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Report No.
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Innovative study on negative crystal formed in oxide

Serizawa, Hiroyuki  ; Haga, Yoshinori   ; Machida, Masahiko  ; Nakamura, Hiroki  ; Yamanaka, Shinsuke*; Oishi, Yuji*

Because the shape of a negative crystal is closely related to the morphology of the crystal structure, its formation and growth mechanism is an important subject in the physical sciences. In addition, negative crystals formed in a large single-crystal mass have attracted interest as expensive jewellery because of their mysterious appearance and rarity. However, it is difficult to arbitrarily control the shapes of these polyhedral cavities embedded in a solid medium. Here, we report a discovery on the negative crystal growth process. We found that precipitated helium forms a negative crystal in UO$$_{2}$$; the shape changes dramatically with the conditions of helium precipitation. This article discusses the shape transformation mechanism. Our investigation implies that the shapes of negative crystals can be arbitrarily controlled by controlling the precipitation conditions.

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