Electron X-ray beam ko k 1 入 Ewald sphere Reciprocal lattice model of polycrystalline specimen 11
1 𝜆 Electron beam 11 Reciprocal lattice model of polycrystalline specimen k0 k g X-ray
Indexing a ring pattern Diffraction pattern of electron beam passing through Al foil λL Rd=λL,R= d ®4 & Indexing a pattern means to assign a set of (hkl)to each R diffraction ring,similar to the interpretation of XRD pattern ~2%accuracy in lattice spacing, much more inferior to that of XRD. 12 (p.114 in the textbook)
Indexing a ring pattern 12 𝑅𝑑 = 𝜆𝐿, 𝑅 = 𝜆𝐿 𝑑 Indexing a pattern means to assign a set of (hkl) to each diffraction ring, similar to the interpretation of XRD pattern ~2% accuracy in lattice spacing, much more inferior to that of XRD. (p.114 in the textbook)
PDF card of Al (#04-0787) 220 311 200 111 04-0787 Quality:* CAS Number:7429-90-5 Aluminum Molecular Weight:26.98 Ref:Swanson,Tatge,Natl.Bur.Stand.[U.S.],Circ.539,1,11 (1953] Volume[CD]: 66.40 Dx:2.699 Dm: Sys:Cubic Lattice:Face-centered S.G.:Fm3m225) Cell Parameters: HIS pax!y a4.049b 丝 B y SS/F0M:F9=93.0108.9) 3.6 1.8 0.9 d(? 1/1cor:3.62 Rad:CuKa1 d(A] Int-f h k d[A] Int-f h k I d[A] Int-f h k I Lambda:1.54056 2.3380 1 111 1.2210 2 311 92890 331 Filter:Ni 2.0240 47 00 1.1690 2 2 90550 4 2 d-sp: 1.4310 2 2 2 1.0124 2 0 82660 8 422 Mineral Name: Aluminum,syn 13
PDF card of Al (#04-0787) 13
Diffraction pattern of electron beam passing through Al foil AI 220311 200 111 Consistency between SAED and XRD 4转E动 E 270 (ozz) 图 Notice the difference in denoting the patterns. 14
Al 14 (111) (200) (220) (311) (222) (400) Consistency between SAED and XRD Notice the difference in denoting the patterns
Example 100nm A Cubic system 51/n 15
Example 15 Cubic system