Stability of the Silicon Yttrium Oxynitrides

Wills, R. R.; Cunningham, J. E.; Wimmer, J. M.; Stewart, R. W.

doi:10.1111/j.1151-2916.1976.tb10955.x

Cited by 32 publications

(4 citation statements)

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“…The formation of the apatite-type phase of the composition of NaY 9 Si 6 O 26 in the ternary system Na 2 O-Y 2 O 3 -SiO 2 was also reported by LEE et al [101]. [105], does.…”

Section: Other Apatite-type Ree Silicatessupporting

confidence: 71%

“…Nevertheless, the formation of oxyapatite phase of the composition of Y 4.67 □ 0.33 (SiO 4 ) 3 O (7:9) prepared via the oxidation of nitrogen apatite Y 5 (SiO 4 ) 3 N was reported by other authors [7], [97]. The apatite-like phase Y 4.67 (SiO 4 ) 3 O possesses hexagonal structure with the space group P6 3 /M, a = 9.368 and c = 6.735 Å [78], [98].…”

Section: Other Apatite-type Ree Silicatesmentioning

confidence: 93%

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Rare-earth Element-bearing Apatites and Oxyapatites

Ptáček¹

2016

Apatites and Their Synthetic Analogues - Synthesis, Structure, Properties and Applications

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A number of prepared alkaline-earth-rare-earth silicates and germanates also have the structure of apatite type. The fifth chapter of this book then continues with description of synthetic compounds of apatite structure. Attention will be directed to description of rare-earth element bearing apatites and oxyapatites. The structure, properties and preparation of apatite-type silicates, germanates and borates were described. This chapter gives also description of oxygen-rich apatites, which are promising material for electrolytes in solid oxide fuel cells and sensors and explain the basic concepts between structure and conductivity of these compounds. The additional information about application of apatites is given in the last chapter of this book. Furthermore, N-apatite, REE vanadocalcic apatite and apatite type yttrium phosphates were described.

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“…The formation of the apatite-type phase of the composition of NaY 9 Si 6 O 26 in the ternary system Na 2 O-Y 2 O 3 -SiO 2 was also reported by LEE et al [101]. [105], does.…”

Section: Other Apatite-type Ree Silicatessupporting

confidence: 71%

Section: Other Apatite-type Ree Silicatesmentioning

confidence: 93%

Rare-earth Element-bearing Apatites and Oxyapatites

Ptáček¹

2016

Apatites and Their Synthetic Analogues - Synthesis, Structure, Properties and Applications

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“…This stoichiometry ratio explains why with the increase of the amorphous SiCN phase content, yttrium silicate changes from Y 2 SiO 5 to Y 4.67 (SiO 4 ) 3 O, and finally to Y 2 Si 2 O 7 . Besides, according to reactions () and (), 49,50 nitrogen‐containing phases may also oxidize and generate Y 4 Si 2 N 2 O 7 . Subsequently, Y 4 Si 2 N 2 O 7 reacts with oxygen and decomposes into Y 4.67 (SiO 4 ) 3 O and Y 2 O 3 .…”

Section: Discussionmentioning

confidence: 99%

Thermal properties of field‐assisted‐sintered SiCN–Y₂O₃ composites

Zhang

Maiti

et al. 2022

Int J Applied Ceramic Tech

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Polymer‐derived amorphous SiCN has excellent high‐temperature stability and properties. To reduce the shrinkage during pyrolysis and to improve the high‐temperature oxidation resistance, Y2O3 was added as a filler. In this study, polymer‐derived SiCN–Y2O3 composites were fabricated by mixing a polymeric precursor of SiCN with Y2O3 submicron powders in different ratios. The mixtures were cross‐linked and pyrolyzed in argon. SiCN–Y2O3 composites were processed using field‐assisted sintering technology at 1350°C for 5 min under vacuum. Dense SiCN–Y2O3 composite pellets were successfully made with relative density higher than 98% and homogeneous microstructure. Due to low temperature and short time of the heat‐treatment, the grain growth of Y2O3 was substantially inhibited. The Y2O3 grain size was ∼1 μm after sintering. The composites’ heat capacity, thermal diffusivity, and thermal expansion coefficients were characterized as a function of temperature. The thermal conductivity of the composites ceramics decreased as the amount of amorphous SiCN increased and the coefficient of thermal expansion (CTE) of the composites increased with Y2O3 content. However, the thermal conductivity and CTE did not follow the rule of mixture. This is likely due to the partial oxidation of SiCN and the resultant impurity phases such as Y2SiO5, Y2Si2O7, and Y4.67(SiO4)3O.

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“…92 Figure 12 reveals that apatite can form when YZO interacts with the more acidic melts, but not with the highest ends of the Ca:Si range. The inference is that apatite may form without CaO in these systems, but not without SiO 2 (Y 4.67 Si 3 O 13 apatite has been reported in the literature 110 but later shown to be stabilized by impurities 111 ). In contrast with YDS and YMS, YZO cannot contribute the requisite SiO 2 to the reaction.…”

Section: Apatite Formation Domainsmentioning

confidence: 95%

Protocol for selecting exemplary silicate deposit compositions for evaluating thermal and environmental barrier coatings

et al. 2022

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A protocol for selecting representative silicate compositions for comparative testing of gas turbine coating materials is presented. It begins with a curated dataset of compositions of engine deposits and naturally occurring siliceous debris including volcanic ashes, sands, and dusts. The compositions are first reduced to the five major oxides—those of Ca, Mg, Fe, Al, and Si—and then distilled further using principal component analysis and k‐means clustering. The process ultimately yields four classes of possible deposits with common chemical characteristics. Each class is represented by a composition centroid and a range in Ca:Si ratios. Key thermophysical properties of the possible deposits are calculated and related to the glass network connectivity, characterized by the Si:O ratio. Finally, deposits from each of these classes are compared in terms of their reactions with prototypical thermal and environmental barrier oxides, with due consideration of the effects of composition variations within each deposit class. The protocol is, in principle, adaptable to datasets compiled by OEMs and researchers in gas turbine coatings.

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Stability of the Silicon Yttrium Oxynitrides

Cited by 32 publications

References 1 publication

Rare-earth Element-bearing Apatites and Oxyapatites

Rare-earth Element-bearing Apatites and Oxyapatites

Thermal properties of field‐assisted‐sintered SiCN–Y₂O₃ composites

Protocol for selecting exemplary silicate deposit compositions for evaluating thermal and environmental barrier coatings

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Stability of the Silicon Yttrium Oxynitrides

Cited by 32 publications

References 1 publication

Rare-earth Element-bearing Apatites and Oxyapatites

Rare-earth Element-bearing Apatites and Oxyapatites

Thermal properties of field‐assisted‐sintered SiCN–Y2O3 composites

Protocol for selecting exemplary silicate deposit compositions for evaluating thermal and environmental barrier coatings

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Product

Resources

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Thermal properties of field‐assisted‐sintered SiCN–Y₂O₃ composites