Correlation between mercuric iodide detector performance and crystalline perfection

Schieber, M.; Ortale, C.; Berg, L. van den; Schnepple, W.F.; Keller, L.; Wagner, C. N. J.; Yelon, W. B.; Ross, F. K.; Georgeson, Gary; Milstein, Frederick

doi:10.1016/0168-9002(89)91353-3

Cited by 29 publications

(9 citation statements)

References 14 publications

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“…But the energy resolution of the detectors is still depressed by a high concentration of different kind of extended defects easily accomodated in the ~-HgI2 layered lattice. The presence of different extended structural defects was mentioned in some papers [2~], others were devoted to their study [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Extended structural defects in ?-Hgl2 single crystals

Nicolau

Dupuy

Rolland

1993

J Mater Sci: Mater Electron

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Extended structural defects in both ~-Hgl 2 crystals grown in solution or from the vapourphase were studied by optical microscopy, light scattering, SEM operated in cathodoluminescence and in secondary electron mode, X-ray topography, neutron, y-and X-ray rocking curves and oscillating crystal X-ray diffraction. The observed dislocations were compared with theoretically calculated dislocations. Dislocation loops, having diameters ranging from 2 gm to 500 gm, are observed on all low index faces, Hohlstellen (lens-shaped voids) having axes along the [001] direction, less than 1 gm in thickness, and diameters lying in the (001) planes, ranging from 2 gm to 10 gm are characteristic defects. Observed plastic deformations like glide sheets and bands, tilt and twist boundaries, kink and fatigue bands, ridges and rumplings were characterized. Growth rings, spherical void inclusions 10-30 gm in diameter, orthogonal walls of forest screw dislocations parallel to {1 00} planes, and streaks (planar void sheets crossing the (001 ) planes) were only observed in crystals grown from the vapour-phase. Cross-penetration twins having {1 1 4} twin planes are described. The possible formation of stacking faults was analysed. The mosaicity of solution-grown crystals ranges from 1' to 6'. A characteristic cellular structure, having a cell size ranging from 2 I~m to 10 gm, was observed in all the crystals examined and correlated to local deviations from the stoichiometric composition. Solid lens-shaped inclusions, having diameters ranging from 3 gm to 500 gm and thicknesses ranging from 0.3 gm to 50 gm, respectively, are entrapped in many crystals and correlated to spiral hillocks observed on {0 01 } growing faces.

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Section: Introductionmentioning

confidence: 99%

Extended structural defects in ?-Hgl2 single crystals

Nicolau

Dupuy

Rolland

1993

J Mater Sci: Mater Electron

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“…Previous collaboration in high-resolution diffraction imaging of terrestrial mercuric iodide with Lodewijk van den Berg [7], who had grown this material himself in space, had verified the prominence in this material of individual grains, as reported following neutron and gamma-ray diffraction [25] and x-ray topography [12] [26]. A 2-6 µm cellular structure had also been reported [13].…”

Section: B Mercuric Iodidementioning

confidence: 94%

“…Laboratory topography has shown some correlation between grain structure and the performance of detectors, but only in the relatively extreme cases [12]. Unexplained cellular structure with a characteristic dimension of 2-6 µm has been observed in all mercuric iodide by scanning cathodoluminescence microscopy [13].…”

Section: Mercuric Iodidementioning

confidence: 99%

“…All of these observations are consistent with a growth model in which growth begins in the extreme [110) corner of this crystal (in figure 1, for example, this is the top corner) and proceeds relatively uneventfully in the [110) direction (downward in figure 1, for example), or at least in a direction projected onto this direction in the images, until just before the onset of the wide swath of a high density of additional phase features, one of which initiated the sharp lattice twist visible in figures 9,12,16,19,22,25. This twist then propagated for the remainder of the growth.…”

Section: Terrestrial Crystal Compared With Spacelab III Crystalmentioning

confidence: 99%

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High resolution diffraction imaging of crystals grown in microgravity and closely related terrestrial crystals

Steiner

Dobbyn²,

Black³

et al. 1991

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“…They investigated optimal crystal growth [53,54] , purifi cation of starting materials [55] , radiation hardness [56] , and so on. Later, Constellation Technology Corporation continued the HgI 2 single crystalline detector development [57 -59] and Photon Imaging Figure 25.11.…”

Section: P B I 2 and H G I 2 Materialsmentioning

confidence: 99%

Photoconductor Digital X‐Ray Imaging

Zentai

2010

Solar Cells and Their Applications

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Correlation between mercuric iodide detector performance and crystalline perfection

Cited by 29 publications

References 14 publications

Extended structural defects in ?-Hgl2 single crystals

Extended structural defects in ?-Hgl2 single crystals

High resolution diffraction imaging of crystals grown in microgravity and closely related terrestrial crystals

Photoconductor Digital X‐Ray Imaging

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