High temperature syntheses of novel nitrido- and oxonitrido-silicates and sialons using rf furnaces

Schnick, Wolfgang; Huppertz, Hubert; Lauterbach, Rainer

doi:10.1039/a803900c

Cited by 130 publications

(130 citation statements)

References 18 publications

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“…6,7 In this context the new super-hard cubic compound BC 2 N has to be mentioned as well. 8 The novel compound Ho 2 [Si 4 N 6 C] by serendipity was obtained in very low yield as a byproduct of Ho 6 [Si 11 N 20 O] when the synthesis was carried out in graphite crucibles. After stoichiometric addition of graphite to the reaction mixture Ho 2 [Si 4 N 6 C] was obtained as a single-phase product.…”

Section: Introductionmentioning

confidence: 99%

High-temperature synthesis, crystal structure, optical properties, and magnetism of the carbidonitridosilicates Ho2[Si4N6C] and Tb2[Si4N6C]

et al. 2001

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Section: Introductionmentioning

confidence: 99%

High-temperature synthesis, crystal structure, optical properties, and magnetism of the carbidonitridosilicates Ho2[Si4N6C] and Tb2[Si4N6C]

et al. 2001

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“…Oxonitridosilicates are closely related to the common oxosilicates and nitridosilicates, the main difference being a partial replacement of oxygen by nitrogen, which is participating in the coordination of silicon (Schnick, Huppertz, Lauterbach, 1999;Schnick, 2001). Similarly to nitridosilicates, they are synthesised by high-temperature reactions, and show high chemical and thermal stability as well as mechanical hardness.…”

Section: Introductionmentioning

confidence: 99%

High-pressure phase transition of the oxonitridosilicate chloride Ce₄[Si₄O_3+xN_7–x]Cl_1–xO_x with x = 0.12 and 0.18

Friedrich¹,

Knorr²,

Friedrich³

et al. 2005

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. The high-pressure behaviour of the oxonitridosilicate chlorides Ce 4 [Si 4 O 3þx N 7Àx ]Cl 1Àx O x , x ¼ 0.12 and 0.18, is investigated by in situ powder synchrotron X-ray diffraction. Pressures up to 28 GPa are generated using the diamond-anvil cell technique. A reversible phase transition of first order occurs at pressures between 8 and 10 GPa. Within this pressure range the high-and the low-pressure phases are observed concomitantly. At the phase transition the unit cell volume is reduced by about 5%, and the cubic symmetry (space group P2 1 3) is reduced to orthorhombic (space group P2 1 2 1 2 1 ) following a translationengleiche group-subgroup relationship of index 3. A fit of a third-order Birch-Murnaghan equation of state to the pÀV data results in a bulk modulus B 0 ¼ 124(5) GPa with its pressure derivative

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“…The characteristic building blocks in the nitridosilicates are SiN 4 -tetrahedra, which readily form a three-dimensional tetrahedral network by sharing corners [1]. In contrast to oxosilicates, where oxygen atoms are either terminally bound to silicon, or connect two tetrahedrally-or octahedrally-coordinated Si atoms, nitrogen atoms can be shared by two, three or even four SiN 4 -tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

“…The nitridosilicates and oxonitridoaluminosilicates are of technological interest due to their high mechanical hardness and strength, their thermal and chemical stability, and their relatively low density [1]. The characteristic building blocks in the nitridosilicates are SiN 4 -tetrahedra, which readily form a three-dimensional tetrahedral network by sharing corners [1].…”

Section: Introductionmentioning

confidence: 99%

Virtual crystal approximation study of nitridosilicates and oxonitridoaluminosilicates

Wilson¹,

Winkler²,

Juarez‐Arellano³

et al. 2008

Journal of Physics and Chemistry of Solids

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We present a density functional theory study of a variety of nitridosilicate and oxonitridoaluminosilicate systems. For the nitridosilicates, we have shown that the DFT-calculated equilibrium structures of BaYbSi 4 N 7 , SrYb-Si 4 N 7 and EuYb-Si 4 N 7 are in good agreement with experiment. We then used the virtual crystal approximation (VCA) to study the effects of oxygen-doping on the nitrogen sites. We then added Si/Al disorder into our system, in order to model the properties of BaYb SiAlON for pressures up to 50 GPa, in order to investigate recent experimental findings. We have found that this system is stable over the whole pressure range, and that the compression mechanism is pure bond length shortening.

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High temperature syntheses of novel nitrido- and oxonitrido-silicates and sialons using rf furnaces

Cited by 130 publications

References 18 publications

High-temperature synthesis, crystal structure, optical properties, and magnetism of the carbidonitridosilicates Ho2[Si4N6C] and Tb2[Si4N6C]

High-temperature synthesis, crystal structure, optical properties, and magnetism of the carbidonitridosilicates Ho2[Si4N6C] and Tb2[Si4N6C]

High-pressure phase transition of the oxonitridosilicate chloride Ce₄[Si₄O_3+xN_7–x]Cl_1–xO_x with x = 0.12 and 0.18

Virtual crystal approximation study of nitridosilicates and oxonitridoaluminosilicates

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High temperature syntheses of novel nitrido- and oxonitrido-silicates and sialons using rf furnaces

Cited by 130 publications

References 18 publications

High-temperature synthesis, crystal structure, optical properties, and magnetism of the carbidonitridosilicates Ho2[Si4N6C] and Tb2[Si4N6C]

High-temperature synthesis, crystal structure, optical properties, and magnetism of the carbidonitridosilicates Ho2[Si4N6C] and Tb2[Si4N6C]

High-pressure phase transition of the oxonitridosilicate chloride Ce4[Si4O3+xN7–x]Cl1–xOx with x = 0.12 and 0.18

Virtual crystal approximation study of nitridosilicates and oxonitridoaluminosilicates

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High-pressure phase transition of the oxonitridosilicate chloride Ce₄[Si₄O_3+xN_7–x]Cl_1–xO_x with x = 0.12 and 0.18