New spinelloid phases in the MgGa204-Mg2Ge04 and MgFe204-Mg2Ge04 systems
published: Mar 21, 1989
ArtNo. ESP147050101007, Price: 29.00 €
Abstract The spinelloid phase Mg3Ga2GeO(III), stable at 1 atm in the MgGa2O4-Mg2GeO4 system, has been found to transform under high P,T conditions (60-65 kbar, 1,200 °C) into other members of the spinelloid family, namely, Mg3Ga2GeO8(V) and Mg3Ga2GeO8(spinel) which have been characterized by powder X-ray diffraction and high-resolution electron microscopy. These results extend the structural analogy existing between the MgGa2O4-Mg2GeO4 and NiAl2O4-Ni2SiO4 systems, the former being a lower-presssure analog of the later. A new room-pressure spinelloid phase, Mg3Fe2GeO8(III), has also been synthesized and characterized by powder X-ray diffraction.