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Superstructure phase in the binary C 28 H 58 :C 36 H/D 74 system
Author(s) -
Chandra Lydon,
Buckley C. E.,
Connolly Joan,
Norén Lasse,
Lockhart Gordon,
Gilbert Elliot
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889806048217
Subject(s) - alkane , deuterium , superstructure , analytical chemistry (journal) , annealing (glass) , crystallography , protonation , phase (matter) , bragg peak , chemistry , scattering , x ray crystallography , materials science , diffraction , hydrocarbon , optics , physics , atomic physics , thermodynamics , ion , beam (structure) , organic chemistry , chromatography , composite material
Blends of the normal alkane C 28 H 58 with either protonated or deuterated C 36 alkane, x C 28 H 58 .(1 − x )C 36 H/D 74 , have been rapidly cooled from the melt and aged under ambient conditions for at least seven months. For compositions 0.94 ≥ x ≥ 0.65, both Bragg peaks and associated satellite peaks appear in the small‐angle X‐ray scattering. The Bragg peaks may be indexed to multiple order reflections from the average spacing of the chain lengths of the two components. The offset in q between these peaks is constant for each composition, but dependent on molar composition, and indicates that a superstructure phase forms on prolonged annealing. This new phase appears to be a solid solution and is found for both the protonated and deuterated samples, with a larger cell in the former system. For the remaining compositions, additional peaks indicate formation of a C 36 ‐rich phase.