Structural characterization of new layered perovskites MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0)

Young Sik Hong, Chi Hwan Han, Keon Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The crystal structures of n = 3 Dion-Jacobson phases MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0) have been investigated by the Rietveld analysis of their powder XRD patterns. These compounds show the new-type ordering sequence of (Ti1/2 Ta1/2) O6-TiO6-(Ti1/2Ta1/2)O6 in the tripled octahedra, corresponding to the niobium analogs of MLa2Ti2NbO10. They crystallize in the tetragonal system P4/mmm with lattice constants of a = 3.84733(9) and c = 15.4364(4) Å for CsLa2Ti2TaO10, and a = 3.8342(2) and c = 15.2776(9) Å for RbLa2Ti2TaO10. Sodium-exchanged phase was easily hydrated to NaLa2Ti2TaO10 · 2H2O, belonging to the space group I4/mmm with a = 3.8399(3) and c = 34.288(3) Å. Upon firing, NaLa2Ti2TaO10 · 2H2O was dehydrated to NaLa2Ti2TaO10 · 0.9H2O with P4/mmm at around 100°C and then NaLa2Ti2TaO10 with I4/mmm at above 200°C. The Na cations in two hydrates were surrounded with six oxygens, forming face-shared octahedra along (110) direction. These structural models, especially for the coordination environment of Na cations, were proposed for the first time.

Original languageEnglish
Pages (from-to)290-298
Number of pages9
JournalJournal of Solid State Chemistry
Volume158
Issue number2
DOIs
Publication statusPublished - 2001 Oct 10

Fingerprint

perovskites
Cations
Positive ions
Niobium
Rietveld analysis
cations
Hydrates
niobium
hydrates
Powders
Lattice constants
Crystal structure
Sodium
sodium
analogs
Oxygen
crystal structure
oxygen
Direction compound

Keywords

  • Dion-Jacobson phase
  • Hydrate
  • Layered perovskite
  • Ordering

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Structural characterization of new layered perovskites MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0). / Hong, Young Sik; Han, Chi Hwan; Kim, Keon.

In: Journal of Solid State Chemistry, Vol. 158, No. 2, 10.10.2001, p. 290-298.

Research output: Contribution to journalArticle

@article{50709a8aa9d44d9da00532b3b4a6aa29,
title = "Structural characterization of new layered perovskites MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0)",
abstract = "The crystal structures of n = 3 Dion-Jacobson phases MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0) have been investigated by the Rietveld analysis of their powder XRD patterns. These compounds show the new-type ordering sequence of (Ti1/2 Ta1/2) O6-TiO6-(Ti1/2Ta1/2)O6 in the tripled octahedra, corresponding to the niobium analogs of MLa2Ti2NbO10. They crystallize in the tetragonal system P4/mmm with lattice constants of a = 3.84733(9) and c = 15.4364(4) {\AA} for CsLa2Ti2TaO10, and a = 3.8342(2) and c = 15.2776(9) {\AA} for RbLa2Ti2TaO10. Sodium-exchanged phase was easily hydrated to NaLa2Ti2TaO10 · 2H2O, belonging to the space group I4/mmm with a = 3.8399(3) and c = 34.288(3) {\AA}. Upon firing, NaLa2Ti2TaO10 · 2H2O was dehydrated to NaLa2Ti2TaO10 · 0.9H2O with P4/mmm at around 100°C and then NaLa2Ti2TaO10 with I4/mmm at above 200°C. The Na cations in two hydrates were surrounded with six oxygens, forming face-shared octahedra along (110) direction. These structural models, especially for the coordination environment of Na cations, were proposed for the first time.",
keywords = "Dion-Jacobson phase, Hydrate, Layered perovskite, Ordering",
author = "Hong, {Young Sik} and Han, {Chi Hwan} and Keon Kim",
year = "2001",
month = "10",
day = "10",
doi = "10.1006/jssc.2001.9109",
language = "English",
volume = "158",
pages = "290--298",
journal = "Journal of Solid State Chemistry",
issn = "0022-4596",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Structural characterization of new layered perovskites MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0)

AU - Hong, Young Sik

AU - Han, Chi Hwan

AU - Kim, Keon

PY - 2001/10/10

Y1 - 2001/10/10

N2 - The crystal structures of n = 3 Dion-Jacobson phases MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0) have been investigated by the Rietveld analysis of their powder XRD patterns. These compounds show the new-type ordering sequence of (Ti1/2 Ta1/2) O6-TiO6-(Ti1/2Ta1/2)O6 in the tripled octahedra, corresponding to the niobium analogs of MLa2Ti2NbO10. They crystallize in the tetragonal system P4/mmm with lattice constants of a = 3.84733(9) and c = 15.4364(4) Å for CsLa2Ti2TaO10, and a = 3.8342(2) and c = 15.2776(9) Å for RbLa2Ti2TaO10. Sodium-exchanged phase was easily hydrated to NaLa2Ti2TaO10 · 2H2O, belonging to the space group I4/mmm with a = 3.8399(3) and c = 34.288(3) Å. Upon firing, NaLa2Ti2TaO10 · 2H2O was dehydrated to NaLa2Ti2TaO10 · 0.9H2O with P4/mmm at around 100°C and then NaLa2Ti2TaO10 with I4/mmm at above 200°C. The Na cations in two hydrates were surrounded with six oxygens, forming face-shared octahedra along (110) direction. These structural models, especially for the coordination environment of Na cations, were proposed for the first time.

AB - The crystal structures of n = 3 Dion-Jacobson phases MLa2Ti2TaO10 (M = Cs, Rb) and NaLa2Ti2TaO10 · xH2O (x = 2, 0.9, 0) have been investigated by the Rietveld analysis of their powder XRD patterns. These compounds show the new-type ordering sequence of (Ti1/2 Ta1/2) O6-TiO6-(Ti1/2Ta1/2)O6 in the tripled octahedra, corresponding to the niobium analogs of MLa2Ti2NbO10. They crystallize in the tetragonal system P4/mmm with lattice constants of a = 3.84733(9) and c = 15.4364(4) Å for CsLa2Ti2TaO10, and a = 3.8342(2) and c = 15.2776(9) Å for RbLa2Ti2TaO10. Sodium-exchanged phase was easily hydrated to NaLa2Ti2TaO10 · 2H2O, belonging to the space group I4/mmm with a = 3.8399(3) and c = 34.288(3) Å. Upon firing, NaLa2Ti2TaO10 · 2H2O was dehydrated to NaLa2Ti2TaO10 · 0.9H2O with P4/mmm at around 100°C and then NaLa2Ti2TaO10 with I4/mmm at above 200°C. The Na cations in two hydrates were surrounded with six oxygens, forming face-shared octahedra along (110) direction. These structural models, especially for the coordination environment of Na cations, were proposed for the first time.

KW - Dion-Jacobson phase

KW - Hydrate

KW - Layered perovskite

KW - Ordering

UR - http://www.scopus.com/inward/record.url?scp=0034811937&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034811937&partnerID=8YFLogxK

U2 - 10.1006/jssc.2001.9109

DO - 10.1006/jssc.2001.9109

M3 - Article

AN - SCOPUS:0034811937

VL - 158

SP - 290

EP - 298

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

IS - 2

ER -