R3: High-pressure science and deep Earth’s material

[R3-10] Structure of sodium silicate aqueous solution under high pressure

*Tomoko Sato¹, Fumiya Noritake², Akane Yamamoto¹, Satoru Urakawa⁴, Daisuke Wakabayashi³, Nobumasa Funamori³ (1. Hiroshima Univ., 2. Yamanashi Univ., 3. KEK, 4. Okayama Univ.)

Keywords:sodium silicate water glass, second end critical point

We performed high-pressure in-situ X-ray scattering experiments and force-field MD simulations in order to reveal the detailed structure of sodium silicate aqueous solution. A low-Q peak at around Q=0.6Å^-1 was observed in X-ray scattering patterns. MD simulations suggest that sodium clusters are the origin of the low-Q peak.