Zinc-lead ordering in equiatomic rare earth plumbides REZnPb (RE=La–Nd and Sm–Tb)
Author:
Heletta Lukas1, Pöttgen Rainer1
Affiliation:
1. Institut für Anorganische und Analytische Chemie , Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
Abstract
Abstract
The plumbides REZnPb (RE=rare earth metals La–Nd and Sm–Tb) were synthesized by induction melting of the elements in sealed niobium ampoules. The samples were characterized by X-ray powder diffraction. The structures of the praseodymium and neodymium compound were refined from single-crystal X-ray diffractometer data: YPtAs type, P63/mmc, a=461.32(8), c=1658.00(3) pm, wR2=0.0588, 267 F
2 values, 12 variables for PrZnPb and a=460.12(3), c=1642.7(1), wR2=0.0617, 243 F
2 values, 12 variables for NdZnPb. The plumbides with RE=La, Ce, Sm, Gd and Tb are isotypic while the Zintl phase EuZnPb crystallizes with the orthorhombic TiNiSi type, Pnma, a=796.6(2), b=482.53(9), c=822.9(2) pm. The zinc and lead atoms build up polyanionic networks: slightly puckered Zn3Pb3 layers in AA′BB′ stacking sequence in the YPtAs type plumbides and a three-dimensional [ZnPb]2− network with distorted tetrahedral ZnPb4/4 coordination in EuZnSn. The different crystal structures are a consequence of the valence electron count, i.e. 18 for EuZnSn and 19 for the hexagonal plumbides. The crystal chemical details and bonding peculiarities are discussed.
Publisher
Walter de Gruyter GmbH
Subject
General Chemistry
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2 articles.
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