Magnetic properties in α-MnO₂ doped with alkaline elements

Scientific Reports
Li-Ting TsengJiabao Yi

Abstract

α-MnO2 nanotubes were fabricated using a hydrothermal technique. Li, Na and K ions were introduced into MnO2 nanotubes to tailor their magnetic properties. It was found that with a doping concentration lower than 12 at%, the nanotubes showed ferromagnetic-like ordering at low temperature (<50 K), while antiferromagnetic coupling dominated their physical behavior with doping concentrations beyond 12 at%. Such experimental phenomenon was in very good agreement with associated first principle calculations. The ferromagnetic-like ordering originates from the breaking of equivalence between two different Mn-O octahedrals in α-MnO2 due to the filling of alkaline ions in the tunnels. Both small charge transfer and lattice distortion play important roles in the ferromagnetic ordering.

References

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Feb 4, 2009·Nano Letters·Arava Leela Mohana ReddyPulickel M Ajayan
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Citations

Mar 22, 2016·ACS Applied Materials & Interfaces·Ruichao PengLin Zhuang
May 23, 2017·Nanomaterials·Lina Sanchez-BoteroJuan P Hinestroza
Jan 18, 2017·Physical Chemistry Chemical Physics : PCCP·G KruthikaP Murugan
Nov 22, 2016·Nature Communications·Yifei YuanReza Shahbazian-Yassar
Nov 18, 2017·Nanomaterials·Christian M Julien, Alain Mauger
Mar 19, 2019·Angewandte Chemie·Zhifei HaoSihui Zhan
Aug 11, 2017·Journal of the American Chemical Society·Elena WillingerMarc Georg Willinger

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Methods Mentioned

BETA
X-ray
Transmission electron microscopy
scanning

Software Mentioned

Vienna ab initio simulation package

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