Details

Autor(en) / Beteiligte

• Zou, Zhaoyong
• Habraken, Wouter J E M
• Matveeva, Galina
• Jensen, Anders C S
• Bertinetti, Luca
• Hood, Matthew A
• Sun, Chang-Yu
• Gilbert, Pupa U P A
• Polishchuk, Iryna
• Pokroy, Boaz
• Mahamid, Julia
• Politi, Yael
• Weiner, Steve
• Werner, Peter
• Bette, Sebastian
• Dinnebier, Robert
• Kolb, Ute
• Zolotoyabko, Emil
• Fratzl, Peter

Titel

A hydrated crystalline calcium carbonate phase: Calcium carbonate hemihydrate

Ist Teil von

• Science (American Association for the Advancement of Science), 2019-01, Vol.363 (6425), p.396-400

Ort / Verlag

United States: The American Association for the Advancement of Science

Erscheinungsjahr

2019

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• As one of the most abundant materials in the world, calcium carbonate, CaCO , is the main constituent of the skeletons and shells of various marine organisms. It is used in the cement industry and plays a crucial role in the global carbon cycle and formation of sedimentary rocks. For more than a century, only three polymorphs of pure CaCO -calcite, aragonite, and vaterite-were known to exist at ambient conditions, as well as two hydrated crystal phases, monohydrocalcite (CaCO ·1H O) and ikaite (CaCO ·6H O). While investigating the role of magnesium ions in crystallization pathways of amorphous calcium carbonate, we unexpectedly discovered an unknown crystalline phase, hemihydrate CaCO ·½H O, with monoclinic structure. This discovery may have important implications in biomineralization, geology, and industrial processes based on hydration of CaCO .