English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Mössbauer experiments on a Li-acmite single crystal section with the crystallographic  b -axis ( P 2 1 / c ) parallel to the  k -vector of incident γ-rays were performed at room temperature and at several temperatures around the previously reported Néel point (19.5(5) K). The observed iron is found to be exclusively in the trivalent state on one crystallographic site. In the antiferromagnetic region below  T N   we observe strong relaxation effects which diminish with decreasing temperature. In spite of this, the Mossbauer spectra could be satisfactorily refined yielding a slightly temperature-dependent angle of ∼42° between the main component of the electric field gradient efg,  V zz  , and  b . In contradiction to early Mossbauer powder experiments, the quadrupole splitting  QS  does not disappear below  T N   – a recalculation of the latter spectra with our single crystal parameters ( QS  ≠ 0,  Θ  ≠ 0) yields at least equal goodness-of-fit as the early results. The internal magnetic field  H (0) is mainly aligned parallel to the  c -axis in agreement with previous susceptibility measurements. A slight canting towards  a  corresponds with the results of neutron powder diffraction measurements at low temperatures.

Single crystal Mössbauer and neutron powder diffraction measurements on the synthetic clinopyroxene Li-acmite LiFeSi 2 O 6