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Apatite-type lanthanum silicates have been successfully prepared at room temperature by dry milling hexagonal A-La 2 O 3 and either amorphous or low cristobalite SiO 2 . Milling a stochiometric mixture of these chemicals in a planetary ball mill with a moderate rotating disc speed (350rpm), allows the formation of the target phase after only 3h although longer milling times...
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