Ordering and stability of Pb/sub 1-//sub x/Eu/sub x/Te alloys

Journal Article · Mon Feb 29 23:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.339933· OSTI ID:5490388

Salamanca-Young, L; Partin, D L; Heremans, J

We have observed two kinds of ordering in Pb/sub 1-//sub x/Eu/sub x/Te alloys using transmission electron microscopy. One kind of ordering corresponds to long wavelength periodicities of approx.18 A that are observed for xapprox.0.4--0.51 along the <110> and <111> directions. This ordering is similar to that of spinodal decomposition observed in metallic alloys and is explained by a composition as well as interplanar spacing modulation. We have also obtained electron diffraction patterns from these alloys that show weak diffraction spots with reciprocal lattice vectors that are not allowed for the PbTe structure. The observation of these extra spots can be explained by assuming that the Pb/sub 1-//sub x/Eu/sub x/Te alloy forms an ordered compound or superlattice with lattice constants that are multiples of the lattice constants of PbTe. We also present models for the structure of these superlattices.

• Research Organization: Physics Department, General Motors Research Laboratories, Warren, Michigan 48090-9055
• OSTI ID: 5490388
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 63:5; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
EUROPIUM COMPOUNDS
EUROPIUM TELLURIDES
FABRICATION
LATTICE PARAMETERS
LEAD COMPOUNDS
LEAD TELLURIDES
MICROSCOPY
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
RARE EARTH COMPOUNDS
SCATTERING
STABILITY
SUPERLATTICES
TELLURIDES
TELLURIUM COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY