Browsing NTNU Open by Author "Schmitz, F.D."

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Atomic resolution imaging of beryl: an investigation of the nano-channel occupation

Van Helvoort, Antonius; Holst, Bodil; Schmitz, F.D.; Arivazhagan, V.; Vullum, Per Erik (Journal article; Peer reviewed, 2016)

Beryl in different varieties (emerald, aquamarine, heliodor etc.) displays a wide range of colours that have fascinated humans throughout history. Beryl is a hexagonal cyclo-silicate (ring-silicate) with channels going ...
Atomic resolution transmission electron microscopy visualisation of channel occupancy in beryl in different crystallographic directions

Hanser, C. S.; Vullum, Per Erik; Van Helvoort, Antonius; Schmitz, F.D.; Häger, Tobias; Botcharnikov, R; Holst, Bodil (Journal article; Peer reviewed, 2024)

The causes of colour in beryl have been a research topic for decades. For some varieties, such as emerald (green, coloured by Cr3+ and/or V3+), the main cause of colour is substitutions by metal atoms within the framework. ...