New n = 3 Dion-Jacobson phases NaLn2Ti2NbO10·xH2O (Ln = La, Pr, Nd, Sm)

Young Sik Hong, Keon Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The n = 3 Dion-Jacobson phases, NaLn2Ti2NbO10·xH2O (Ln = La, Pr, Nd, Sm), have been prepared by the ion-exchange reaction of CsLn2Ti2NbO10. Their crystal structures were determined by the Rietveld analysis of powder X-ray diffraction patterns, and they were found to keep the new-type ordering sequence of (Ti1/2Nb1/2)O6-TiO6- (Ti1/2Nb1/2)O6 in the tripled BO6 octahedra. The interlayer Na cations and H2O molecules were proposed for the first time to be situated at the 8g and 4e sites in the space group I4/mmm, forming face-shared octahedra along the (110) direction. Upon firing, they were dehydrated into new intermediate hydrates with P4/mmm symmetry at around 100°C, and then NaLn2Ti2NbO10 with I4/mmm symmetry at above 200°C.

Original languageEnglish
Pages (from-to)1325-1334
Number of pages10
JournalMaterials Research Bulletin
Volume36
Issue number7-8
DOIs
Publication statusPublished - 2001 May 6

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Rietveld analysis
Hydrates
Diffraction patterns
Cations
Ion exchange
Crystal structure
Positive ions
Powders
X rays
Molecules
symmetry
hydrates
interlayers
diffraction patterns
cations
crystal structure
molecules
ions
x rays
Direction compound

Keywords

  • A. Layered compounds
  • A. Oxides
  • C. TGA
  • C. X-ray diffraction
  • D. Crystal structure

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

New n = 3 Dion-Jacobson phases NaLn2Ti2NbO10·xH2O (Ln = La, Pr, Nd, Sm). / Hong, Young Sik; Kim, Keon.

In: Materials Research Bulletin, Vol. 36, No. 7-8, 06.05.2001, p. 1325-1334.

Research output: Contribution to journalArticle

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N2 - The n = 3 Dion-Jacobson phases, NaLn2Ti2NbO10·xH2O (Ln = La, Pr, Nd, Sm), have been prepared by the ion-exchange reaction of CsLn2Ti2NbO10. Their crystal structures were determined by the Rietveld analysis of powder X-ray diffraction patterns, and they were found to keep the new-type ordering sequence of (Ti1/2Nb1/2)O6-TiO6- (Ti1/2Nb1/2)O6 in the tripled BO6 octahedra. The interlayer Na cations and H2O molecules were proposed for the first time to be situated at the 8g and 4e sites in the space group I4/mmm, forming face-shared octahedra along the (110) direction. Upon firing, they were dehydrated into new intermediate hydrates with P4/mmm symmetry at around 100°C, and then NaLn2Ti2NbO10 with I4/mmm symmetry at above 200°C.

AB - The n = 3 Dion-Jacobson phases, NaLn2Ti2NbO10·xH2O (Ln = La, Pr, Nd, Sm), have been prepared by the ion-exchange reaction of CsLn2Ti2NbO10. Their crystal structures were determined by the Rietveld analysis of powder X-ray diffraction patterns, and they were found to keep the new-type ordering sequence of (Ti1/2Nb1/2)O6-TiO6- (Ti1/2Nb1/2)O6 in the tripled BO6 octahedra. The interlayer Na cations and H2O molecules were proposed for the first time to be situated at the 8g and 4e sites in the space group I4/mmm, forming face-shared octahedra along the (110) direction. Upon firing, they were dehydrated into new intermediate hydrates with P4/mmm symmetry at around 100°C, and then NaLn2Ti2NbO10 with I4/mmm symmetry at above 200°C.

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