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Related Experiment Videos

Na3Ca2TaO6, a rock-salt superstructure phase with a fully ordered cation arrangement

Yamane1, Takahashi, Kajiwara

  • 1Institute for Advanced Materials Processing, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan. yamane@ibis.iamp.tohoku.ac. jp.

Acta Crystallographica. Section C, Crystal Structure Communications
|October 12, 2000
PubMed
Summary

Trisodium dicalcium tantalum hexaoxide, a novel quaternary oxide, exhibits an ordered rock-salt crystal structure. This cation-ordered superstructure features sodium, calcium, and tantalum atoms arranged in specific octahedral sites.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Quaternary oxides are complex materials with diverse applications.
  • Understanding crystal structures is crucial for predicting material properties.
  • Rock-salt phases and their ordered variants are of significant interest in materials science.

Purpose of the Study:

  • To characterize the crystal structure of trisodium dicalcium tantalum hexaoxide.
  • To determine if this compound is isostructural with known ordered rock-salt phases.
  • To elucidate the atomic arrangement within the cation-ordered superstructure.

Main Methods:

  • Crystallographic analysis
  • Powder X-ray diffraction (PXRD)
  • Single-crystal X-ray diffraction (SCXRD)

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Main Results:

  • Trisodium dicalcium tantalum hexaoxide was identified as a quaternary oxide.
  • The compound is isostructural with Li(3)Ni(2)TaO(6), a partially ordered rock-salt phase.
  • Na, Ca, and Ta atoms occupy specific octahedral sites, forming a cation-ordered superstructure.

Conclusions:

  • The crystal structure of trisodium dicalcium tantalum hexaoxide has been determined.
  • The compound adopts an ordered arrangement of cations within an octahedral framework.
  • This ordered superstructure provides insights into the formation and properties of related complex oxides.