THE CRYSTAL STRUCTURE OF BARIUM TETRASULFIDE MONOHYDRATE

Abstract

Barium tetrasulfide monohydrate forms strongly piezoelectric crystals belonging to the orthorhombic system, space group D to the 3rd power sub 2 - P2 sub1 2 sub1 2 with 4 molecules in the unit cell of dimensions a = 9.67, b = 7. 99, and c = 7.81 A. The crystals structure was completely determined, and the values of the 17 atomic coordinates were refined by double Fourier series and least-square methods, based upon 296 terms derived from visual intensity measurements, in the 3 principal zones. The Ba atom is completely ionized, and is in ionic contact with the S atoms and the O of the H sub2 O molecule. The terasulfide ion possesses C sub2 symmetry. Like the anion of Cs sub2 S sub6 the tetrasulfide ion is nonbranched and nonplanar, and also exhibits a similar alternation in bond length. Two kinds of S-S bonds are present, of length 2.02 and 2.07 A, allowing a new tentative bond-order vs bond-length curve for S to be established.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1953
Accession Number
AD0017743

Entities

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  • S. C. Abrahams

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  • Massachusetts Institute of Technology

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  • Air Platforms
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DTIC Thesaurus Topics

  • Absorption Coefficients
  • Atoms
  • Cameras
  • Chemical Analysis
  • Crystal Structure
  • Crystallography
  • Crystals
  • Diffraction
  • Dihedral Angle
  • Electron Density
  • Electrons
  • Fourier Series
  • Intensity
  • Massachusetts
  • Molecules
  • Radiation
  • Standards

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  • Chemistry

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