Polarization Imaging for crystallographic orientation of large mercurous halide crystals

Jin, Feng; Kim, Joo-Soo; Kutcher, Susan; Haskovic, E.; Meyers, D.; Soos, Jolanta; Trivedi, Sudhir; Gupta, Neelam

doi:10.1109/aipr.2012.6528206

Cited by 5 publications

(9 citation statements)

References 3 publications

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“…The interactions within the X-Hg-Hg-X molecules are strong covalent bonding (X-Hg) and metal-like bonding of Hg dimers, while the bonds perpendicular to the c direction are weak van der Waals interactions. 27,31,33 Therefore, H 2 X 2 crystals exhibit strong anisotropic physical properties. In addition, the close packed plane of the Hg 2 X 2 is (110) plane, resulting in a severe cleavage nature along the 〈110〉 orientation.…”

Section: Resultsmentioning

confidence: 99%

Single crystal growth and effect of cleavage micro-striations on the crystallinity and optical properties of mercurous halide single crystals

Liu

Yue

et al. 2023

CrystEngComm

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Section: Resultsmentioning

confidence: 99%

Single crystal growth and effect of cleavage micro-striations on the crystallinity and optical properties of mercurous halide single crystals

Liu

Yue

et al. 2023

CrystEngComm

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“…Hg 2 Br 2 crystallizes in a tetragonal crystal system, I4/mmm space group, with the unit cell parameters of a = 4.664 Å and c = 11.130 Å. 28 As shown in Figure 1f, Hg 2 Br 2 is a onedimensional chain structure molecular crystal, in which Br− Hg−Hg−Br molecules were aligned along the ⟨001⟩ orientation. 29,30 The Hg 2 Br 2 single crystal exhibits severe cleavage nature along the ⟨110⟩ orientation.…”

Section: Resultsmentioning

confidence: 99%

Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg₂Br₂ Crystals for Infrared Acousto-Optic Device Application

Lin

et al. 2021

Crystal Growth & Design

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The long-wave infrared acousto-optic tunable filters (AOTFs) based on Hg2Br2 crystals have attracted much interest in space exploration and harmful chemical agent detection. However, the growth of large Hg2Br2 single crystals with high quality and optical homogeneity still remains a challenge, and the lack of temperature-dependent mechanical and thermal properties of this crystal hinders the further enhancement of acousto-optic performance in practical applications. In this context, Hg2Br2 crystals (Φ 35 × 40 mm3) were successfully grown by the physical vapor transport (PVT) method. The optical homogeneity of the as-grown crystal is increased to 7.15 × 10–5 by restraining the impurities, striations, and cracks. In addition, the anisotropic mechanical and thermal properties varying with the temperature of Hg2Br2 crystals were systematically investigated. The compression modulus along the ⟨110⟩ orientation decreases from 17 to 7 GPa in the temperature range of −100 to 150 °C, while it ranges from 5.5 to 1.5 GPa along the ⟨001⟩ orientation. The thermal conductivities along ⟨110⟩ and ⟨001⟩ orientations vary in the range of 1.32–0.52 and 2.06–1.05 W/(m·K) with the increase in temperature from −140 to 100 °C, respectively, and then remain stable in the range of 100–150 °C. Using the first-principles calculation on the electron transfer characteristic between atoms and the bonding property within molecules of Hg2Br2 crystals, the large anisotropic mechanical and thermal properties could be explained, which are mainly attributed to the one-dimensional chain structure of the compound. Notably, the mechanical and thermal properties of Hg2Br2 crystals at low temperature are better than those at high temperature, which guarantees the practical application of AOTFs in a space extreme environment.

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“…Based on all the experimental and simulation results, the proposed model of the Hg 2 Br 2 crystal growth illustrates the evolution of the crystal facets in the center and wall of the ampoule (Figure 4c). It is reasonably acceptable that the Hg 2 Br 2 crystal does not appear to grow in the perfectly vertical direction of the ampoule, but rather in a slightly tilted direction [13]. When the Hg 2 Br 2 phase was grown, individual faceted crystals were formed but the facet on the (001) plane was most preferable.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1a shows the tetragonal lattice structure of the Hg 2 Br 2 crystal with a space group of I4/mmm (139), which comprises strong covalent bonding along the c-axis and relatively weak van der Waals bonds between the adjacent molecules along the ab-plane [15]. The lattice parameters a and c of Hg 2 Br 2 are 4.65 and 11.10 Å, respectively [12,13]. This unique atomic structure causes an optically anisotropic property.…”

Section: Characterization Of Hg 2 Br 2 Crystalmentioning

confidence: 99%

“…In this process, it is important to grow a high-quality AOM single crystal that can be applied to the fabrication of a high-performance AOTF device. For example, Kim et al have reported the study showing the achievement of excellent AOTF performance with the high-quality AOM single crystals [1,3,4,13]. However, most of the corresponding research has focused on the integrated AOTF system rather than AOM crystal growth.…”

Section: Introductionmentioning

confidence: 99%

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In-depth Investigation of Hg2Br2 Crystal Growth and Evolution

Kim

Lee²,

Kang³

et al. 2019

Materials

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Physical vapor transport (PVT) has frequently been adopted for the synthesis of mercurous bromide (Hg2Br2) single crystals for acousto-optic modulators. However, thus far, very few in-depth studies have been conducted that elucidate the growth process of the Hg2Br2 single crystal. This paper reports an in-depth investigation regarding the crystal growth and evolution behavior of the Hg2Br2 crystal with facet growth mode. Based on the experimental and simulation results, the temperature profile conditions concerning the seed generation and seed growth could be optimized. Next, the PVT-grown Hg2Br2 crystals (divided into single crystal and quasi-single crystal regions) were characterized using various analysis techniques. The single-crystal Hg2Br2 was found to possess a more uniform strain than that of the quasi-single crystal through a comparison of the X-ray diffraction data. Meanwhile, the binding energy states and electron backscatter diffraction images of the as-synthesized Hg2Br2 crystals were similar, regardless of the crystal type. Furthermore, Raman spectroscopy and transmission electron microscopy analyses provided information on the atomic vibration mode and atomic structures of the two kinds of samples. The synergistic combination of the simulation and experimental results used to verify the growth mechanism facilitates the synthesis of high-quality Hg2Br2 crystals for potential acousto-optic tunable filter device applications.

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Polarization Imaging for crystallographic orientation of large mercurous halide crystals

Cited by 5 publications

References 3 publications

Single crystal growth and effect of cleavage micro-striations on the crystallinity and optical properties of mercurous halide single crystals

Single crystal growth and effect of cleavage micro-striations on the crystallinity and optical properties of mercurous halide single crystals

Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg₂Br₂ Crystals for Infrared Acousto-Optic Device Application

In-depth Investigation of Hg2Br2 Crystal Growth and Evolution

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Polarization Imaging for crystallographic orientation of large mercurous halide crystals

Cited by 5 publications

References 3 publications

Single crystal growth and effect of cleavage micro-striations on the crystallinity and optical properties of mercurous halide single crystals

Single crystal growth and effect of cleavage micro-striations on the crystallinity and optical properties of mercurous halide single crystals

Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg2Br2 Crystals for Infrared Acousto-Optic Device Application

In-depth Investigation of Hg2Br2 Crystal Growth and Evolution

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Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg₂Br₂ Crystals for Infrared Acousto-Optic Device Application