Ternary erbium chromium sulfides : structural relationships and magnetic properties


Autoria(s): Vaqueiro, Paz; Szkoda, Iwona; Sanchez, Rodolfo D.; Powell, Anthony V.
Data(s)

16/02/2009

Resumo

Single crystals of four erbium-chromium sulfides have been grown by chemical vapor transport using iodine as the transporting agent. Single-crystal X-ray diffraction reveals that in Er(3)CrS(6) octahedral sites are occupied exclusively by Cr(3+) cations, leading to one-dimensional CrS(4)(5-) chains of edge-sharing octahedra, while in Er(2)CrS(4), Er(3+), and Cr(2+) cations occupy the available octahedral sites in an ordered manner. By contrast, in Er(6)Cr(2)S(11) and Er(4)CrS(7), Er(3+) and Cr(2+) ions are disordered over the octahedral sites. In Er(2)CrS(4), Er(6)Cr(2)S(11), and Er(4)CrS(7), the network of octahedra generates an anionic framework constructed from M(2)S(5) slabs of varying thickness, linked by one-dimensional octahedral chains. This suggests that these three phases belong to a series in which the anionic framework may be described by the general formula [M(2n+1)S(4n+3)](x-), with charge balancing provided by Er(3+) cations located in sites of high-coordination number within one-dimensional channels defined by the framework. Er(4)CrS(7), Er(6)Cr(2)S(11), and Er(2)CrS(4) may thus be considered as the n = 1, 2, and infinity members of this series. While Er(4)CrS(7) is paramagnetic, successive magnetic transitions associated with ordering of the chromium and erbium sub-lattices are observed on cooling Er(3)CrS(6) (T(C)(Cr) = 30 K; T(C)(Er) = 11 K) and Er(2)CrS(4) (T(N)(Cr) = 42 K, T(N)(Er) = 10 K) whereas Er(6)Cr(2)S(11) exhibits ordering of the chromium sub-lattice only (T(N) = 11.4 K).

Formato

text

Identificador

http://centaur.reading.ac.uk/32494/2/Inorg%20Chem%202009%20avp.pdf

Vaqueiro, P. <http://centaur.reading.ac.uk/view/creators/90005590.html>, Szkoda, I., Sanchez, R. D. and Powell, A. V. <http://centaur.reading.ac.uk/view/creators/90005265.html> (2009) Ternary erbium chromium sulfides : structural relationships and magnetic properties. Inorganic Chemistry, 48 (4). pp. 1284-1292. ISSN 0020-1669 doi: 10.1021/ic801482a <http://dx.doi.org/10.1021/ic801482a>

Idioma(s)

en

Publicador

American Chemical Society

Relação

http://centaur.reading.ac.uk/32494/

creatorInternal Vaqueiro, Paz

creatorInternal Powell, Anthony V.

10.1021/ic801482a

Tipo

Article

PeerReviewed