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Instruments / Technical Area	Publication Details	Published	Actions
I15-Extreme Conditions	Pressure-induced amorphization of YVO4:Eu3+ nanoboxes J. Ruiz Fuertes , O. Gomis , S. Leon Luis , N. Schrodt , F. J. Manjon , S. Ray , D. Santamaria Perez , J. A. Sans Tresserras , H. M. Ortiz , D. Errandonea , C. Ferrer-Roca , A. Segura , D. Martinez Garcia , V. Lavin , U. R. Rodríguez-Mendoza , A Muñoz Nanotechnology 27 DOI: 10.1088/0957-4484/27/2/025701 Diamond Proposal Number(s): [3652, 6517] Show Abstract ▼ Abstract: A structural transformation from the zircon-type structure to an amorphous phase has been found in YVO4:Eu3+ nanoboxes at high pressures above 12.7 GPa by means of x-ray diffraction measurements. However, the pair distribution function of the high-pressure phase shows that the local structure of the amorphous phase is similar to the scheelite-type YVO4. These results are confirmed both by Raman spectroscopy and Eu3+ photoluminescence which detect the phase transition to a scheelite-type structure at 10.1 and 9.1 GPa, respectively. The irreversibility of the phase transition is observed with the three techniques after a maximum pressure in the upstroke of around 20 GPa. The existence of two 5D0 $\to $ 7F0 photoluminescence peaks confirms the existence of two local environments for Eu3+, at least for the low-pressure phase. One environment is the expected for substituting Y3+ and the other is likely a disordered environment possibly found at the surface of the nanoboxes.	Nov 2015
I15-Extreme Conditions	High-pressure x-ray diffraction and ab initio study of Ni2Mo3N, Pd2Mo3N, Pt2Mo3N, Co3Mo3N, and Fe3Mo3N: Two families of ultra-incompressible bimetallic interstitial nitrides D. Errandonea , Ch. Ferrer-Roca , D. Martínez-Garcia , A. Segura , O. Gomis , A. Muñoz , P. Rodríguez-Hernández , J. López-Solano , S. Alconchel , F. Sapiña Physical Review B DOI: 10.1103/PhysRevB.82.174105 Diamond Proposal Number(s): [3652] Show Abstract ▼ Abstract: We have studied by means of high-pressure x-ray diffraction the structural stability of Ni2Mo3N, Co3Mo3N, and Fe3Mo3N. We also report ab initio computing modeling of the high-pressure properties of these compounds, Pd2Mo3N and Pt2Mo3N. We have found that the nitrides remain stable in the ambient-pressure cubic structure at least up to 50 GPa and determined their equation of state. All of them have a bulk modulus larger than 300 GPa. Single-crystal elastic constants have been calculated in order to quantify the stiffness of the investigated nitrides. We found that they should have a Vickers hardness similar to that of cubic spinel nitrides such as γ-Si3N4.	Nov 2010

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