Compression behaviour of nitridocarbidosilicates studied with X-ray diffraction and ab initio calculations

Friedrich, Alexandra; Knorr, K.; Winkler, Björn; Friedrich, Alexandra; Höppe, Henning A.; Schnick, Wolfgang; Milman, Victor; Hanfland, Michael

doi:10.1016/j.jpcs.2008.09.016

Cited by 7 publications

(5 citation statements)

References 26 publications

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“…Reaction of the respective lanthanide metals with carbon and Si(NH) 2 led to isostructural compounds RE 2 [Si 4 N 6 C] with RE = Y, Tb, Ho, Er. [108][109][110] The structure contains a condensed network of corner-sharing, star-like [C(SiN 3 ) 4 ] units. Apparently, the range of composition of nitridosilicates can be extended by the substitution of N by C, leading to carbidonitridosilicates.…”

Section: Tectosilicatesmentioning

confidence: 99%

Nitridosilicates and Oxonitridosilicates: From Ceramic Materials to Structural and Functional Diversity

2011

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Silicates are one of the most important classes of compounds on this planet, and more than 1000 silicates have been identified in the mineral kingdom. Additionally, several hundreds of artificial silicates have been synthesized. The substitution of oxygen by nitrogen leads to the structurally diverse and manifold class of nitridosilicates. Silicon nitride, one of the most important non-oxidic ceramic materials, is the binary parent compound of nitridosilicates, and it symbolizes the inherent material properties of these refractory compounds. However, prior to the last decades, a broad systematic investigation of nitridosilicates had not been accomplished. In the meantime, these and related compounds have reached a remarkable level of industrial application. This review illustrates recent progress in synthesis and structure-property relationships and also applications of nitridosilicates, oxonitridosilicates, and related SiAlONs.

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Section: Tectosilicatesmentioning

confidence: 99%

Nitridosilicates and Oxonitridosilicates: From Ceramic Materials to Structural and Functional Diversity

2011

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“…Moreover, it is known that the tetrahedral network dominates the compressibility in siliconitrides, aluminiumsiliconoxonitrides, and siliconcarbidenitrides. 14,15,44 Therefore, we will focus our discussion on the corner-sharing tetrahedral network ͓starshaped building blocks, X ͓4͔ ͑RW 3 ͓2͔ ͒ 4 ; ͑X , W͒ =N,C,O and R =Si,Al,Co͔. A comparison of R − X ͓4͔ and R − W ͓2͔ bond lengths is shown in Fig.…”

Section: Bulk Compressibilitymentioning

confidence: 99%

“…In M 2 Si 4 N 6 C ͑M =Ho,E; P12 1 / c1͒ the monoclinic lattice parameters are related to the hexagonal lattice as a m ϳ a h , c m ϳ 2b h , b m ϳ c h , and ␤ ϳ 120°, with b m being the most compressible axis. 15 In the HoBaCo 4 O 7 corner-sharing tetrahedral network, the Co͑1͒-O͑2͒ and the Co͑2͒-O͑3͒ bonds are shortened by about …”

Section: Linear Compressibilitymentioning

confidence: 99%

“…We have already performed high-pressure x-ray diffraction experiments on siliconitrides, aluminiumsiliconoxonitrides, and siliconcarbidenitrides, where no fourfoldcoordinated oxygen ions ͑O ͓4͔ ͒ have been observed. 14,15 These compounds are very stable with respect to pressure, and no structural phase transition has been observed up to 42 GPa. Nothing is known about the influence of pressure on MBaCo 4 O 7 structures, but the apparent thermal instability suggests that these compounds may undergo structural phase transitions at elevated pressures.…”

Section: Introductionmentioning

confidence: 99%

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Single-crystal structure ofHoBaCo4O7at ambient conditions, at low temperature, and at high pressure

et al. 2009

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We show that the correct space group of HoBaCo 4 O 7 at ambient conditions is P6 3 mc and that no temperature-induced or pressure-induced structural phase transition occurs down to 100 K or up to 9 GPa. The compressibility of HoBaCo 4 O 7 is mainly determined by a combination of bond compression and changes in the three-membered and six-membered rings of the kagomé layers. HoBaCo 4 O 7 is more compressible than structurally related compounds due to the comparatively compressible Co-O bonds. The structural analysis allows us to propose an atomistic model for the extremely high oxygen incorporation capability of HoBaCo 4 O 7 .

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“…Reported data on bulk modulus for compounds in the SrSi-O-N system for binary [53][54][55][56] and ternary 57 compounds, for a quaternary compound (the present result), as well as for some other oxynitrides, [58][59][60][61][62] oxycarbides, 63 and complex nitrides 64 are quoted in Table IV. As demonstrated in Table IV Table I, those with the highest N/(N+O) ratio will exhibit the largest bulk modulus value and vice versa.…”

Section: ∂K ∂Pmentioning

confidence: 68%

Equation of state for Eu-doped SrSi2O2N2

Ermakova

Paszkowicz

Kamińska

et al. 2014

The Journal of Chemical Physics

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α-SrSi2O2N2 is one of the recently studied oxonitridosilicates applicable in optoelectronics, in particular in white LEDs. Its elastic properties remain unknown. A survey of literature shows that, up to now, nine oxonitridosilicate materials have been identified. For most of these compounds, doped with rare earths and manganese, a luminescence has been reported at a wavelength characteristic for the given material; all together cover a broad spectral range. The present study focuses on the elastic properties of one of these oxonitridosilicates, the Eu-doped triclinic α-SrSi2O2N2. High-pressure powder diffraction experiments are used in order to experimentally determine, for the first time, the equation of state of this compound. The in situ experiment was performed for pressures ranging up to 9.65 GPa, for Eu-doped α-SrSi2O2N2 sample mounted in a diamond anvil cell ascertaining the hydrostatic compression conditions. The obtained experimental variation of volume of the triclinic unit cell of α-SrSi2O2N2:Eu with rising pressure served for determination of the Birch-Murnaghan equation of state. The determined above quoted bulk modulus is 103(5) GPa, its first derivative is 4.5(1.1). The above quoted bulk modulus value is found to be comparable to that of earlier reported oxynitrides of different composition.

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Compression behaviour of nitridocarbidosilicates studied with X-ray diffraction and ab initio calculations

Cited by 7 publications

References 26 publications

Nitridosilicates and Oxonitridosilicates: From Ceramic Materials to Structural and Functional Diversity

Nitridosilicates and Oxonitridosilicates: From Ceramic Materials to Structural and Functional Diversity

Single-crystal structure ofHoBaCo4O7at ambient conditions, at low temperature, and at high pressure

Equation of state for Eu-doped SrSi2O2N2

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