A study of the homogeneity and deviations from stoichiometry in mercuric iodide

Bürger, A.; Morgan, S. H.; He, Chaoyu; Silberman, E.; Ortale, C.; Franks, L.A.; Schieber, M.

doi:10.1016/s0022-0248(08)80068-1

Cited by 31 publications

(10 citation statements)

References 13 publications

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“…and resonance fluorescence spectroscopy. 17 However, the prevalence of the various anomalies observed, their precise nature in various crystals, and the influence of each on performance have remained unclear. Their origins and any interrelationships have proved elusive as well.…”

Section: B Preceding Structural Informationmentioning

confidence: 99%

“…However more recently, after extensive purification of the crystal growth starting materials, second generation mercuric iodide crystals with reduced levels of inclusions were grown. 17 In similar first generation wafers examined by scanning cathodoluminescence microscopy, 23 the spectroscopic signatures appear to be concentrated in small ͑Ϸ5 m͒ cells. X-ray diffraction concentrated in similar regions can be observed in some of the diffraction images, for example the upper half of Fig.…”

Section: A First Generation Terrestrial Wafermentioning

confidence: 99%

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Enhancement of mercuric iodide detector performance through increases in wafer uniformity by purification and crystal growth in microgravity

Steiner

Laor

1999

Journal of Applied Physics

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Wafers from mercuric iodide crystals grown in microgravity on two occasions have previously been found to be characterized by a higher hole mobility-lifetime product, which enables energy dispersive radiation detectors with superior resolution. In the present work, we have identified the specific structural modifications that are responsible for this enhanced performance. As a result of this study, the performance of terrestrial wafers also has been improved but not yet to the level of wafers grown in microgravity. High resolution synchrotron x-ray diffraction images of a series of wafers, including those grown both in microgravity and on the ground, reveal two principal types of structural changes that are interrelated. One of these, arrays of inclusions, affects performance far more strongly than the other, variation in lattice orientation. Inclusions can be formed either from residual impurities or in response to deviations from ideal stoichiometry. The formation of both types is facilitated by gravity-driven convection during growth. As the level of inclusions is reduced, through growth from material of higher purity, through the achievement of balanced stoichiometry, or by suppression of convection mixing during crystal growth, the hole mobility-lifetime product is enhanced in spite of an accompanying decreased uniformity in lattice orientation. Sixfold enhancement in the performance of x-and ␥-ray detectors has been accomplished to date. Further augmentation in performance appears likely.

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Section: B Preceding Structural Informationmentioning

confidence: 99%

Section: A First Generation Terrestrial Wafermentioning

confidence: 99%

Enhancement of mercuric iodide detector performance through increases in wafer uniformity by purification and crystal growth in microgravity

Steiner

Laor

1999

Journal of Applied Physics

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“…However, growing single crystals with homogeneous and reproducible detection performances turned to be a very difficult task [14][15][16][17][18]. Besides, single crystals of HgI 2 are limited in size (at most 2-3 cm) [19] and thus unsuitable for large area detectors.…”

Section: Introductionmentioning

confidence: 99%

Textured α-HgI2 ceramics for sensitive X-ray detection

Rault

Binet

Gourier

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…Mercuric iodide undergoes a solid-solid phase transition from a tetragonal red phase (a-HgI 2 ) to an orthorhombic yellow phase (b-HgI 2 ) at 127 1C [9,10]. Thus, to obtain high-quality polycrystalline a-HgI 2 thick films, the temperature of the substrate should be controlled below 127 1C.…”

Section: Introductionmentioning

confidence: 99%