Binäre Stickstoffverbindungen der Hauptgruppenelemente durch Hochdrucksynthesen

Kroke, Edwin

doi:10.1002/1521-3757(20020104)114:1<81::aid-ange81>3.0.co;2-5

Cited by 10 publications

(4 citation statements)

References 75 publications

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“…Die Linienverbreiterung ist vermutlich auf die geringe Kristallitgröße und auf Gitterdefekte zurückzuführen. Ähnliches wurde für γ ‐Si 3 N 4 beobachtet, welches ebenfalls mit der Multi‐Anvil‐Methode10a hergestellt worden war 8. Das zum Vergleich abgebildete Spektrum B wurde hingegen von γ ‐Si 3 N 4 erhalten, das in einer Diamantstempelzelle (DAC)10a synthetisiert wurde 20.…”

Section: Kristallographische Daten Von γ‐Si2alon3unclassified

“…In einer vor kurzem erschienenen Veröffentlichung konnte gezeigt werden, dass sich γ ‐Sialone auch durch Schockwellenverfahren10a synthetisieren lassen,21 was die Herstellung größerer Mengen als bei Anwendung der Multi‐Anvil‐Technik ermöglicht. Außerdem ist es uns gelungen, neben der hier vorgestellten μ ‐Si 2 AlON 3 ‐Phase drei weitere γ ‐Sialone mit x =1.1, 2.0 und 2.1 herzustellen.…”

Section: Kristallographische Daten Von γ‐Si2alon3unclassified

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Spinell-Sialone

Schwarz¹,

Zerr²,

Kroke³

et al. 2002

Angew. Chem.

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Hervorragende mechanische Eigenschaften zeichnen γ‐Si2AlON3 aus, eines der ersten Spinell‐Sialone und 4‐3‐Spinelle. Diese bei 130 000 bar/1800°C synthetisierte Phase übertrifft mit einer Härte von 27.5 GPa deutlich die der Niederdruckmodifikationen α‐ und β‐Sialon, die zur Metallbearbeitung und in Strukturkeramiken eingesetzt werden. Das Bild zeigt einige zur Bestimmung der Härte auf einer γ‐Si2AlON3‐Oberfläche eingebrachte Vickers‐Eindrücke und deutet die strukturelle Verwandtschaft zwischen β‐ und γ‐Sialon und den entsprechenden Si3N4‐Phasen an.

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Section: Kristallographische Daten Von γ‐Si2alon3unclassified

Spinell-Sialone

Schwarz¹,

Zerr²,

Kroke³

et al. 2002

Angew. Chem.

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“…The sp 2 -hybridization of Boron Nitride is often used as temperatureresistant lubricant in industry for e.g. continuously steelmaking [7]. Hexagonal Boron Nitride (hBN) is not applicable for cutting because of its low strength.…”

Section: Introductionmentioning

confidence: 99%

Binderless-cBN as Cutting Material for Ultra-Precision Machining of Stainless Steel

Polte

Lorenz

et al. 2014

AMR

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The ultra–precision cutting of steel materials is possible but needs modifications of machine tools or the workpiece material. One approach of actual research is the development of cutting materials that gives the opportunity for direct cutting of surfaces with ultra–precision quality. Binderless–cBN is here one of the most promising materials. The paper shows results of experimental studies with binderless–cBN as cutting material while turning stainless steel. Various investigations were carried out to determine the wear mechanisms. Furthermore, measurements are shown regarding the surface quality. The achieved results show the high potential ofbinderless–cBN as cutting material for the machining of steel.

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“…2 According to the pressure‐coordination rule, high coordination numbers are likely to occur in high‐pressure polymorphs 3. Therefore, explorative high‐pressure synthesis is a highly valuable tool for the discovery of novel materials with intriguing properties 4. Perhaps one of the most notable examples of an increase in coordination number at high pressures is observed in the case of SiO 2 , which transforms to the six‐coordinated stishovite structure type at pressures exceeding 9 GPa 5.…”

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Pentacoordinate Phosphorus in a High‐Pressure Polymorph of Phosphorus Nitride Imide P₄N₆(NH)

Baumann

Schnick

2014

Angewandte Chemie

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Coordination numbers higher than usual are often associated with superior mechanical properties. In this contribution we report on the synthesis of the high‐pressure polymorph of highly condensed phosphorus nitride imide P4N6(NH) representing a new framework topology. This is the first example of phosphorus in trigonal‐bipyramidal coordination being observed in an inorganic network structure. We were able to obtain single crystals and bulk samples of the compound employing the multi‐anvil technique. γ‐P4N6(NH) has been thoroughly characterized using X‐ray diffraction, solid‐state NMR and FTIR spectroscopy. The synthesis of γ‐P4N6(NH) gives new insights into the coordination chemistry of phosphorus at high pressures. The synthesis of further high‐pressure phases with higher coordination numbers exhibiting intriguing physical properties seems within reach.

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Binäre Stickstoffverbindungen der Hauptgruppenelemente durch Hochdrucksynthesen

Cited by 10 publications

References 75 publications

Spinell-Sialone

Spinell-Sialone

Binderless-cBN as Cutting Material for Ultra-Precision Machining of Stainless Steel

Pentacoordinate Phosphorus in a High‐Pressure Polymorph of Phosphorus Nitride Imide P₄N₆(NH)

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Binäre Stickstoffverbindungen der Hauptgruppenelemente durch Hochdrucksynthesen

Cited by 10 publications

References 75 publications

Spinell-Sialone

Spinell-Sialone

Binderless-cBN as Cutting Material for Ultra-Precision Machining of Stainless Steel

Pentacoordinate Phosphorus in a High‐Pressure Polymorph of Phosphorus Nitride Imide P4N6(NH)

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Pentacoordinate Phosphorus in a High‐Pressure Polymorph of Phosphorus Nitride Imide P₄N₆(NH)