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Related Experiment Videos

X-ray diffraction study of K3NdSi7O17: a new framework silicate with a linear Si-O-Si bond.

S M Haile1, B J Wuensch

  • 1Materials Science, California Institute of Technology, Pasadena, CA 91125, USA. smhaile@caltech.edu

Acta Crystallographica. Section B, Structural Science
|September 28, 2000
PubMed
Summary

Researchers discovered a new silicate compound, tripotassium neodymium heptasilicate (K(3)NdSi(7)O(17)), during a search for fast-ion conductors. This novel material exhibits a unique crystal structure with a 180-degree Si-O-Si bond angle.

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Area of Science:

  • Solid State Chemistry
  • Crystallography
  • Materials Science

Background:

  • Exploration of the K(2)O-Nd(2)O(3)-SiO(2) system is crucial for discovering new materials.
  • Fast-ion conductors (FICs) are essential for advanced energy storage applications.

Purpose of the Study:

  • To synthesize and characterize novel compounds within the high-silica region of the K(2)O-Nd(2)O(3)-SiO(2) system.
  • To identify potential new fast-ion conductors (FICs).

Main Methods:

  • Hydrothermal synthesis was employed to investigate the K(2)O-Nd(2)O(3)-SiO(2) system.
  • Single-crystal X-ray diffraction was used to determine the crystal structure of the new compound.

Main Results:

  • A new compound, tripotassium neodymium heptasilicate (K(3)NdSi(7)O(17)), was successfully synthesized.

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  • The crystal structure was solved using single-crystal X-ray methods, revealing crystallization in space group P3 with specific lattice constants.
  • The structure features an interrupted silicate framework with Nd octahedra and K polyhedra, and an unusual 180-degree Si-O-Si bond angle.

    • Conclusions:

    • Tripotassium neodymium heptasilicate (K(3)NdSi(7)O(17)) is a novel compound with a unique structural motif.
    • The discovery of K(3)NdSi(7)O(17) expands the known structural diversity of silicates.
    • No known isomorphs of K(3)NdSi(7)O(17) exist, highlighting its uniqueness.