NMR studies of structure and ferroelectricity for Rochelle salt nanoparticles embedded in mesoporoussieves

Cheng Tien, E. V. Charnaya, Min-Kai Lee, S. V. Baryshnikov, D. Michel, W. Böhlmann

研究成果: Article同行評審

29 引文 斯高帕斯(Scopus)

摘要

NMR studies were carried out for Rochelle salt embedded in molecular sieves. 23Na magic angle spinning (MAS) and multiple quantum (MQ) MAS NMR spectra revealed a complex structure of the confined crystalline material. The major part of particles within nanopores had a structure similar to that of bulk Rochelle salt. The 23Na spin-lattice relaxation times at various temperatures associated with this modification were also similar to those for bulk Rochelle salt and showed broad minima that corresponded to the ferroelectric and re-entrant phase transitions under nanoconfinement at temperatures just below the relevant transitions in bulk. This result suggests that the bulk-like modification within pores is ferroelectric in between. Fast spin relaxation in the rest of the confined material reflected high molecular mobility.

原文English
文章編號215205
期刊Journal of Physics Condensed Matter
20
發行號21
DOIs
出版狀態Published - 2008 十二月 1

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學
  • 材料科學(全部)

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