High-pressure Raman scattering of MgMoO4 |
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| Affiliation: | 1. Departamento de Física, Universidade Federal do Ceará, P.O. Box 6030, Fortaleza, CE 60455-900, Brazil;2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2, Poland;3. Departamento de Física, Universidade Federal do Piauí, Teresina, PI 64049-550, Brazil;4. Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Quixadá, CE 63900-000, Brazil;5. Faculdade de Física, Universidade Federal do Pará, P.O. Box 479, Belém, PA 66075-110, Brazil;6. Departamento de Física, Universidade Federal de São Carlos, São Carlos, SP 13565-905, Brazil;1. LSQM, Laboratory of Chemical Synthesis of Materials, Department of Materials Engineering, Federal University of Rio Grande do Norte, UFRN, P.O. Box 1524, Natal, RN, Brazil;2. Department of Engineering Sciences and Mathematics Luleå University of Technology, SE-97187, Luleå, Sweden;3. Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de València, València, Spain;4. Departamento de Física Aplicada-ICMUV, Universidad de Valencia, MALTA Consolider Team, Edificio de Investigación, C. Dr. Moliner 50, 46100, Burjassot, Spain;1. Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, South Korea;2. Department of Materials Engineering, Kyonggi University, Suwon 16227, South Korea;1. Departamento de Física, Campus Ministro Petrônio Portella, Universidade Federal do Piauí, CEP 64.049-550, Teresina, PI, Brazil;2. Departamento de Física, Universidade Federal do Ceará, P. O. Box 6030, CEP 60.455-970, Fortaleza, CE, Brazil;3. Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.900-000, Quixadá, CE, Brazil;1. School of Physics and Electronic Engineering, Linyi University, Linyi, 276005, PR China;2. State Key Lab of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, PR China;1. Institute of Atomic and Molecular Physics, Sichuan University, 610065 Chengdu, China;2. Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, 610065 Chengdu, China;3. Institute of Photonics & Optoelectronics, Department of Electrical Engineering, National Taiwan University, Taipei 106-17, Taiwan |
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| Abstract: | In this paper, we present results of high-pressure Raman scattering studies in β-MgMoO4 from atmospheric to 8.5 GPa. The experiments were carried out using methanol–ethanol as pressure medium. By analyzing the pressure dependence of the Raman data (change in the number of lattice modes, splitting of bands and wavenumber discontinuities) we were able to observe a phase transition undergone by the β-MgMoO4 at 1.4 GPa, which is only completed at ∼5 GPa. The transition was observed to be irreversible and the modifications in the Raman spectra were attributed to the changes in coordination of Mo ions from tetrahedral to octahedral. The transition possibly changes the original C2/m symmetry to C2/m or to P2/c. Implication on the phase transition for similar molybdate structures, such as α-MnMoO4, is also highlighted. |
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| Keywords: | High pressure Molybdate Raman scattering Phase transition |
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