Polymorphism of Gd{sub 5}Si{sub 2}Ge{sub 2}: The equivalence of temperature, magnetic field, and chemical and hydrostatic pressures

Journal Article · Sun May 01 00:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.71.174104· OSTI ID:20718989

Mudryk, Ya ^[1]; Lee, Y; Vogt, T ^[2]; Gschneidner, Jr, K A; Pecharsky, V K ^[1]

---

1. Materials and Engineering Physics Program, Ames Laboratory, Iowa State University, Ames, Iowa 50011-3020 (United States)
2. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

The atomic scale details of the pressure-induced polymorphism of Gd{sub 5}Si{sub 2}Ge{sub 2} have been established by in situ x-ray powder diffraction. At room temperature, the monoclinic Gd{sub 5}Si{sub 2}Ge{sub 2} phase ({beta}) is transformed to the orthorhombic {alpha}-Gd{sub 5}Si{sub 2}Ge{sub 2}, observed previously as the low temperature, high magnetic field, or high silicon content polymorph. The transition occurs between {approx}10 kbar and {approx}20 kbar. Diffraction data provide the missing link in order to achieve a more complete understanding of how a structural change in a material can be induced by a variety of thermodynamic variables.

• OSTI ID: 20718989
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 71, Issue 17; Other Information: DOI: 10.1103/PhysRevB.71.174104; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
GADOLINIUM ALLOYS
GERMANIUM ALLOYS
HYDROSTATICS
MAGNETIC FIELDS
MONOCLINIC LATTICES
PHASE TRANSFORMATIONS
SILICON
SILICON ALLOYS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
X-RAY DIFFRACTION