The crystal structures of m,o-Ce₃Pt₄Sn₆ and Ce_1-xPt₆Al_13+2x

Author(s)

Werner Paschinger, Kunio Yubuta, Yuta Saiga, Toshiro Takabatake, Gerald Giester, Peter Rogl

Abstract

The crystal structures of two novel ternary compounds, Ce

₃Pt

₄Sn

₆ and Ce

_1-xPt

₆Al

_13+2x (x = 0.207), have been derived by direct methods from X-ray single crystal data. Whereas Ce

_1-xPt

₆Al

_13+2x is of a new structure type (a = 1.42224(2) nm, c = 0.87367(1) nm, space group P6¯2m), Ce

₃Pt

₄Sn

₆ was found to crystallize in two different crystal modifications, (i) a monoclinic variant (a = 0.93682(2) nm, b = 0.46145(1) nm, c = 1.40434(3) nm, β = 99.635(1)°, space group P2

₁/m), which is isotypic with the Y

₃Pt

₄Ge

₆-type and (ii) an orthorhombic modification (a = 2.76394(4) nm, b = 0.460588(7) nm, c = 0.93530(1) nm, space group Pnma), which crystallizes with the ordered Pr

₃Pt

₄Ge

₆-type. For the monoclinic arrangement m-Ce

₃Pt

₄Sn

₆ an intrinsically defect growth pattern was found - it grows in two related motifs (opposite directions of pentagonal units) in the ratio of 90%: 10% ensuring a stoichiometric composition. TEM observation directly revealed intrinsic building defects detected by single crystal X-ray diffraction for m-Ce

₃Pt

₄Sn

₆. Diffuse streaks in electron diffraction and inhomogeneous contrasts in a high resolution TEM image indicate the existence of a random stacking sequence between two related motifs.

Organisation(s)

Department of Materials Chemistry, Department of Mineralogy and Crystallography, Department of Physical Chemistry

External organisation(s)

Tohoku University, Hiroshima University

Journal

Solid State Sciences

Volume

55

Pages

48-57

No. of pages

10

ISSN

1293-2558

DOI

https://doi.org/10.1016/j.solidstatesciences.2016.02.005

Publication date

02-2016

Peer reviewed

Yes

Austrian Fields of Science 2012

104003 Inorganic chemistry, 104017 Physical chemistry, 105113 Crystallography

Keywords

ASJC Scopus subject areas

Condensed Matter Physics, Chemistry(all), Materials Science(all)

Portal url

https://ucrisportal.univie.ac.at/en/publications/the-crystal-structures-of-moce3pt4sn6-and-ce1xpt6al132x(c8ac1924-33a4-44a0-8e1f-14d70f341303).html