A new technique for growing single HgI2 crystals

Toubektsis, S. N.; Polychroniadis, E.K.; Economou, N. A.

doi:10.1016/0022-0248(86)90472-0

Cited by 8 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…HgBr 2 crystals were grown by employing the moving vapour growth method [11]. HgBr 2 powder (Sigma reagent) was loaded into a quartz ampoule (10 mm inner diameter, 120 mm length).…”

Section: Growth Of the Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Vapour growth and characterization of HgBr₂crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

Stanciu

Oprica

Oud

et al. 1999

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

HgBr2 single crystals were grown from the vapour by the moving vapour growth method. By optical spectroscopy measurements in the fundamental energy gap region the energy gap value at room temperature RT was determined, and by electrical measurements the energy levels inside the energy gap were resolved. Investigation of the crystals by a photoluminescence technique using a confocal laser scanning microscope using a Kr-Ar laser (488 nm/514 nm) confirmed the presence of internal inhomogeneities and gave information regarding the position and dimension of the impurity regions in the crystals.

show abstract

“…HgBr 2 crystals were grown by employing the moving vapour growth method [11]. HgBr 2 powder (Sigma reagent) was loaded into a quartz ampoule (10 mm inner diameter, 120 mm length).…”

Section: Growth Of the Materialsmentioning

confidence: 99%

“…In the present study single crystals of HgBr 2 were grown from the vapour phase by the moving vapour growth method [11]. The crystals were optically characterized by transmission measurements in the fundamental energy gap region, so the energy gap value was obtained.…”

Section: Introductionmentioning

confidence: 99%

Vapour growth and characterization of HgBr₂crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

Stanciu

Oprica

Oud

et al. 1999

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The growth procedure and the pretreatment of the material have also been reported [4] to be factors that influence the transformation temperature.…”

mentioning

confidence: 99%

A differential scanning calorimetric study on phase transformations of HgI2

Toubektsis

Polychroniadis

1988

Journal of Thermal Analysis

View full text Add to dashboard Cite

A quantitative study of the different factors that influence the ~-fl transformation of mercuric iodide was carried out with differential scanning calorimetry. The transformation temperature and the peak width during the heating of the material were followed. An attempt was made to explain the experimental results.Mercuric iodide (HgI2) undergoes a well-known phase transition at about 130 ~ from the red s-phase to the yellow fl-phase.Although the existence of this ct-fl transformation has been known since the nineteenth century, the transformation temperature has been reported at a great variety of values in the range 125 ~ to 154 ~ This variation was the first indication that the transformation is affected by different factors. In a detailed study, Newkirk [ l ] optically determined the transformation temperature to be 127 ~ From a study of the kinetics of the transformation, he designated the purity and the grain size as factors that affect the ~-fl transformation.A relation has been reported [2,3] between the transformation temperature and the deviation from exact stoichiometry (I/Hg = 2.000). The growth procedure and the pretreatment of the material have also been reported [4] to be factors that influence the transformation temperature.Finally, a more detailed and systematic study [5] proved that the factors that affect the ~-fl transformation are: 1. heating rate, 2. grain size, 3. purity, 4. heating pretreatmentand 5. deviation from stoichiometry. It was found that the growth method indirectly affects the transformation through the impurities that are transported to the grown crystal and this is not considered to be an independent factor.

show abstract

Surface investigations on HgBr₂ single crystals by using confocal scanning laser microscopy

Stanciu

Polychroniadis

2000

Scanning

View full text Add to dashboard Cite

Summary:A confocal scanning laser microscope operating at 514 and 488 nm has been used to obtain two-dimensional (2-D) images of the mercuric bromide (HgBr 2 ) crystal surface by photoluminescence, reflection, and transmission phenomena. Our measurements indicate that regions showing a strong photoluminescence may appear on the surface. By processing the 2-D images, we obtained the threedimensional images, which offer a better possibility for the investigation. The analysis of spectral lines may be correlated with the presence of the Hg impurities.

show abstract

A new technique for growing single HgI2 crystals

Cited by 8 publications

References 14 publications

Vapour growth and characterization of HgBr₂crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

Vapour growth and characterization of HgBr₂crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

A differential scanning calorimetric study on phase transformations of HgI2

Surface investigations on HgBr₂ single crystals by using confocal scanning laser microscopy

Contact Info

Product

Resources

About

A new technique for growing single HgI2 crystals

Cited by 8 publications

References 14 publications

Vapour growth and characterization of HgBr2crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

Vapour growth and characterization of HgBr2crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

A differential scanning calorimetric study on phase transformations of HgI2

Surface investigations on HgBr2 single crystals by using confocal scanning laser microscopy

Contact Info

Product

Resources

About

Vapour growth and characterization of HgBr₂crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

Vapour growth and characterization of HgBr₂crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

Surface investigations on HgBr₂ single crystals by using confocal scanning laser microscopy