High-pressure structural properties of tetramethylsilane

Qin, Zhen; Chen, Xiao‐Jia

doi:10.1088/1674-1056/25/2/026104

Cited by 3 publications

(2 citation statements)

References 61 publications

(84 reference statements)

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“…Fortunately, an exception was found in tetramethylsilane (Si(CH 3 ) 4 ), which is also one of the Group IVa hydrides and yet shows no decomposion at pressures up to 142 GPa . Although it remains unknown whether Si(CH 3 ) 4 could be metalized or not, our previous work by Raman spectroscopy revealed that new Raman modes, which appeared at around 100 GPa, underwent a dramatic softening and characterized Si(CH 3 ) 4 as semimetallic state possibly as in the case of hydrogen at high pressures. , Even more interestingly, the CH 3 groups within such meterials were proved to be a motivating factor both for maintaining stability under compression and for the softening behaviors of those modes. ,− Moreover, the CH 3 group also shows various interesting behaviors at high pressures, including the restriction in the rotation of the CH 3 group in some compounds (such as CH 3 Hg M (M = Cl, Br, I) and (CH 3 ) 2 XM (X = Sn or Tl) , ) and the different rotational angles in cubic Si(CH 3 ) 4 at 0.58 GPa etc. Additionally, the recent breakthrough in the discovery of superconductivity above recorded high 190 K in H–S compound indicates the possibility of high-temperature superconductivities in hydrogen-dominant hydrides.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Phases of a S-Based Compound: Dimethyl Sulfide

2017

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The high-pressure behavior of dimethyl sulfide was investigated at room temperature by Raman scattering measurements with pressures up to 30.1 GPa. Phase transitions at 1.3, 3.6-5.8, and 17.2 GPa were found and evidenced by the frequency shifts, pressure coefficients, and changes in fwhm of related modes. These phase transitions were suggested to result from the changes in the inter- and intramolecular bonding of the material. Interestingly, the CH groups was compelled to be frozen in positions at a relatively low pressure, suggested by the disappearance of the relative modes softening. In addition, the appearance of lattice mode can also be found at a modest pressure, which makes it possible to gain a superiority for this compound to further investigate the superconductivity with high transition temperatures of bulk hydrogen.

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Section: Introductionmentioning

confidence: 99%

High-Pressure Phases of a S-Based Compound: Dimethyl Sulfide

2017

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“…Rapid technological advancements in recent years allow strong squeezing to be generated in a number of nonlinear processes and quantum systems, e.g., parametric oscillators, [9][10][11][12] second harmonic generation, [13] atom-cavity couplings, [14][15][16] semiconductor microcavities, [17][18][19] optomechanical, [20][21][22] and nonlinear directional couplers (NLDC). [23][24][25][26] Systems having inherent fast nonlinear response, such as Kerr NLDC, however, possess the potential in generating strong squeezed light, especially when placed inside a cavity to resonantly amplify the nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

On the nonclassical dynamics of cavity-assisted four-channel nonlinear coupler

et al. 2018

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The non-classical properties of light propagating in four-channel Kerr waveguides, confined in an optical cavity, are studied. The solution to the Hamiltonian of field operators is obtained semi-analytically by using symmetrically ordered phase-space representation. Full quantum analysis of the input coherent fields displays a strong transition of photon property between the super-Poissonian and sub-Poissonian statistics. It is found that the cavity-assisted multichannel system exhibits enhanced squeezing both in single-and compound-mode. This multichannel system may be utilized as an efficient quantumlight generator.

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Raman spectroscopy studies on dimethyl selenium at pressures of up to 40.6 GPa

Qin

Wang

et al. 2018

J Raman Spectroscopy

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The high‐pressure behavior of dimethyl selenium was investigated at room temperature by Raman scattering measurements with pressures up to 40.6 GPa. With the first solid phase already appeared only at 0.4 GPa, phase transitions at 4.4 and 26.1 GPa were found and evidenced by the wavenumber shifts, pressure coefficients, and changes in full width half maximum of related modes. These phase transitions were suggested to result from the changes in the intermolecular and intramolecular bonding of the material. Interestingly, it was found that deformation mode of CH3 groups exhibited a hyperactive pressure effect, yet the expected softening was never found throughout the compression, suggesting that the CH3 groups became active upon compression. More surprising, a lattice mode appeared only at 0.4 GPa, which not only showed crystalline dimethyl selenium at this pressure but also provided a possibility to design the unique hydrogen bond at such low pressures. These phenomena make it possible to gain superiority for this compound to further investigate the superconductivity with high‐transition temperatures of bulk hydrogen.

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High-pressure structural properties of tetramethylsilane

Cited by 3 publications

References 61 publications

High-Pressure Phases of a S-Based Compound: Dimethyl Sulfide

High-Pressure Phases of a S-Based Compound: Dimethyl Sulfide

On the nonclassical dynamics of cavity-assisted four-channel nonlinear coupler

Raman spectroscopy studies on dimethyl selenium at pressures of up to 40.6 GPa

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