宇宙における強誘電体の氷について; 中性子回折実験で存在提唱

Space glaciology; Study suggests ferroelectric ice in the Universe

深澤 裕; 荒川 雅

Fukazawa, Hiroshi; Arakawa, Masashi

本発表では、低温高圧下で生じるさまざまな氷の状態について考察し、冥王星等で実現する100K以下で真空から数十GPaの圧力で生じる氷の相転移,氷天体の内部構造等(特に冥王星の表面から内部に存在する強誘電体の氷の分布)について仔細を述べる。

We do experiments on ice prepared at much higher pressure conditions. We aim to observe the ferroelectric ice and hydrogen-ordered structures below 130 K using the WAND. We try to observe the phase transition from disordered phases to the ferroelectric ice or other ordered phases around 40130 K (The value is the same as the temperature of Pluto's surface and inner). The experiment will reveal the whole picture of low-temperature ice structures. In this symposium we report recent results at the HFIR and our future plan using higher intensity neutron beam.