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Updated: Jun 12, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

NaNbOの極相 ((3)):粉末 difraktion,固体NMR,および第一原理計算による研究を組み合わせた

Karen E Johnston1, Chiu C Tang, Julia E Parker

  • 1School of Chemistry and EaStCHEM, University of St. Andrews, UK.

Journal of the American Chemical Society
|June 5, 2010
PubMed
まとめ

研究者らは,ソルゲル法を使用して,ニオバートナトリウム (NaNbO3) の新しい極相を合成した. この新段階は,既知のオーソロンビックポリモルフと共に特徴づけられ,固有のナトリウム部位と潜在的微妙な歪みを明らかにした.

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Other Nuclides: 31P, 19F, 15N NMR01:16

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.