Anti-isostructural phases and anomalous thermoelasticity in In-based alloys: Synchrotron x-ray diffraction experiments and unified phenomenological model

A combined in situ high-temperature high-pressure synchrotron radiation diffraction study has been carried out on In alloys with Cd, Pb, and Sn. Anti-isostructural phase transitions between structures with opposite signs of tetragonal distortion, found earlier in In-Pb, have also been observed in In-Sn alloys. We show that negative thermal expansion of In and some of the In alloys is a phase-dependent effect resulting from a competition between spontaneous strain induced by a proper ferroelastic transformation and normal thermal expansion. A unified phenomenological model has been worked out for structural phase transitions in In and its alloys. © 2007 The American Physical Society.

[1]  I. Bdikin,et al.  Electron concentration and phase stability in binary alloys in–pb and hg–sn under high pressure , 2004 .

[2]  G. Stein,et al.  A metal cluster generator for gas‐phase electron diffraction and its application to bismuth, lead, and indium: Variation in microcrystal structure with size , 1978 .

[3]  V. Lorman,et al.  REVIEWS OF TOPICAL PROBLEMS: Methods of the theory of singularities in the phenomenology of phase transitions , 1991 .

[4]  V. Degtyareva,et al.  Simple metals at high pressures: the Fermi sphere–Brillouin zone interaction model , 2006 .

[5]  Johansson,et al.  Gallium and indium under high pressure , 2000, Physical review letters.

[6]  A. P. Hammersley,et al.  Two-dimensional detector software: From real detector to idealised image or two-theta scan , 1996 .

[7]  W. Holzapfel,et al.  Face-centred cubic to tetragonal transitions in In alloys under high pressure , 2001 .

[8]  L. Landau,et al.  The Theory of Phase Transitions , 1936, Nature.

[9]  Schulte,et al.  Effect of pressure on atomic volume and crystal structure of indium to 67 GPa. , 1993, Physical review. B, Condensed matter.

[10]  Takemura.  Effect of pressure on the lattice distortion of indium to 56 GPa. , 1991, Physical review. B, Condensed matter.

[11]  J. Goodenough.  A Theory of the Deviation from Close Packing in Hexagonal Metal Crystals , 1953 .

[12]  Juan Rodríguez-Carvajal,et al.  Recent advances in magnetic structure determination by neutron powder diffraction , 1993 .

[13]  W. B. Pearson,et al.  A handbook of lattice spacings and structures of metals and alloys , 1958 .

[14]  B. Johansson,et al.  Fluctuating lattice constants of indium under high pressure. , 2004, Physical review letters.

[15]  Anisotropic thermal expansion of indium , 1969 .

[16]  B. Johansson,et al.  Electron-concentration and pressure-induced structural changes in the alloys In 1-x Xx (X=Cd,Sn) , 2005 .

[17]  Pierre Villars,et al.  Pearson's handbook of crystallographic data for intermetallic phases , 1985 .

[18]  T. Tadaki,et al.  Structure and displacive phase transformations of small particles of In-Pb alloys , 2001 .

[19]  I. Bdikin,et al.  Phase transition in a tetragonal In90Pb10 alloy under high pressure: a switch from c/a > 1 to c/a < 1 , 2003 .

[20]  W. Holzapfel,et al.  Phase transitions under high pressure in binary Sn alloys (with In, Hg and Ga) , 2002 .