A new polymorph of Ln polysulfides (Ln = Pr and Nd)

Journal Article · Tue Apr 01 00:00:00 EST 1986 · Mater. Res. Bull.; (United States)

DOI:https://doi.org/10.1016/0025-5408(86)90001-2· OSTI ID:5633414

Yanagisawa, Y; Kume, S

A new polymorph of rare earth polysulfides was synthesized under high temperature-pressure conditions. Its X-ray diffraction patterns were indexed on an orthorhombic unit cell with the lattice constants of a = 0.8025, b = 1.6152 and c = 0.4062 for PrS/sub 2/ and a = 0.7977, b = 1.6012 and c = 0.4027 nm, for NdS/sub 2/. The calculated densities of the orthorhombic polysulfides are nearly the same as those of the allotropic phases with monoclinic symmetry. To compare the stability of the two polymorphs, the Madelung energies of the structures were calculated and that of the monoclinic phase, which is synthesized without applying pressures, was found to be lower than that of the orthorhombic phase.

• Research Organization: Dept. of Physics, Nara Univ. of Education, Nara 630
• OSTI ID: 5633414
• Journal Information: Mater. Res. Bull.; (United States), Vol. 21:4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NEODYMIUM SULFIDES
CHEMICAL PREPARATION
PRASEODYMIUM SULFIDES
ALLOTROPY
CRYSTAL LATTICES
DENSITY
LAYERS
PRESSURE DEPENDENCE
STABILITY
SYMMETRY
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
NEODYMIUM COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
360601* - Other Materials- Preparation & Manufacture