English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse
  1. Start / 
  2. View item / 
  3. Item Summary

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Journal Article

K3NiO2 Revisited, Phase Transition and Crystal Structure Refinement

MPS-Authors
/persons/resource/persons280091

Jansen,  M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Djuris, K., Müller, U., & Jansen, M. (2012). K3NiO2 Revisited, Phase Transition and Crystal Structure Refinement. Zeitschrift für anorganische und allgemeine Chemie, 638(5), 737-743.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C2D0-B
Abstract
Single crystals as well as microcrystalline powders of K3NiO2 were obtained via the azide/nitrate route, starting from stoichiometric mixtures of KN3, KNO3 and NiO, at 923 K. According to temperature dependent X-ray investigations, K3NiO2 exhibits a phase transition at approx. 423 K. Single crystal X-ray analysis at 500 K has shown that the high temperature modification (beta-K3NiO2, tP12) crystallizes in P42/mnm (Z = 2, a = 6.0310(9), c = 7.156(1) angstrom, R1 = 0.037, R2 = 0.105). The ambient temperature modification (a-K3NiO2, tP24) was refined as a racemic twin (P41212/P43212; a = 6.012(4), c = 13.843(8) angstrom, R1 = 0.029, R2 = 0.070 at 100 K; a = 6.0300(9), c = 14.065(3) angstrom, R1 = 0.032, R2 = 0.082 at 298 K) yielding nearly equal volumes for both enantiomorphs. The structural relationship within the A3MX2 family is analyzed and displayed as a Barnighausen tree. The essential feature of the low and high temperature phases are isolated NiO23dumbbells, which are linked by potassium atoms to infinite chains.