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

Young Sik Hong; Keon Kim

doi:10.1016/S0025-5408(01)00617-1

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

Young Sik Hong, Keon Kim

* Honorary professors

Research output: Contribution to journal › Article › peer-review

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 (Ti_1/2Nb_1/2)O₆-TiO₆- (Ti_1/2Nb_1/2)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 language	English
Pages (from-to)	1325-1334
Number of pages	10
Journal	Materials Research Bulletin
Volume	36
Issue number	7-8
DOIs	https://doi.org/10.1016/S0025-5408(01)00617-1
Publication status	Published - 2001 May 6

Bibliographical note

Funding Information:
We gratefully acknowledge the financial support for this work by the Ministry of Education & human resources development (BK21).

Keywords

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

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/S0025-5408(01)00617-1

Cite this

@article{2079f1888ef94954817ea520db25da4f,

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

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.",

keywords = "A. Layered compounds, A. Oxides, C. TGA, C. X-ray diffraction, D. Crystal structure",

author = "Hong, {Young Sik} and Keon Kim",

note = "Funding Information: We gratefully acknowledge the financial support for this work by the Ministry of Education & human resources development (BK21).",

year = "2001",

month = may,

day = "6",

doi = "10.1016/S0025-5408(01)00617-1",

language = "English",

volume = "36",

pages = "1325--1334",

journal = "Materials Research Bulletin",

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T1 - New n = 3 Dion-Jacobson phases NaLn2Ti2NbO10·xH2O (Ln = La, Pr, Nd, Sm)

AU - Hong, Young Sik

AU - Kim, Keon

N1 - Funding Information: We gratefully acknowledge the financial support for this work by the Ministry of Education & human resources development (BK21).

PY - 2001/5/6

Y1 - 2001/5/6

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.

KW - A. Layered compounds

KW - A. Oxides

KW - C. TGA

KW - C. X-ray diffraction

KW - D. Crystal structure

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