| 查看: 579 | 回复: 3 | |||
[交流]
The Bravais Lattices Song 已有3人参与
|
|
The Bravais Lattices Song Walter F. Smith 1-22-02 If you have to fill a volume with a structure that’s repetitive, Just keep your wits about you, you don’t need to take a sedative! Don’t freeze with indecision, there’s no need for you to bust a seam! Although the options may seem endless, really there are just fourteen! There’s cubic, orthorhombic, monoclinic, and tetragonal, There’s trigonal, triclinic, and then finally hexagonal! There’s only seven families, but kindly set your mind at ease— ‘Cause four have sub-varieties, so there’s no improprieties! (Chorus: ‘Cause four have sub-varieties, so there’s no improprieties. ‘Cause four have sub-varieties, so there’s no improprieties. ‘Cause four have sub-varieties, so there’s no impropri-e, prieties!) These seven crystal systems form the fourteen Bravais lattices. They’ve hardly anything to do with artichokes or radishes – They’re great for metals, minerals, conductors of the semi-kind – The Bravais lattices describe all objects that are crystalline! The cubic is the most important one in my “exparience”, It comes in simple and in face- and body-centered variants. And next in line’s tetragonal, it’s not at all diagonal, Just squished in one dimension, so it’s really quite rectagonal! The orthorhombic system has one less degree of symmetry Because an extra squish ensures that a not equals b or c. If angle gamma isn’t square, the side lengths give the “sig-o-nal” For monoclinic if they’re different, or, if equal, trigonal! (Chorus (reprovingly): Of course for trigonal, recall that alpha, beta, gamma all Are angles that are equal but don’t equal ninety, tut, tut, tut! Are angles that are equal but don’t equal ninety, tut, tut, tut, tut tut!) If you squish the lattice up in every way that is conceivable, You’ll get the least amount of symmetry that is achievable – It’s called triclinic, then remains the one that really self explains – Hexagonal gives us no pains, and so we now may rest our brains! 附件：MP3 and rm doc and pdf |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com - 附件 1 : bravais.mp3
- 附件 2 : bravais.rm
- 附件 3 : bravais.doc
- 附件 4 : bravais.pdf
2013-04-11 06:39:46, 2.96 M
2013-04-11 06:40:25, 502.65 K
2013-04-11 06:40:47, 363.5 K
2013-04-11 06:40:53, 134.6 K
» 本帖已获得的红花（最新10朵）
» 猜你喜欢
一志愿中南大学化学0703总分337求调剂
已经有6人回复
-
332求调剂
已经有8人回复
-
296求调剂
已经有7人回复
-
375求调剂
已经有6人回复
-
0703 化学 求调剂，一志愿山东大学 342 分
已经有6人回复
-
环境科学与工程334分求调剂
已经有5人回复
-
337求调剂
已经有6人回复
-
求调剂 有机化学考研356分
已经有8人回复
-
285求调剂
已经有7人回复
-
求化学调剂
已经有9人回复
鹰羽龙
木虫 (著名写手)
- 应助: 141 (高中生)
- 金币: 3479.1
- 散金: 1499
- 红花: 13
- 帖子: 1267
- 在线: 956.4小时
- 虫号: 369935
- 注册: 2007-05-13
- 性别: GG
- 专业: 理论和计算化学
2楼2013-04-12 08:46:07
3楼2013-04-12 09:55:37
送红花一朵
 |
4楼2013-04-12 11:49:50
10