[76] in their synthesis of Fe-ludwigite with a Fe molar fraction of 25% (i.e., f = 25%). Marincea [56] obtained temperatures around 600–650 ◦C for ludwigite formation in the Ocna de Fier deposit, Romania. Later, Bloise and Barrese [77] reported equivalent temperatures experi- ...
The Ca/P molar ratio was 1.69, which was close to 1.67 for hydroxyapatite, indicating certain apatite-forming ability. Metals 2017, 7, 105 Metals 2017, 7, 105 9 of 12 9 of 12 Metals 2017, 7, 105 10 of 12 HPO OH → PO H O. (5) The...