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Preparation, Crystal Structure, and Physical Properties of the Rare‐Earth Metal Palladium Silicides LnPdSi (Ln = La, Ce, Pr) and the a‐ThSi 2 Type Compounds LaPd 0.787(2) Si 1.213(2) and CePd 0.758(5) Si 1.242(5)
Author(s) -
Prots' Yurii M.,
Jeitschko Wolfgang,
Gerdes Martin,
Künnen Bernd
Publication year - 1998
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(1998110)624:11<1855::aid-zaac1855>3.0.co;2-0
Subject(s) - palladium , crystallography , silicon , crystal structure , materials science , silicide , paramagnetism , metal , monoclinic crystal system , chemistry , metallurgy , condensed matter physics , physics , catalysis , biochemistry
The equiatomic rare‐earth metal palladium silicides Ln PdSi ( Ln = La, Ce, Pr) crystallize with a new monoclinic structure type, which was determined from singlecrystal X‐ray data of PrPdSi: P 2 1 / c , a = 1079.1(5) pm, b = 584.1(2) pm, c = 786.7(2) pm, β = 92.00(2)°, Z = 8. The palladium and silicon atoms form a three‐dimensionally infinite network, where the palladium atoms have three silicon neighbors, while one kind of silicon atoms is coordinated to four palladium atoms and the other kind to one silicon and two palladium atoms. The bond lengths Pd–Si (from 242.8 to 255.3 pm) and Si–Si (233.0 pm) are similar to those of corresponding two‐electron bonds. The praseodymium atoms are coordinated by 12 silicon and palladium atoms. One Pr–Pr distance is surprisingly short with 347.5 pm. LaPdSi is a metallic conductor and Pauli paramagnetic, while CePdSi and PrPdSi show Curie‐Weiss behavior with magnetic moments typical for Ce +3 and Pr +3 and ferro‐ or ferrimagnetic order below 7 K. The compounds LaPd 0.787(2) Si 1.213(2) and CePd 0.758(5) Si 1.242(5) crystallize with α‐ThSi 2 type structure. Their composition was determined by structure refinements from single‐crystal X‐ray data.