Hinojosa-Nava R, Mejía-Uriarte E V, Sato-Berrú R Y
Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, 04510 Mexico City, Mexico.
Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, 04510 Mexico City, Mexico.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Nov 5;241:118661. doi: 10.1016/j.saa.2020.118661. Epub 2020 Jul 2.
The structural change by temperature of the ammonia borane has been studied through Raman spectroscopy and principal components analysis (PCA). Its phase transition, from tetragonal to orthorhombic, was observed at 212 K. In addition, between 99 and 83 K, a zone of structural stability was observed. These behaviors could be observed thanks to the application of the PCA technique to the Raman data. Here, we can find a characteristic Raman signal which can also be associated with the orthorhombic structure. Also using the PCA technique, we have observed two Raman bands in the low frequency region, below 100 cm, which could be associated with the lattice vibrational contribution.
