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Effects of the source temperature on the formation of a metastable HgI2 phase and consequences for the nucleation and growth behaviors in PVT ampoules
- Source :
-
Journal of Crystal Growth . Apr2006, Vol. 290 Issue 1, p111-114. 4p. - Publication Year :
- 2006
-
Abstract
- Abstract: By examining the nucleation and growth phenomena for HgI2 crystals in physical vapor transport ampoules with a variation of temperatures of the source powder side T sou and of the crystal growth side T cry both are near its solid–solid phase transition temperature , our experimental results reveal that under : (1) the solid (α or β) phase structure of the as-grown HgI2 crystal is surprisingly governed by T sou; (2) the temperature range of existence for the metastable β-HgI2 phase in crystal growth side is about 17°C below T c; and (3) by turning a rotating motor to act as mechanical perturbations, this temperature range of existence for β-phase now reduces to about 11°C below T c. To explain these phenomena, especially for the metastable β-phase formed at , a model based on an existence of the vaporized HgI2 clusters in vapor transport region with specific nanostructure dominated by T sou is proposed. [Copyright &y& Elsevier]
- Subjects :
- *NANOSTRUCTURES
*MERCURY compounds
*CRYSTAL growth
*CRYSTALLIZATION
Subjects
Details
- Language :
- English
- ISSN :
- 00220248
- Volume :
- 290
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Crystal Growth
- Publication Type :
- Academic Journal
- Accession number :
- 20262434
- Full Text :
- https://doi.org/10.1016/j.jcrysgro.2005.12.119