High Purification of Hg2Br2 Powder for Acousto-Optic Tunable Filters Utilizing a PVT Process

김태현,; 이희태,; 권인회,; 강영민,; 우시관,; 장건익,; 조병진,; Kim, Tae Hyeon; Lee, Hee Tae; Kwon, In Hoi; Kang, Young-Min; Woo, Shi-Gwan; Jang, Gun–Eik; Cho, Byungjin

doi:10.3740/mrsk.2018.28.12.732

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…The purification process of the powder was conducted by PVT at 300 • C for 10 h under the vacuum sealing condition and then the chamber was slowly cooled at a rate of 1 • C/min to prevent the formation of Hg metal or the corresponding secondary phases. The finally purified Hg 2 Br 2 powder showed an extremely high 5 N purity of 99.999%, which was analyzed by inductively coupled plasma atomic emission spectroscopy, as reported in the previous work [14].…”

Section: Purification Process Of Hg 2 Br 2 Powdersmentioning

confidence: 79%

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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Section: Purification Process Of Hg 2 Br 2 Powdersmentioning

confidence: 79%

In-depth Investigation of Hg2Br2 Crystal Growth and Evolution

Kim

Lee²,

Kang³

et al. 2019

Materials

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Annealing modification and defect analysis of Hg2Br2 crystal

Liu

Yue

et al. 2023

Ceramics International

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Physical Vapor Transport Process for Highly Purified Hg2Br2 Crystal: from Powder Purification to Crystal Growth

Kwon¹,

Song²,

Woo³

et al. 2022

Korean J. Met. Mater.

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High quality Hg2Br2 crystal grown <i>via</i> the physical vapor transport (PVT) process is essential for the fabrication of the acousto-optic tunable filters (AOTFs) module. The full process flow, including powder purification and crystal growth, should be systematically established, but there have been few reports about the fully established process flow of single Hg2Br2 crystal. In this study, we report on the entire process, from purification of the Hg2Br2 powder to crystal growth based on the PVT process. We compared the raw powder and purified powder using X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma (ICP). Although there was no considerable difference in the XRD and XPS results of the powders before/after purification, the ICP impurity analysis indicated that the purity of Hg2Br2 powder increased from 4N (99.99%) to 5N (99.999%). The Hg2Br2 single crystal grown by the PVT process was then fully characterized by XRD, XPS, and Raman spectroscopy. The vibration bonds constituting the Hg2Br2 lattice were clearly identified from the Raman spectra of the final Hg2Br2 crystal. High quality Hg2Br2 single crystal PVT-grown from the purified powder will lead to the development of a high-performance acousto-optic module. Establishing the systematic growth sequence of the Hg2Br2 based on PVT paves the way to promising AOTF modules.

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High Purification of Hg2Br2 Powder for Acousto-Optic Tunable Filters Utilizing a PVT Process

Cited by 4 publications

References 14 publications

In-depth Investigation of Hg2Br2 Crystal Growth and Evolution

In-depth Investigation of Hg2Br2 Crystal Growth and Evolution

Annealing modification and defect analysis of Hg2Br2 crystal

Physical Vapor Transport Process for Highly Purified Hg2Br2 Crystal: from Powder Purification to Crystal Growth

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