The ammonia‐water phase diagram and its implications for icy satellites | Zendy

Johnson Mary L. | Zendy; Nicol Malcolm | Zendy

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The ammonia‐water phase diagram and its implications for icy satellites

Author(s) -

Johnson Mary L.,

Nicol Malcolm

Publication year - 1987

Publication title -

journal of geophysical research: solid earth

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.67

H-Index - 298

eISSN - 2156-2202

pISSN - 0148-0227

DOI - 10.1029/jb092ib07p06339

Subject(s) - phase diagram , ammonia , titan (rocket family) , layering , phase (matter) , geology , enceladus , materials science , chemistry , analytical chemistry (journal) , mineralogy , astrobiology , environmental chemistry , physics , organic chemistry , botany , biology

We have used a Holzafpel‐type diamond anvil cell to determine the NH 3 ‐H 2 O phase diagram in the region from 0 to 33 mol % NH 3 , 240 to 370 K, and 0 to 5 GPa. The following phases were identified: liquid; water ices Ih, III, V, VI, VII, and VIII; ammonia monohydrate, NH 3 ·H 2 O; and ammonia dihydrate, NH 3 ·2H 2 O. Ammonia dihydrate becomes prominent at moderate pressures (less than 1 GPa), with planetologically significant implications, including the possibility of layering in Titan's magma ocean.

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