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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The phase transformation of red  β -Cu 2 HgI 4  to the black  α -phase at 67°C has been studied by X-ray powder diffraction. It is suggested that copper and iodine occupy the same tetrahedral positions in the  α - and  β -phases, whereas mercury is statistically distributed over two crystallographic positions in the  α -phase. Both phases may be described in space group  I [unk]2 m . The phase transition has been studied by X-ray powder diffraction at elevated temperatures and disintegration of the  α -phase may occasionally be found. The structure of the  α -phase at 85°C was determined and refined by Rietveld full-profile technique to a Bragg  R -factor = 0.064.

Crystal structure and phase transition of α -Cu 2 HgI 4