材料科學(xué)基礎(chǔ)(清華大學(xué))-文庫(kù)吧資料
2025-03-28 04:15本頁(yè)面
【正文】 rmine the density of BCC iron, which has a lattice parameter of .4. Prove that the Afacecentered hexagonal lattice is not a new type of lattice in addition to the 14 space lattices.5. Draw a primitive cell for BCC lattice.Thank you !3。uⅡ. 14 types of Bravais lattices 1. Derivation of Bravais lattices Bravais lattices can be derived by adding points to the center of the body and/or external faces and deleting those lattices which are identical. 74＝＝ 28Delete the 14 types which are identical28－－ 14＝＝ 14+ + +P I C F2. 14 types of Bravais latticenTricl: simple (P)nMonocl: simple (P). basecentered (C)nOrthor: simple (P). bodycentered (I). basecentered (C). facecentered (F)nTetr: simple (P). bodycentered (I)nCubic: simple (P). bodycentered (I). facecentered (F)nRhomb: simple (P). nHexagonal: simple (P).Crystal systems(7)Lattice types (14)P C F I A B C1 Triclinic √2 Monoclinic √ √ or √(γ≠90176。
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