Untersuchungen in den Dreistoffsystemen: Molybdän-Silizium-Bor, Wolfram-Silizium-Bor und in dem System: VSi2−TaSi2

Nowotny, H.; Dimakopoulou, Elisabeth; Kudielka, Heinz

doi:10.1007/bf00901624

Cited by 122 publications

(59 citation statements)

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“…The compositional boundary of MojSij {T, phase) on the Mo-rich side extends to -37 at% Si and on the Si-rich side to -39 at% Si. The B solubility in the T, phase has been found to be much more limited than that reported by Nowotny [57Now] and is in agreement with a recent assessment [OOHue].…”

Section: Security Classification Ofsupporting

confidence: 80%

Phase Stability and Microstructure Control in High Temperature (Mo,Nb)-Si-B Alloys

Perepezko¹

2003

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Section: Security Classification Ofsupporting

confidence: 80%

Phase Stability and Microstructure Control in High Temperature (Mo,Nb)-Si-B Alloys

Perepezko¹

2003

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“…The silicide Mo$is, on the other hand, has much poor oxidation resistance at high temperatures. However, the oxidation properties of Mo#i~can be substantially improved by adding boron, as mentioned in the article of Nowotny et al [7]. The excellent oxidation resistance of Mo#iJ-base silicides doped with B has been confirmed recently by Meyer et al [1][2][3].…”

Section: Introductionmentioning

confidence: 51%

Processing, Microstructure, and Properties of Multiphase Mo Silicide Alloys

1998

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--Q Wi !.< Multiphase Mo silicide alloys containing T2 (Mo#iBz), Mo$i and Mo phases were prep~d by'b oth melting & casting (M&C) and powder meta.hrgical (PM) processes. GIassy phases we observed in PM materiais but not in M&C materials. Microstructural studies indicate that the primary phase is Me-rich solid solution in alloys containing <(9.4Si+13.8B, at. %) and T2 in alloys with 2(9.8Si+14.6B). An eutectic composition is estimated to be close to Mo-9.6Si-14.2B. The mechanical properties of muhiphase silicide alloys were determined by hardness, tensile and bending tests at room temperature. .The multiphase alloy MSB-1 8 (Mo-9.4Si-13.8B) possesses a flexure strength distinctly higher than that of MoSi2 and other Mo#i~silicide alloys containing no Mo particles. Also, MSB-18 is tougher than MoSi2 by a factor of 4.

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“…Moreover, Si and B are available in smaller quantities than Mo, meaning that SiB x formation would go at the cost of both MoSi x and MoB x formation. Furthermore, the segregation of the MoB x and MoSi x in two layers can be attributed to the low solubility of B in MoSi x , 13 and the large interfacial energy associated with a possible eutectic structure. As for the sequence of the two layers: for a MoSi x on MoB x structure, the travel distance for Si would be relatively small, because it does not have to travel through the MoB x layer in order to reach the Mo underneath.…”

Section: A Mo/b/simentioning

confidence: 99%

Chemical interaction of B4C, B, and C with Mo/Si layered structures

Rooij-Lohmann

Veldhuizen

Zoethout

et al. 2010

Journal of Applied Physics

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To enhance the thermal stability, B 4 C diffusion barrier layers are often added to Mo/Si multilayer structures for extreme ultraviolet optics. Knowledge about the chemical interaction between B 4 C and Mo or Si, however is largely lacking. Therefore, the chemical processes during annealing up to 600°C of a Mo/ B 4 C / Si layered structure have been investigated in situ with hard x-ray photoelectron spectroscopy and ex situ with depth profiling x-ray photoelectron spectroscopy. Mo/ B/Si and Mo/C/Si structures have also been analyzed as reference systems. The chemical processes in these systems have been identified, with two stages being distinguished. In the first stage, B and C diffuse and react predominantly with Mo. MoSi x forms in the second stage. If the diffusion barrier consists of C or B 4 C, a compound forms that is stable up to the maximum probed temperature and annealing time. We suggest that the diffusion barrier function of B 4 C interlayers as reported in literature can be caused by the stability of the formed compound, rather than by the stability of B 4 C itself.

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Untersuchungen in den Dreistoffsystemen: Molybdän-Silizium-Bor, Wolfram-Silizium-Bor und in dem System: VSi2−TaSi2

Cited by 122 publications

References 0 publications

Phase Stability and Microstructure Control in High Temperature (Mo,Nb)-Si-B Alloys

Phase Stability and Microstructure Control in High Temperature (Mo,Nb)-Si-B Alloys

Processing, Microstructure, and Properties of Multiphase Mo Silicide Alloys

Chemical interaction of B4C, B, and C with Mo/Si layered structures

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