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Bandiello E, Popescu C, da Silva EL, Sans JÁ, Errandonea D, Bettinelli M. PrVO 4 under High Pressure: Effects on Structural, Optical, and Electrical Properties. Inorg Chem 2020; 59:18325-18337. [PMID: 33291884 DOI: 10.1021/acs.inorgchem.0c02933] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In the pursuit of a systematic characterization of rare-earth vanadates under compression, in this work we present a multifaceted study of the phase behavior of zircon-type orthovanadate PrVO4 under high-pressure conditions, up to 24 GPa. We have found that PrVO4 undergoes a zircon to monazite transition at around 6 GPa, confirming previous results found by Raman experiments. A second transition takes place above 14 GPa, to a BaWO4-II type structure. The zircon to monazite structural sequence is an irreversible first-order transition, accompanied by a volume collapse of about 9.6%. The monazite phase is thus a metastable polymorph of PrVO4. The monazite-BaWO4-II transition is found instead to be reversible and occurs with a similar volume change. Here we report and discuss the axial and bulk compressibility of all phases. We also compare our results with those for other rare-earth orthovanadates. Finally, by means of optical-absorption experiments and resistivity measurements, we determined the effect of pressure on the electronic properties of PrVO4. We found that the zircon-monazite transition produces a collapse of the band gap and an abrupt decrease in the resistivity. The physical reasons for this behavior are discussed. Density functional theory simulations support our conclusions.
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Affiliation(s)
- Enrico Bandiello
- Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia, Spain
| | - Catalin Popescu
- CELLS-ALBA Synchrotron Light Facility, Cerdanyola del Valles, 08290 Barcelona, Spain
| | - Estelina Lora da Silva
- IFIMUP, Departamento de Física e Astronomia, Faculdade de Ciencias da Universidade do Porto, Porto, Portugal.,Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de València, 46022 València, Spain
| | - Juan Ángel Sans
- Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de València, 46022 València, Spain
| | - Daniel Errandonea
- Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia, Spain
| | - Marco Bettinelli
- Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
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Pereira ALDJ, Santamaría-Pérez D, Vilaplana R, Errandonea D, Popescu C, da Silva EL, Sans JA, Rodríguez-Carvajal J, Muñoz A, Rodríguez-Hernández P, Mujica A, Radescu SE, Beltrán A, Otero-de-la-Roza A, Nalin M, Mollar M, Manjón FJ. Experimental and Theoretical Study of SbPO 4 under Compression. Inorg Chem 2020; 59:287-307. [PMID: 31876414 DOI: 10.1021/acs.inorgchem.9b02268] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
SbPO4 is a complex monoclinic layered material characterized by a strong activity of the nonbonding lone electron pair (LEP) of Sb. The strong cation LEP leads to the formation of layers piled up along the a axis and linked by weak Sb-O electrostatic interactions. In fact, Sb has 4-fold coordination with O similarly to what occurs with the P-O coordination, despite the large difference in ionic radii and electronegativity between both elements. Here we report a joint experimental and theoretical study of the structural and vibrational properties of SbPO4 at high pressure. We show that SbPO4 is not only one of the most compressible phosphates but also one of the most compressible compounds of the ABO4 family. Moreover, it has a considerable anisotropic compression behavior, with the largest compression occurring along a direction close to the a axis and governed by the compression of the LEP and the weak interlayer Sb-O bonds. The strong compression along the a axis leads to a subtle modification of the monoclinic crystal structure above 3 GPa, leading from a 2D to a 3D material. Moreover, the onset of a reversible pressure-induced phase transition is observed above 9 GPa, which is completed above 20 GPa. We propose that the high-pressure phase is a triclinic distortion of the original monoclinic phase. The understanding of the compression mechanism of SbPO4 can aid to improve the ion intercalation and catalytic properties of this layered compound.
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Affiliation(s)
- André Luis de Jesus Pereira
- Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team , Universitat Politècnica de València , València , Spain.,Grupo de Pesquisa de Materiais Fotonicos e Energia Renovável-MaFER , Universidade Federal da Grande Dourados , Dourados , Mato Grosso do Sul , Brazil
| | - David Santamaría-Pérez
- Departament de Física Aplicada-ICMUV, MALTA Consolider Team , Universitat de València , Burjassot , Spain
| | - Rosário Vilaplana
- Centro de Tecnologías Físicas, MALTA Consolider Team , Universitat Politecnica de València , València 46022 , Spain
| | - Daniel Errandonea
- Departament de Física Aplicada-ICMUV, MALTA Consolider Team , Universitat de València , Burjassot , Spain
| | - Catalin Popescu
- CELLS-ALBA Synchrotron Light Facility , 08290 Cerdanyola, Barcelona , Spain
| | - Estelina Lora da Silva
- Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team , Universitat Politècnica de València , València , Spain
| | - Juan Angel Sans
- Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team , Universitat Politècnica de València , València , Spain
| | | | - Alfonso Muñoz
- Departamento de Física, Instituto de Materiales y Nanotecnología, MALTA Consolider Team , Universidad de La Laguna , Tenerife , Spain
| | - Plácida Rodríguez-Hernández
- Departamento de Física, Instituto de Materiales y Nanotecnología, MALTA Consolider Team , Universidad de La Laguna , Tenerife , Spain
| | - Andres Mujica
- Departamento de Física, Instituto de Materiales y Nanotecnología, MALTA Consolider Team , Universidad de La Laguna , Tenerife , Spain
| | - Silvana Elena Radescu
- Departamento de Física, Instituto de Materiales y Nanotecnología, MALTA Consolider Team , Universidad de La Laguna , Tenerife , Spain
| | - Armando Beltrán
- Departament de Química Física i Analítica, MALTA Consolider Team , Universitat Jaume I , Castelló , Spain
| | - Alberto Otero-de-la-Roza
- Departamento de Química Física y Analítica, MALTA Consolider Team , Universidad de Oviedo , 33006 Oviedo , Spain
| | - Marcelo Nalin
- Instituto de Quimica, Departamento de Química Geral e Inorgânica , UNESP-Campus de Araraquara , São Paulo , Brazil
| | - Miguel Mollar
- Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team , Universitat Politècnica de València , València , Spain
| | - Francisco Javier Manjón
- Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team , Universitat Politècnica de València , València , Spain
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