کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7690994 | 1495965 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pressure dependent Raman studies in the K2Mo2O7·H2O crystal
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Pressure dependent Raman studies in the K2Mo2O7·H2O crystal Pressure dependent Raman studies in the K2Mo2O7·H2O crystal](/preview/png/7690994.png)
چکیده انگلیسی
The pressure dependent Raman scattering in the potassium molybdenum oxide hydrate crystal, K2Mo2O7·H2O, was measured. The high pressure Raman study showed, that the compound remains in the triclinic structure within the 0.0-3.81 GPa range and undergoes a structural phase transition between 3.81 and 4.13 GPa. This particular phase transition is most likely connected with changes in the Raman spectrum, in which the number of modes associated originally with the stretching vibrations in the MoO5 and MoO6 units is increased. However, the phase at atmospheric pressure shows bands due to the presence of only one equivalent site, while in the high-pressure phase, two bands are associated with the stretching modes. Continuing the pressure evolution up to 17.04 GPa, two further phase transitions occurred in this crystal in the 6.3-8.1 GPa and the 12.3-14.0 GPa range, respectively. The Raman spectra measured at about 17.04 GPa presented a crystal structure, which experienced a pre-amorphization with a total loss of all lattice modes. This particular result is indicative that this material may have undergone a complete amorphization at pressures larger than 17.04 GPa. Then, the reversible character in the triclinic P-1 (Ci1) structure was recovered after releasing the pressure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vibrational Spectroscopy - Volume 94, January 2018, Pages 89-94
Journal: Vibrational Spectroscopy - Volume 94, January 2018, Pages 89-94
نویسندگان
G.D. Saraiva, J.A. Jr, F.F. de Sousa, J.H. da Silva, V.O. Sousa Neto, A.J. Ramiro de Castro, J. Mendes Filho,