Magnetic structures and phase transitions of nickel-bromine boracite Ni3B7O13Br. A neutron powder diffraction study

Mao, Shao Yu; Kubel, Frank; Schmid, Hans; Schobinger, Penelope; Fischer, Peter

doi:10.1080/00150199308008529

Scientific article

English

Magnetic structures and phase transitions of nickel-bromine boracite Ni₃B₇O₁₃Br. A neutron powder diffraction study

Contributors

Mao, Shao Yu; Kubel, Frank; Schmid, Hans; Schobinger, Penelope; Fischer, Peter

Published in

Ferroelectrics, vol. 146, no. 1-4, p. 81-97

Publication date

1993

Abstract

The nuclear crystal structure and the magnetic ordering of the two ferroelectric/weakly ferromagnetic phases of Nickel-Bromine boracite with the Shubnikov groups of Pc'a21' (30-21K) and P1 (<21K)-postulated previously from magnetoelectric and optical data-were studied by neutron powder diffraction. The neutron spectra confirm the onset of magnetic ordering at 30 K but do not resolve the transition to the triclinic symmetry. The observed neutron intensities of the orthorhombic and triclinic phase, collected at 24 K and 8 K, respectively, were interpreted in terms of the magnetic space group Pc'a21' by an essentially antiferromagnetic ordering of the nickel ion moments. The magnetic structure refinements allowed to distinguish two different types of the magnetically ordered nickel ions among the three inequivalent nickel sites. Two possible magnetic structure models and a potential frustration phenomenon during spin ordering are discussed.

Keywords

Boracite
Neutron diffraction
Magnetic structure
Ferroelectric
Ferromagnetic
Ferroelastic

UNIGE affiliation entities

Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

Funding

Swiss National Science Foundation - 1992

Citation (ISO format)

MAO, Shao Yu et al. Magnetic structures and phase transitions of nickel-bromine boracite Ni₃B₇O₁₃Br. A neutron powder diffraction study. In: Ferroelectrics, 1993, vol. 146, n° 1-4, p. 81–97. doi: 10.1080/00150199308008529

Article (Published version)

Identifiers

PID : unige:31359
DOI : 10.1080/00150199308008529

Journal ISSN

0015-0193

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