منابع مشابه
Twinned caesium cerium(IV) pentafluoride
Single-crystals of CsCeF5 were synthesized hydro-thermally. The crystal under investigation was twinned by pseudo-merohedry with a twofold rotation around the c axis as an additional twinning operation. The crystal structure is built of layers of distorted edge- and corner-sharing CeF8 square-anti-prisms. The Cs(+) cations are located between the layers and exhibit coordination numbers of nine....
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We extend the principal curves algorithm by creating twinned principal curves which extend through two related data sets simultaneously. The criteria for accepting a pair of data points as neighbours for any other pair of data points is that each of the relevant points must be close in the appropriate space. We illustrate the algorithm’s predictive power on arti-cial data sets before using it t...
متن کاملThe Photoeleci-ron Spectrum of Phosphorus Pentafluoride
Phosphorus pentafluoride plays an important role in phosphorus chemistry for both stereochemical and theoretic31 reasons. Several semi-empiricnl moleculnr orbital calculations have been carried out on PF, [l-5] in an effort to elucidate its electronic structure. However, reference to table 1 indicates a generally unsatisfactory agreement between these calculations regarding both the sequencing ...
متن کاملCaesium diuranium hexatelluride
Single crystals of CsU(2)Te(6) were synthesized from the reaction of U, Te, and Cs(2)Te(3) at 1273 K. CsU(2)Te(6) crystallizes in the space group Cmcm in the CsTh(2)Te(6) structure type. The asymmetric unit comprises one U (site symmetry m2m), one Cs (m2m; half-occupancy) and two Te atoms (m.. and m2m). The structure of CsU(2)Te(6) consists of infinite [U(2)Te(6)] layers perpendicular to [010] ...
متن کاملElastic deformation of twinned microstructures
Many crystalline materials exhibit twinned microstructures, where well-defined orientation relationships define the special symmetry between different, elastically anisotropic twin variants. When such twins are subjected to external loading, additional internal stresses necessarily occur at the twin boundaries in order to maintain compatibility. These compatibility stresses are constant inside ...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section E Structure Reports Online
سال: 2014
ISSN: 1600-5368
DOI: 10.1107/s1600536814003286