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Structure and magnetism of a new hexagonal polymorph of Ba3Tb(BO3)3 with a quasi-2D triangular lattice

Accepted version
Peer-reviewed

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Type

Article

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Authors

Kelly, ND 
Dutton, SE 

Abstract

This article reports the structural and magnetic characterisation of a new hexagonal (P63cm) low-temperature phase of Ba3Tb(BO3)3, isostructural with the heavier lanthanide borates with formula Ba3Ln(BO3)3 (Ln = Dy-Lu). The crystal structure contains a quasi-two-dimensional (2D) triangular lattice of Tb3+ ions and is predicted to display unusual magnetic behaviour as a result of the low dimensionality. Magnetic susceptibility χ(T) shows antiferromagnetic interactions (θCW=−7.15 K) and no sharp ordering transition at T≥2 K, but analysis of χ′(T), isothermal magnetisation and heat capacity suggests the possibility of short-range ordering at T≈10 K. The material exhibits an inverse magnetocaloric effect at T<4 K.

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Keywords

Lanthanide, Borate, Magnetism, Triangular lattice, Two-dimensional

Journal Title

Journal of Solid State Chemistry

Conference Name

Journal ISSN

0022-4596
1095-726X

Volume Title

292

Publisher

Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/M000524/1)
EPSRC (2124516)
EPSRC Strategic Equipment Grant EP/M000524/1
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