Phase transition in confined Se nanoclusters

Autor:	Irene L. Li, Z. K. Tang
Rok vydání:	2004
Předmět:	Crystallography Phase transition Differential scanning calorimetry Materials science Phase (matter) Melting point Analytical chemistry General Physics and Astronomy Atmospheric temperature range Dihedral angle Amorphous solid Nanoclusters
Zdroj:	Journal of Applied Physics. 95:6364-6367
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1710728
Popis:	Phase transition of Se species incorporated in the AlPO4-5 nanoporous matrix has been investigated by differential scanning calorimetry and temperature dependent vibrational spectra. The thermal adsorption/desorption process shows that the confined Se species have structure transformations at temperature range 320–350 K. At low temperature (85 K), the vibrational peaks are sharp and well dissolved. Two different transformation processes in Se nanosized species have been observed with increasing temperature: (i) the amorphous like selenium in the mesochannles (structural imperfection) is crystallized, forming more stable chain-based trigonal crystalline like selenium and (ii) isolated Se chains become flexible. At low temperature, weak distortion in the dihedral angle occurs. At temperature above 320 K, Se chains change to another phase with strongly disordered structure (“melting” state).
Databáze:	OpenAIRE
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