New phases RCu5Sn (R=La, Ce, Pr, Nd, Sm, Gd) and Ce2Cu9Sn2.65
Abstract
Two new phases were identified in the copperrich region of the Ce–Cu–Sn system with composition CeCu5Sn and Ce2Cu9Sn2.65 and their crystal structures were determined by single crystal diffractometric data. CeCu5Sn, orthorhombic, space group Pnma, Pearson symbol oP28, a = 8.323(1) Å, b = 5.064(1) Å, c = 10.597(1) Å, Z = 4, R = 0.042 for 352 reflections with Fo > 4σ(Fo), is isotypic with CeCu5Au, a ternary derivative of the CeCu6, structure. Ce2Cu9Sn2.65, orthorhombic, space group Pnnm, Pearson symbol oP56-1.4, a = 10.669(1) Å, b = 16.734(2) Å, c = 5.066(1) Å, Z = 4, R = 0.040 for 906 reflections with Fo > 4σ(Fo), can be derived from the Ce2Cu9In3 type. Different from the parent structure, the copper and tin atoms occupy all the atomic sites in an ordered way, but a Sn position is only partially filled. The crystal structures of CeCu5Sn and Ce2Cu9Sn2.65 are closely related and show very similar coordination polyhedra. Isotypic phases were found in the series RCu5Sn with R = La, Pr, Nd, Sm, Gd. The crystal structure of the already known Ce3Cu4Sn4 (Gd3Cu4Ge4-type) was also refined from single crystal data.
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Articles in the same Issue
- Al13Os4-type monoclinic phase and its orthorhombic variant in the Al–Co alloy system
- Connecting icosahedral and dodecagonal order
- A warning in indexing triclinic powder diffraction data
- A lithium molybdenum(V) monophosphate, Li3(MoO)2(PO4)3 structurally related to Li2Na(MoO)2(PO4)3
- Crystal structure of a cubic Al70Pd23Mn6Si; a 2/1 rational approximant of an icosahedral phase
- The crystal chemistry of doyleite, Al(OH)3
- Single crystal Mössbauer and neutron powder diffraction measurements on the synthetic clinopyroxene Li-acmite LiFeSi2O6
- New phases RCu5Sn (R=La, Ce, Pr, Nd, Sm, Gd) and Ce2Cu9Sn2.65
- The crystal structure of 2,3-dihydro-2,2,4-trimethyl-1H-1,5-benzodiazepinium perchlorate
- Structure of (E)-6,7,8,9-tetradeoxy-1,2:3,4-di-O-isopropylidene-7-nitro-α-D-galacto-non-6-eno-1,5-pyranose
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