“Shock Wave” Synthesis of Oxygen-Bearing Spinel-Type Silicon Nitride γ-Si3(O,N)4 in the Pressure Range from 30 to 72 GPa with High Purity

Schlothauer, T.; Schwarz, Marcus; Ovidiu, M.; Brendler, Erica; Moeckel, R.; Kroke, Edwin; Heide, G.

doi:10.1007/978-3-642-20018-2_35

Cited by 4 publications

(8 citation statements)

References 18 publications

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“…Although only the spinel phase was found in that material by X-ray diffraction, several chemical analytical methods revealed that the samples contain a certain amount of oxygen. The oxygen content varied within the sample series from [4]. But no systematic picture regarding the oxygen content could be derived from the already existing samples, so far.…”

Section: Introductionmentioning

confidence: 93%

“…The arrangement of the high-explosive charge follows the description in Ref. [4]. The active plane wave lens in this description was replaced by a passive system, following the calculations by Chen [12] with the Hugoniot EoS of PETN explosive [13].…”

Section: Synthesismentioning

confidence: 99%

“…Mainly three samples will be considered: the previously reported SN51 [4], which is prepared from oxygen-poor starting material, and the two new samples SNg5 (oxygen-poor) and SNg4 (oxygen-rich). The amorphous precursor material was mixed with the copper powder and then stepwise compacted into an internal sample holder and a stainless steel container.…”

Section: Synthesismentioning

confidence: 99%

“…In 2002, Sekine [3] claimed to have produced pure ␥-Si 3 N 4 containing no other phases at shock peak pressures of 63 GPa. Schlothauer obtained this phase at a significantly lower pressure of 31 GPa [4]. Although only the spinel phase was found in that material by X-ray diffraction, several chemical analytical methods revealed that the samples contain a certain amount of oxygen.…”

Section: Introductionmentioning

confidence: 96%

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The role of oxygen in shockwave-synthesized γ-Si3N4 material

Köhler

Schlothauer

Schimpf

et al. 2015

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 93%

Section: Synthesismentioning

confidence: 99%

Section: Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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The role of oxygen in shockwave-synthesized γ-Si3N4 material

Köhler

Schlothauer

Schimpf

et al. 2015

Journal of the European Ceramic Society

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“…The pressures were calculated with the material data after the database http://www.ihed.ras.ru/rusbank. For the experiments without buffer plate the temperatures were calculated after the scheme by Sharp [18] and for a better comparability of the experiments the relative temperature [K/GPa] [19]. In the case of experiments with buffer-plates currently a sufficient temperature calculation in not yet possible and still under development.…”

Section: Experimental Methodsmentioning

confidence: 99%

Halide based shock-wave treatment of fluid-rich natural phases

Schlothauer

Schimpf

Brendler

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. For the synthesis of high pressure phases from natural minerals and the shock wave treatment of fluid bearing phases a halide based method was developed. The experiments were performed in the pressure range between 25 and 162 GPa with a success rate for the new method of 100% for the new method. Based on the Impedance Corrected Sample Recovery Capsule under avoiding the adiabatic decompression a direct comparison between different loading paths and sample holder geometries is possible. The recovered samples show neither indications of melting in the case of kaolinite and very limited degassing in the case of carbonates. The recovery of amorphous water bearing Al-Si-phases with Aluminum in four-, five-and six-fold coordination was possible. The samples were analyzed with scanning electron microscopy, x-ray diffraction, nuclear-magnetic-resonance-and infra-red-spectroscopy and the results were directly compared. IntroductionFor geological processes, involving high-pressure (e.g. subduction) fluid phases in minerals plays a very important role. This includes for example the incorporation of water into HP-phases like wadsleyite and ringwoodite [1]. In subduction processes in recent times the possibility of the so called "core sedimentation" [2] of subducted and folded oceanic slabs at the core-mantle boundary is under discussion [3].Because these subducted slabs consists of serpentinized oceanic crust with minor components like calcite, celadonite, iron oxyhydroxides and trace pyrite [4] fluid phases (H 2 O, CO 2 ) will have large influence not only on the melting behavior of these slab. The successful synthesis of HPphases with the coexistence of CO 4 -SiO 6 -structures [5], the synthesis of phases with unexpected stoichiometries [6] and the synthesis of [C 3 O 9 ] 6− -structures [7] indicate the possibility of a number of unknown phases with tetrahedral coordinated carbon to oxygen. These new discovered phases open new possibilities for the understanding of the deep carbon cycle.On the other hand the synthesis of HP-phases with [CO 4 ] 4− -structures with shock-wave methods is very difficult because all kinds of carbonates show a degassing behavior along the

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Spectroscopic Characterization of Rocksalt-Type Aluminum Nitride

et al. 2015

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Starting from nanocrystalline and submicron wurtzite-aluminum nitride (w-AlN) powder rocksalt structure (rs-AlN) samples were synthesized by two different methods of shock wave recovery experiments. The resulting samples contained up to 86% rs-AlN, stable at room temperature, giving for the first time the possibility to comprehensively characterize the material by powder X-ray diffraction, Fourier transform infrared (IR), Raman, and 27 Al NMR spectroscopy. Raman and IR modes were calculated by density functional theory, allowing for the interpretation of the respective experimental spectra. By 27 Al NMR the chemical shift of rsAlN was determined, and the quadrupolar coupling constant was estimated.

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“Shock Wave” Synthesis of Oxygen-Bearing Spinel-Type Silicon Nitride γ-Si3(O,N)4 in the Pressure Range from 30 to 72 GPa with High Purity

Cited by 4 publications

References 18 publications

The role of oxygen in shockwave-synthesized γ-Si3N4 material

The role of oxygen in shockwave-synthesized γ-Si3N4 material

Halide based shock-wave treatment of fluid-rich natural phases

Spectroscopic Characterization of Rocksalt-Type Aluminum Nitride

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