Post-spinel transformations and equation of state in ZnGa2O 4: Determination at high pressure by in situ x-ray diffraction

Errandonea Daniel J.H.; Kumar Ravhi; Manjon Francisco Javier; Ursaki Veaceslav; Rusu Emil

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SM ISO690:2012

ERRANDONEA, Daniel J.H., KUMAR, Ravhi, MANJON, Francisco Javier, URSAKI, 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

Volumul 79 / 2009 / ISSN 1098-0121 /ISSNe 1550-235X

Post-spinel transformations and equation of state in ZnGa₂O ₄: Determination at high pressure by in situ x-ray diffraction

DOI:https://doi.org/10.1103/PhysRevB.79.024103

Pag. 0-0

Errandonea Daniel J.H.¹, Kumar Ravhi², Manjon Francisco Javier³, Ursaki Veaceslav⁴, Rusu Emil⁴

¹ Departamento de Física Aplicada—ICMUV, Universitat de València,
² University of Nevada, Las Vegas,
³ Universitat Politècnica de València,
⁴ Institute of Applied Physics, Academy of Sciences of Moldova

Disponibil în IBN: 23 iunie 2023

Rezumat

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.

Cuvinte-cheie
magnesium, Hercynite, Closure Temperature

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<title xml:lang='en'>Post-spinel transformations and equation of state in ZnGa2O 4: Determination at high pressure by in situ x-ray diffraction</title>
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<publicationYear>2009</publicationYear>
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<subject>magnesium</subject>
<subject>Hercynite</subject>
<subject>Closure Temperature</subject>
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<description xml:lang='en' descriptionType='Abstract'><p>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) &Aring;3, B0 =233 (8) GPa, B0&prime; =8.3 (4), and B0&Prime; =-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) &Aring;3, B0 =257 (11) GPa, B0&prime; =7.5 (6), and B0&Prime; =-0.0764 GPa-1 (implied value). The reported structural sequence coincides with that found in NiMn2 O4 and MgMn2 O4.&nbsp;</p></description>
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