Thermal expansivity of Ge{sub 1-y}Sn{sub y} alloys

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.81.245214· OSTI ID:21386747

Roucka, R; Fang, Y -Y; Kouvetakis, J; Chizmeshya, A V. G. ^[1]; Menendez, J ^[2]

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1. Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604 (United States)
2. Department of Physics, Arizona State University, Tempe, Arizona 85287-1504 (United States)

The temperature dependence of the lattice parameter of Ge{sub 1-y}Sn{sub y} alloys deposited on Si substrates has been determined from an analysis of their x-ray reciprocal-space maps. It is found that over the range 0<y<0.03 the alloy thermal expansivity increases by up to 20% as a function of y. This implies a strong deviation from a linear interpolation between the end compounds since the thermal expansivities of pure Ge and {alpha}-Sn are nearly the same. Alternative interpolation formulas based on a Debye model and a mixed Debye-Einstein model of the phonon structure are tested and it is found that they also fail to explain the observed increase in thermal expansivity.

• OSTI ID: 21386747
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 81, Issue 24; Other Information: DOI: 10.1103/PhysRevB.81.245214; (c) 2010 The American Physical Society; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BINARY ALLOY SYSTEMS
GERMANIUM ALLOYS
INTERPOLATION
LATTICE PARAMETERS
PHONONS
SUBSTRATES
TEMPERATURE DEPENDENCE
TIN ALLOYS
X RADIATION
ALLOY SYSTEMS
ALLOYS
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MATHEMATICAL SOLUTIONS
NUMERICAL SOLUTION
QUASI PARTICLES
RADIATIONS