Alternating Metastable/Stable Pattern in the Mercuric Iodide Crystal Formation Outside the Ostwald Rule of Stages

2014 ◽  
Vol 118 (36) ◽  
pp. 7725-7731 ◽  
Author(s):  
Mahmoud M. Ayass ◽  
Andrew Abi Mansour ◽  
Mazen Al-Ghoul
Keyword(s):  
Crystal Formation ◽  
Mercuric Iodide ◽  
Stable Pattern ◽  
Iodide Crystal

Far-i.r. reflection spectrum and normal vibrations of red mercuric iodide crystal

1976 ◽  
Vol 32 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Yoshiki Ogawa ◽  
Issei Harada ◽  
Hiroatsu Matsuura ◽  
Takehiko Shimanouchi
Keyword(s):  
Reflection Spectrum ◽  
Mercuric Iodide ◽  
Normal Vibrations ◽  
Iodide Crystal

Gravitational Effects on Mercuric Iodide Crystal Growth

1998 ◽  
Vol 551 ◽  
Author(s):  
Bruce Steiner ◽  
Lodewijk Van Den Berg ◽  
Uri Laor
Keyword(s):  
Crystal Growth ◽  
Mercuric Iodide ◽  
Gravitational Effects ◽  
Vapor Growth ◽  
Turn On ◽  
Electronic Performance ◽  
Diffraction Imaging ◽  
Characterization Studies ◽  
And Performance ◽  
Iodide Crystal

AbstractGravity can affect the physical vapor growth of mercuric iodide in two distinct ways. First, gravity will induce convection during growth, which strongly mixes residual impurities and any elementary gases resulting from imperfect stoichiometry, either of which can then form precipitates in the growing crystal. Second, gravity loads the resulting crystal, which is particularly soft while still hot, especially in the absence of precipitates. We have investigated the effects of these processes on the resulting crystalline regularity and the effects of various types of irregularity, in turn, on performance.High resolution synchrotron x-radiation diffraction imaging of three generations of crystals, grown both in microgravity and in full gravity, provide graphic evidence of the influence of gravity on mercuric iodide crystal growth. These images tie together the results of other characterization studies, identifying the crystallographic sources of the observed property enhancement in microgravity. The first process, convection, is found to be particularly important, both in its influence on observed crystalline regularity and in the resulting electronic performance of detectors made from these crystals.As a result of these investigations, the crystalline regularity and performance of terrestrial crystals has been substantially improved, although the resulting crystals have not yet achieved parity with the performance of crystals grown in microgravity. We propose new experiments in microgravity for property optimization.

Mercuric Iodide Crystal Growth and Frisch Collar Detector Fabrication

2011 ◽  
Vol 175 (1) ◽  
pp. 124-130 ◽  
Author(s):  
E. Ariesanti ◽  
A. Kargar ◽  
D. S. McGregor
Keyword(s):  
Crystal Growth ◽  
Mercuric Iodide ◽  
Iodide Crystal

scholarly journals X-Ray Analysis of Alpha Mercuric Iodide Crystal Structure and Processing Effects

1993 ◽  
Vol 302 ◽  
Author(s):  
L. Keller ◽  
E.X. Wang ◽  
A.Y. Cheng
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Linear Thermal Expansion ◽  
Device Fabrication ◽  
Mercuric Iodide ◽  
Rocking Curve ◽  
X Ray ◽  
Processing Effects ◽  
Crystal Damage ◽  
Iodide Crystal

ABSTRACTX-ray topography and rocking curve experiments were performed on α-mercuric iodide samples. As-grown crystals were examined for intrinsic defects and crystallinity. Orientation of certain defects depends on the direction of crystal growth. The propagation of as-grown crystalline features was documented. The extent of crystal damage introduced during various steps of device fabrication such as sawing, polishing, etching and contact deposition was explored. Coefficients of linear thermal expansion of α33 = 54 ± 5 (10−6/°C) along the tetragonal c-axis, \001] direction and ±ll = 11 ± 4 (10−6/°C) in the \100] direction were measured.

Optical diagnostics of mercuric iodide crystal growth

1991 ◽  
Author(s):  
Arnold Burger ◽  
Steven H. Morgan ◽  
Enrique Silberman ◽  
Donald Nason
Keyword(s):  
Crystal Growth ◽  
Optical Diagnostics ◽  
Mercuric Iodide ◽  
Iodide Crystal

The Critical Point Drying Method Applied to Scanning Electron Microscopy of L-929 Cells

1970 ◽  
Vol 28 ◽  
pp. 278-279
Author(s):  
Charles TurnbiLL ◽  
Delbert E. Philpott
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Surface Tension ◽  
Critical Point ◽  
Freeze Drying ◽  
Attractive Alternative ◽  
Crystal Formation ◽  
Critical Point Drying ◽  
Time Required ◽  
Scanning Electron

The advent of the scanning electron microscope (SCEM) has renewed interest in preparing specimens by avoiding the forces of surface tension. The present method of freeze drying by Boyde and Barger (1969) and Small and Marszalek (1969) does prevent surface tension but ice crystal formation and time required for pumping out the specimen to dryness has discouraged us. We believe an attractive alternative to freeze drying is the critical point method originated by Anderson (1951; for electron microscopy. He avoided surface tension effects during drying by first exchanging the specimen water with alcohol, amy L acetate and then with carbon dioxide. He then selected a specific temperature (36.5°C) and pressure (72 Atm.) at which carbon dioxide would pass from the liquid to the gaseous phase without the effect of surface tension This combination of temperature and, pressure is known as the "critical point" of the Liquid.

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