Hai; Kayser, Paula; Kennedy, Brendan J; Maynard-Casely, H E; Gu, Qinfen; Ling, Chris DPublished 2019Having identified a set of conditions that predispose a solid-state ionic compound to a pressure-induced valence transition, we investigated a series of Bi(III) perovskite oxides. We found such a transition below 10 GPa ...Open AccessArticle -
Structure evolution of Na2O2 from room temperature to 500 oC
Ling, Chris D; Kennedy, Brendan J; Avdeev, Maxim; Wang, Chun-HaiPublished 2020Na2O2 is one of the possible discharge products from sodium-air batteries. Here we report the evolution of the structure of Na2O2 from room temperature to 500 oC using variable-temperature neutron and synchrotron X- ray ...Open AccessArticle -
YCa3(CrO)3(BO3)4: a Cr3+ kagomé lattice compound showing no magnetic order down to 2 K
Wang, Chun-Hai; Avdeev, Maxim; Kennedy, Brendan J; Kuepers, M; Ling, Chris DPublished 2016We report a new gaudefroyite-type compound YCa3(CrO)3(BO3)4, in which Cr3+ ions (3d3, S = 3/2) form an undistorted kagomé lattice. Using a flux agent, the synthesis was significantly accelerated with the typical calcining ...Open AccessArticle
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