| 查看: 576 | 回复: 3 | ||
Dream-ag金虫 (小有名气)
|
[求助]
Microwave-assisted synthesis and optical property of CdMoO4
|
|
可以请哪位专业人士帮我翻译下这一段吗？感觉专业词汇很多诶 In lattice space, scheelite compounds (CaMoO4,CaWO4,SrMoO4,SrWO4, etc.) correspond to S4 symmetry. A group theoretical analysis of the scheelite structure yields 26 lattice modes at theG point of the Brillouin zone—3Ag+5Au+5Bg+3Bu +5Eg+5Eu. The 13 g modes are Raman active, and the 13 u modes are infrared active(4Au and 4Eu), acoustic (1Au and 1Eu), and silent (3Bu). The Raman active phonon modes can be classified into two types of vibrations,the internal and external modes (rotation and translation) with respect to (w.r.t.) the [MoO4]2 -tetrahedrons. Among them, seven modes are internal stretching vibrations of n1(Ag), n3(Bg), and n3(Eg),and bending of n2(Ag), n2(Bg), n4(Bg), and n4(Eg). The six remaining are external modes—three rotations, two translations, and an unidentified mode. The internal modes correspond to normal vibrations of the [MoO4]2- tetrahedrons, while the external modes involve motions of the metallic atoms (e.g. Ca, Sr, Ba, Cd, etc.) w.r.t.[MoO4]2-tetrahedrons [10–12,15,18–20]. It is expected that the frequencies and wavenumbers of the internal stretching modes are higher than those of the external ones, because the internal covalent bonding within the [MoO4]2- tetrahedrons is stronger than the external lattice binding. Fig. 3a shows the Raman spectra of CdMoO4 produced by the microwave radiation method under different conditions. They show strong Raman peaks that indicate a strong interaction between the ions, which mainly arise from the stretching and bending vibrations of the shorter metal–oxygen bonds within the anionic groups. All Raman spectra were identified as n1(Ag),n3(Bg), n3(Eg), n4(Eg,Bg), and n2(Ag,Bg) at 862, 820, 755, 396, and 309 cm-1 , respectively. Three rotation and two translation modes of [MoO4]2- units were detected at 280, 192, 153, 135, and 102 cm-1,respectively. These results are in accordance with those reported in the literature, although their wavenumber vibra-tion modes were not exactly the same values, due to the difference in geometries, particle sizes, and nature of the products |
回复此楼» 猜你喜欢
一志愿西安交通大学材料工程专业 282分求调剂
已经有13人回复
-
北科281学硕材料求调剂
已经有6人回复
-
328求调剂，英语六级551，有科研经历
已经有10人回复
-
298求调剂
已经有6人回复
-
310求调剂
已经有4人回复
-
311求调剂
已经有6人回复
-
307求调剂
已经有11人回复
-
材料与化工085600，总分304，本科有两篇sci参与，求调剂
已经有5人回复
-
315分，诚求调剂，材料与化工085600
已经有3人回复
-
求调剂一志愿海大，0703化学学硕304分，有大创项目，四级已过
已经有10人回复
qfzcom
铁杆木虫 (著名写手)
- 翻译EPI: 40
- 应助: 34 (小学生)
- 贵宾: 0.062
- 金币: 4748.6
- 散金: 56
- 红花: 8
- 沙发: 11
- 帖子: 2122
- 在线: 207.6小时
- 虫号: 2081714
- 注册: 2012-10-23
- 专业: 环境工程
2楼2013-10-15 17:55:14
Dream-ag
金虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 1000.9
- 散金: 402
- 红花: 6
- 帖子: 211
- 在线: 112.1小时
- 虫号: 2099352
- 注册: 2012-11-01
- 性别: MM
- 专业: 环境工程
3楼2013-10-15 18:42:07
4楼2013-10-16 00:22:09
