The system magnesium oxide-germanium dioxide

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ID: 294219
1959
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Abstract
The phase equilibrium diagram for the system MgO-GeO 2 has been determined by the quenching method. Three compounds are found in the system: MgO.GeO 2 , melting congruently at 1700+ or -20 degrees C; 2MgO.GeO 2 ; and 4MgO.GeO 2 , which dissociates at 1495+ or -1O degrees C, to 2MgO.GeO 2 and MgO. A region of 2-liquid immiscibility extends from 8 to 34 mole % of MgO. Optical and X-ray data are given for the compounds, including a new monoclinic polymorph of MgO.GeO 2 which is analogous to clinoenstatite (MgO.SiO 2 ). This polymorph, apparently stable above 1555 degrees C, inverts to the orthorhombic form (analogous to enstatite) with heating below that temperature. A protoenstatite phase was not observed, although a detailed study was not attempted. Important differences between the MgO-Geo 2 and MgO-SiO 2 systems are that no 4:1 silicate compound is known and that MgO.GeO 2 melts congruently at a much higher temperature than the incongruently melting metasilicate.
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openalex_W2075682155 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Carl R. Robbins, E. M. Levin
Journal american journal of science
Year 1959
DOI
10.2475/ajs.257.1.63
URL
https://doi.org/10.2475/ajs.257.1.63
Keywords Keywords not found

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