Using neutron diffraction technique we measure the average density of the heavy water confined in a nanoporous silica matrix, MCMR-41, over the pressure-temperature plane. The result suggest the existence of a line of liquid-liquid phase transition with its end point at 1.3 +- 0.3 kbar and 213 +- 3 K. This point is the liquid-liquid critical point (LLCP) according to the "liquid-liquid critical point" scenario. The phase diagram of the deeply cooled confined heavy water is discussed.
neutron diffraction, liquid-liquid critical point, confined water phase diagram, high density liquid phase transition
, Ito, K.
, Leao, J.
, Harriger, L.
, Liu, Y.
and Chen, S.
Liquid-Liquid Phase Transition and Its Phase Diagram in Deeply-Cooled Heavy Water Confined in Nanoporous Silica Matrix, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917922
(Accessed December 9, 2023)