AsS: Bulk inorganic molecular-based chalcogenide glass

Brazhkin, V. V.; Gavrilyuk, Alexander; Lyapin, A. G.; Timofeev, Yu. A.; Katayama, Yoshinori; Kohara, Shinji

doi:10.1063/1.2759261

Cited by 26 publications

(12 citation statements)

References 21 publications

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“…The main structural modification induced by the imprint process was an increased degree of polymerization evidenced by micro-Raman analysis, which was an anticipated result of the heat treatment and an enhancement of the cross-linking due to the relaxation/reformation of defective bonds presented in the as-deposited film network. 20,57…”

Section: Kinetics Of Geometry Shaping In Nanoimprintmentioning

confidence: 99%

High‐Performance, High‐Index‐Contrast Chalcogenide Glass Photonics on Silicon and Unconventional Non‐planar Substrates

Zou

Zhang

Lin

et al. 2014

Advanced Optical Materials

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This paper reports a versatile, roll-to-roll and backend compatible technique for the fabrication of high-index-contrast photonic structures on both silicon and plastic substrates. The fabrication technique combines low-temperature chalcogenide glass film deposition and resist-free singlestep thermal nanoimprint to process low-loss (1.6 dB/cm), sub-micron single-mode waveguides with a smooth surface finish using simple contact photolithography. Using this approach, the first chalcogenide glass micro-ring resonators are fabricated by thermal nanoimprint. The devices exhibit an ultra-high quality-factor of 4 × 10 5 near 1550 nm wavelength, which represents the highest value reported in chalcogenide glass micro-ring resonators. Furthermore, sub-micron nanoimprint of chalcogenide glass films on non-planar plastic substrates is demonstrated, which establishes the method as a facile route for monolithic fabrication of high-index-contrast devices on a wide array of unconventional substrates.

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Section: Kinetics Of Geometry Shaping In Nanoimprintmentioning

confidence: 99%

High‐Performance, High‐Index‐Contrast Chalcogenide Glass Photonics on Silicon and Unconventional Non‐planar Substrates

Zou

Zhang

Lin

et al. 2014

Advanced Optical Materials

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“…Structure-property investigations within the As-S and As-Se system involve not only crystalline solids but also amorphous glasses and melts with semi-metallic character. Most recent studies include investigations of phase diagrams and melt structures (Brazhkin et al 2007(Brazhkin et al , 2008(Brazhkin et al , 2011b. Experimental high-pressure high-temperature investigations revealed three different structures for the AsS liquid state and the formation of a new solid phase at pressures above 4 GPa and temperatures above 400°C (Brazhkin et al 2008(Brazhkin et al , 2011b.…”

Section: Introductionmentioning

confidence: 99%

Crystal-structure properties and the molecular nature of hydrostatically compressed realgar

et al. 2012

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The structure of realgar, As 4 S 4 , and its evolution with pressure have been investigated employing in situ X-ray diffraction, optical absorption and vibrational spectroscopy on single-crystal samples in diamond-anvil cells. Compression under true hydrostatic conditions up to 5.40 GPa reveals equation-of-state parameters of V 0 = 799.4(2.4) Å 3 and K 0 = 10.5(0.4) GPa with K 0 0 = 8.7. The remarkably high compressibility can be attributed to a denser packing of the As 4 S 4 molecules with shortening of the intermolecular bonds of up to 12 %, while the As 4 S 4 molecules remain intact showing rigid-unit behaviour. From ambient pressure to 4.5 GPa, Raman spectra exhibit a strong blue shift of the Raman bands of the lattice-phonon regime of 24 cm -1 , whereas frequencies from intramolecular As-S stretching modes show negligible or no shifts at all. On pressurisation, realgar shows a continuous and reversible colour change from bright orange over deep red to black. Optical absorption spectroscopy shows a shift of the absorption edge from 2.30 to 1.81 eV up to 4.5 GPa, and DFT calculations show a corresponding reduction in the band gap. Synchrotron-based measurements on polycrystalline samples up to 45.5 GPa are indexed according to the monoclinic structure of realgar.

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“…[6][7][8] Molecular chalcogenide glasses synthesized in high pressure/high temperature conditions often show two polyamorphic forms simultaneously, i.e., a molecular cage and a network-related motif. 9,10 The network-related population increases with applied pressure squashing the cage molecules. Here we report a different phenomenon: mercury sulfide dimorphism in network glasses synthesized in usual conditions without external stimuli.…”

Section: Introductionmentioning

confidence: 99%

Mercury Sulfide Dimorphism in Thioarsenate Glasses

et al. 2016

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Crystalline mercury sulfide exists in two drastically different polymorphic forms in different domains of the P,T-diagram: red chain-like insulator α-HgS, stable below 344 °C, and black tetrahedral narrow-band semiconductor β-HgS, stable at higher temperatures. Using pulsed neutron and high-energy X-ray diffraction, we show that these two mercury bonding patterns are present simultaneously in mercury thioarsenate glasses HgS-As2S3. The population and interconnectivity of chain-like and tetrahedral dimorphous forms determine both the structural features and fundamental glass properties (thermal, electronic, etc.). DFT simulations of mercury species and RMC modeling of high-resolution diffraction data provide additional details on local Hg environment and connectivity implying the (HgS2/2)m oligomeric chains (1 ≤ m ≤ 6) are acting as a network former while the HgS4/4-related mixed agglomerated units behave as a modifier.

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AsS: Bulk inorganic molecular-based chalcogenide glass

Cited by 26 publications

References 21 publications

High‐Performance, High‐Index‐Contrast Chalcogenide Glass Photonics on Silicon and Unconventional Non‐planar Substrates

High‐Performance, High‐Index‐Contrast Chalcogenide Glass Photonics on Silicon and Unconventional Non‐planar Substrates

Crystal-structure properties and the molecular nature of hydrostatically compressed realgar

Mercury Sulfide Dimorphism in Thioarsenate Glasses

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