| 查看: 583 | 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 |
» 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
085600材料与化工调剂
已经有14人回复
一志愿北化085600材料专硕275|有文章专利|求调剂
已经有10人回复
材料科学与工程求调剂
已经有9人回复
一志愿 南京航空航天大学 ,080500材料科学与工程学硕
已经有3人回复
材料科学与工程调剂
已经有10人回复
274求调剂
已经有4人回复
一志愿食品科学与工程083200求调剂
已经有3人回复
311求调剂一志愿合肥工业大学
已经有3人回复
266分,求材料相关专业调剂
已经有8人回复
材料求调剂 一志愿哈工大总分298分,前三科223分
已经有10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














回复此楼