Pressure-induced permanent metallization with reversible structural transition in molybdenum disulfide

Zhuang, Yongyong; Dai, Lidong; Wu, Lei; Li, Heping; Hu, Haiying; Liu, KaiXiang; Yang, Lingxiao; Pu, Chang

doi:10.1063/1.4979143

Cited by 53 publications

(94 citation statements)

References 44 publications

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“…We then loaded powder ε-FeOOH in a diamond anvil cell (DAC) with Ne as the pressure medium. A second piece of ε-FeOOH from the same source was loaded without any pressure medium to check the effect of anisotropic compression [28]. The sample chamber was built by drilling a 100 to 120 µm hole in a tungsten gasket, which was squeezed between two diamond anvils with a 260 µm culet.…”

Section: Methodsmentioning

confidence: 99%

Experimental Evidence for Partially Dehydrogenated ε-FeOOH

et al. 2019

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Hydrogen in hydrous minerals becomes highly mobile as it approaches the geotherm of the lower mantle. Its diffusion and transportation behaviors under high pressure are important in order to understand the crystallographic properties of hydrous minerals. However, they are difficult to characterize due to the limit of weak X-ray signals from hydrogen. In this study, we measured the volume changes of hydrous ε-FeOOH under quasi-hydrostatic and non-hydrostatic conditions. Its equation of states was set as the cap line to compare with ε-FeOOH reheated and decompression from the higher pressure pyrite-FeO 2 Hx phase with 0 < x < 1. We found the volumes of those re-crystallized ε-FeOOH were generally 2.2% to 2.7% lower than fully hydrogenated ε-FeOOH. Our observations indicated that ε-FeOOH transformed from pyrite-FeO 2 Hx may inherit the hydrogen loss that occurred at the pyrite-phase. Hydrous minerals with partial dehydrogenation like ε-FeOOHx may bring it to a shallower depth (e.g., < 1700 km) of the lower mantle.

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Section: Methodsmentioning

confidence: 99%

Experimental Evidence for Partially Dehydrogenated ε-FeOOH

et al. 2019

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“…The plate electrode was integrated into both diamond anvils. A low temperature was obtained by liquid nitrogen and an experimental temperature was measured by a k-type thermocouple with an estimated accuracy of 5 K. Detailed descriptions of the high-pressure experimental procedures and measurement methods can be found elsewhere [14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

“…As usual, the pressure-induced structural phase transition, metallization, and amorphization are accompanied by the variation of electrical transport characteristics for some engineering materials [14][15][16][17][18]. To the best of our knowledge, only one high-pressure electrical resistivity experiment on the synthetic rutile with various Ni-doped concentrations was reported under a limited pressure range by using a Bridgman opposed anvil setup [19].…”

Section: Introductionmentioning

confidence: 99%

Structural Phase Transition and Metallization of Nanocrystalline Rutile Investigated by High-Pressure Raman Spectroscopy and Electrical Conductivity

Hong

Dai

et al. 2019

Minerals

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We investigate the structural, vibrational, and electrical transport properties of nanocrystalline rutile and its high-pressure polymorphs by Raman spectroscopy, and AC complex impedance spectroscopy in conjunction with the high-resolution transmission electron microscopy (HRTEM) up to ~25.0 GPa using the diamond anvil cell (DAC). Experimental results indicate that the structural phase transition and metallization for nanocrystalline rutile occurred with increasing pressure up to ~12.3 and ~14.5 GPa, respectively. The structural phase transition of sample at ~12.3 GPa is confirmed as a baddeleyite phase, which is verified by six new Raman characteristic peaks. The metallization of the baddeleyite phase is manifested by the temperature-dependent electrical conductivity measurements at ~14.5 GPa. However, upon decompression, the structural phase transition from the metallic baddeleyite to columbite phases at ~7.2 GPa is characterized by the inflexion point of the pressure coefficient and the pressure-dependent electrical conductivity. The recovered columbite phase is always retained to the atmospheric condition, which belongs to an irreversible phase transformation.

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“…Increasing of the pressure to ∼20 GPa initiates emergence of another polytypic form -2H a -MoS 2 [8,9]. This phase differs from 2H b -MoS 2 by a shift of two H-layers relative to each other and a decrease in the interlayer distance.…”

Section: Introductionmentioning

confidence: 98%

“…This phase differs from 2H b -MoS 2 by a shift of two H-layers relative to each other and a decrease in the interlayer distance. The compound 2H a -MoS 2 exhibits metallic properties [9].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of H-T phase transition in MoS2 single layer

Popov¹,

Enyashin²

2019

Nanosystems: Phys. Chem. Math.

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Molybdenum disulfide is a title compound among the layered metal dichalcogenides, being a prominent tribological agent and vital platform for catalysts. The properties of a MoS 2 layer can vary widely, depending upon polymorphic composition. Here, using the density-functional theory calculations, the potential energy surfaces for polymorphic H-and T-MoS 2 layers are mapped. While the energy barriers for H→T and T(T )→H transitions are found to be in fair agreement with previous studies which employed the nudged elastic band method, the bird's-eye view at the energy landscape of MoS 2 layer has disclosed the as-yet undescribed energy plateau attributed to an intermediate -square lattice of MoS 2 layer (S-MoS 2 ). The stability, structural and electronic properties of S-MoS 2 are discussed in comparison with those for H-and T-MoS 2 layers.

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Pressure-induced permanent metallization with reversible structural transition in molybdenum disulfide

Cited by 53 publications

References 44 publications

Experimental Evidence for Partially Dehydrogenated ε-FeOOH

Experimental Evidence for Partially Dehydrogenated ε-FeOOH

Structural Phase Transition and Metallization of Nanocrystalline Rutile Investigated by High-Pressure Raman Spectroscopy and Electrical Conductivity

Thermodynamics of H-T phase transition in MoS2 single layer

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