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 SM ISO690:2012ERRANDONEA, Daniel J.H., KUMAR, Ravhi, MANJON, Francisco Javier, URSACHI, Veaceslav, RUSU, Emil. Post-spinel transformations and equation of state in ZnGa2O 4: Determination at high pressure by in situ x-ray diffraction. In: Physical Review B - Condensed Matter and Materials Physics, 2009, vol. 79, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.79.024103 |
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 Physical Review B - Condensed Matter and Materials Physics |
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| Volumul 79 / 2009 / ISSN 1098-0121 /ISSNe 1550-235X | |
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| DOI:https://doi.org/10.1103/PhysRevB.79.024103 | |
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Room-temperature angle-dispersive x-ray diffraction measurements on spinel ZnGa2 O4 up to 56 GPa show evidence of two structural phase transformations. At 31.2 GPa, ZnGa2 O4 undergoes a transition from the cubic spinel structure to a tetragonal spinel structure similar to that of ZnMn2 O4. At 55 GPa, a second transition to the orthorhombic marokite structure (CaMn2 O4 -type) takes place. The equation of state of cubic spinel ZnGa2 O4 is determined: V0 =580.1 (9) Å3, B0 =233 (8) GPa, B0′ =8.3 (4), and B0″ =-0.1145 GPa-1 (implied value); showing that ZnGa2 O4 is one of the less compressible spinels studied to date. For the tetragonal structure an equation of state is also determined: V0 =287.8 (9) Å3, B0 =257 (11) GPa, B0′ =7.5 (6), and B0″ =-0.0764 GPa-1 (implied value). The reported structural sequence coincides with that found in NiMn2 O4 and MgMn2 O4. |
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| Cuvinte-cheie magnesium, Hercynite, Closure Temperature |
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