Influence of Cation Size on the Local Atomic Structure and Electronic Properties of Ta Perovskite OxynitridesClick to copy article linkArticle link copied!
- Xin WangXin WangDepartment of Materials Science and Engineering and Joint Institute of Advanced Materials, University of Tennessee, Knoxville, Tennessee 37996, United StatesMore by Xin Wang
- Bo JiangBo JiangNeutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United StatesMore by Bo Jiang
- Yuanpeng ZhangYuanpeng ZhangNeutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United StatesMore by Yuanpeng Zhang
- Young-Il KimYoung-Il KimDepartment of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of KoreaMore by Young-Il Kim
- Katharine Page*Katharine Page*Email: [email protected]Department of Materials Science and Engineering and Joint Institute of Advanced Materials, University of Tennessee, Knoxville, Tennessee 37996, United StatesNeutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United StatesShull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United StatesMore by Katharine Page
Abstract
Partial anion substitution in transition metal oxides provides rich opportunities to control and tune physical and chemical properties, for example, combining the merits of oxides and nitrides. In addition, the possibility of resulting anion sublattice order provides a means to target polar and chiral structures based on a wide array of accessible structural archetypes by design. Here, we investigate the local structures of a family of perovskite tantalum oxynitrides—ATaO2N (A = Ba, Sr, and Ca)—using a combination of experimental and theoretical approaches including neutron total scattering, density functional theory (DFT), and ab initio molecular dynamics (AIMD) simulations. We present the first experimental study of chemical short-range order (CSRO) in CaTaO2N, confirming local cis N ordering of the anion sub-lattice. Our systematic exploration of a local structure across the A cation size series (from the larger Ba to the smaller Ca) reveals a perovskite motif increasingly distorted with respect to long-range average structures. DFT and AIMD simulations support the observed trends. Overall, structures with cis ordering of the nitrogen anions in each TaO4N2 octahedron are favored over those with trans ordering. With diminishing A cation size, local cis ordering and Ta off-centering play decreasing roles in overall lattice stability, overshadowed by the stabilizing effects of octahedral tilting. The influence of these factors on local dipole formation and frustrated dipole ordering are discussed.
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- Young-Il Kim, Maxim Avdeev. Synthesis, Structural Distortion, and Magnetic Property of Complex Perovskites Amn0.2m0.8o2.6n0.4 (a = Sr, Ba; M = Nb, Ta). SSRN Electronic Journal 2022, 31 https://doi.org/10.2139/ssrn.4197065
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