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Report No.

Formation and growth of image crystals by helium precipitation

Serizawa, Hiroyuki  ; Matsunaga, Junji*; Haga, Yoshinori   ; Nakajima, Kunihisa  ; Akabori, Mitsuo; Tsuru, Tomohito   ; Kaji, Yoshiyuki  ; Kashibe, Shinji*; Oishi, Yuji*; Yamanaka, Shinsuke*

Since the shape of the negative crystal closely relates to the morphology of the crystal habits, the formation and the growth mechanism is important subject in a field of the physical science. Whereas, the negative crystal formed in a large single crystal mass has been arousing interest as an expensive jewelry because of its mysterious appearance and rarity. However, it is difficult to control the shape of this polyhedral cavity embedded in a solid medium arbitrary. Here we report the recent discovery on the growth process of the negative crystal. We found that precipitated helium forms the negative crystal in UO$$_{2}$$; the shape changes drastically with the condition of the helium precipitation. The transformation mechanism was discussed in this article. Our investigation implies that the shape of the negative crystal can be arbitrary controlled by controlling the precipitation condition.



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Category:Chemistry, Multidisciplinary



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