Synthesis strategies toward improved ordering of [MnO6] octahedra in tunnel structured 2 × 3 and 2 × 4 MnO2

Synthesis strategies toward improved ordering of [MnO6] octahedra in tunnel structured 2 × 3 and 2 × 4 MnO2
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改善隧道结构 2 × 3 和 2 × 4 MnO2 中 [MnO6] 八面体有序性的合成策略

DOI:
10.1016/j.scriptamat.2020.113713
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发表时间:
2021
期刊:
影响因子:
6
通讯作者:
Pomerantseva, Ekaterina
Pomerantseva, Ekaterina
中科院分区:
材料科学1区
文献类型:
--
作者:
Andris, Ryan;Ridley, Phillip;Byles, Bryan W.;Cullen, David A.;More, Karren L.;Pomerantseva, Ekaterina

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通过确定和控制关键的合成参数,提高了Na稳定的2×3和2×4 MnO 2结构中隧道尺寸的均匀性。通过水钠锰矿(Na-birnessite)的水热处理,制备了2×3和2×4 MnO 2隧道锰氧化物纳米线。在此,通过X射线衍射图案和扫描透射电子显微镜图像的组合分析揭示了[MnO 6]八面体的改进的有序性。我们表明,钠水钠锰矿前体的结晶度和水热处理过程中系统的化学组成对于实现具有足够均匀性的结构隧道的目标尺寸至关重要。
Improved homogeneity of tunnel size in Na-stabilized 2×3 and 2×4 MnO2structures was achieved by identifying and controlling critical synthesis parameters. 2×3 and 2×4 MnO2tunnel manganese oxide nanowires were obtained by hydrothermal treatment of Na-birnessite, a layered manganese oxide that undergoes a layer-to-tunnel transition under high pressure and temperature. Herein, the improved ordering of [MnO6] octahedra is revealed via a combined analysis of X-ray diffraction patterns and scanning transmission electron microscopy images. We show that crystallinity of the Na-birnessite precursor and the chemical composition of the system during hydrothermal treatment are crucial for achieving the targeted size of the structural tunnels with adequate uniformity.
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