Structure and phase composition of a catalyst for carbon nanofiber formation

Formation of Hägg Carbide in an Fe-30Mn-10Al-4Cr-0.45C Alloy

“…By using electron diffraction, the orientation relationship between the Fe 5 C 2 and Fe 3 C was determined to be ð100Þ Fe 5 C 2 == ð001Þ Fe 3 C . 22,23) In addition, they correlated the obtained result with the orientation relationship between Fe 3 C and phase, ð001Þ Fe 3 C == ð211Þ , which was reported by other workers in ferritic stainless steel. 24) Therefore, they deduced that the orientation relationship among Fe 5 C 2 , Fe 3 C and phase was ð100Þ Fe 5 C 2 == ð001Þ Fe 3 C == ð211Þ .…”

“…1 . Based on these lattice parameters, the interplanar spacings and the angles between the chosen reciprocal reflections were calculated by using the following equations: The calculated interplanar spacings and angles are also listed in Table 1 [19][20][21][22][23] it is clear that the crystal structure of the precipitate corresponds to that of the Hägg carbide (M 5 C 2 -type carbide).…”

“…(II) The Hägg carbide was extensively observed by many workers in the bcc-type alloys. [20][21][22][23][24] Depending on the chemical compositions, the lattice parameters of the Hägg carbide varied in the range of a ¼ 1:150{1:158 nm, b ¼ 0:452{0:457 nm, c ¼ 0:501{0:509 nm and ¼ 97:6{98:3 . [19][20][21][22] However, to date, the orientation relationship between the Hägg carbide and the bcc-type (i.e.…”

“…, D0 3 , B2) structure is very deficient. We are aware of two articles, 22,23) in which they reported that both Fe 5 C 2 carbide and Fe 3 C carbide were formed intimately in -iron after being heat-treated at 500-800 C under a CO or/and H 2 atmosphere. By using electron diffraction, the orientation relationship between the Fe 5 C 2 and Fe 3 C was determined to be ð100Þ Fe 5 C 2 == ð001Þ Fe 3 C .…”

Large Scale Synthesis of Carbon Nanofibres on Sodium Chloride Support

“…The basic idea behind using a water soluble support returns to Steigerwalt and Lukehart [17] who employed silicate or carbonate. Metal catalysts, such as Fe [18][19][20][21], Ni [22,23], Cu [24], Co [25,26] and their alloys [27], have been investigated widely. However, until now, the reported catalysts require the lengthy process of reduction and calcination for their preparation [11,13].…”