Journal of Crystal Growth最新文献

{"title":"Ultra-thin epitaxial orthorhombic ferroelectric Hf0.97Y0.03O2 films on La2/3Sr1/3MnO3/SrTiO3 substrate with different orientations","authors":"Qiang Wang ,&nbsp;Haoyan Meng ,&nbsp;Yexuan Guo ,&nbsp;Yankun Wang ,&nbsp;Liyan Dai ,&nbsp;Jinyan Zhao ,&nbsp;Libo Zhao ,&nbsp;Zhuangde Jiang ,&nbsp;Jutta Schwarzkopf ,&nbsp;Shengli Wu ,&nbsp;Lifeng Liu ,&nbsp;Chuanmin Wang ,&nbsp;Zongmin Wang ,&nbsp;Fei Chu ,&nbsp;Yong Wang ,&nbsp;Wei Ren ,&nbsp;Gang Niu","doi":"10.1016/j.jcrysgro.2024.128043","DOIUrl":"10.1016/j.jcrysgro.2024.128043","url":null,"abstract":"<div><div>Ferroelectric hafnium-oxide (HfO₂) films have a great potential for integrated non-volatile memories, neuromorphic computation and micro-electro-mechanical systems (MEMS), thanks to its compatibility with mainstream semiconductor fabrication process. However, the high-quality ferroelectric single-crystal HfO₂ films, deemed as the consequence of the non-centrosymmetric orthorhombic o (111) phase, are still challenging to be reliably prepared. It is because various phase structures like monoclinic phase, tetragonal phase or cubic phase are possible to be formed accompanying with orthorhombic o (111) phase. The crystalline phase of HfO₂ is related to the doping, the lattice strain, the film thickness and the orientation of substrate, however the comprehensive understandings of different factors are still lacking. We report in this work the growth and optimization of o (1<!--> <!-->1<!--> <!-->1) phase Y-doped HfO₂ (HYO) films deposited on La_2/3Sr_1/3MnO₃/SrTiO₃ and comprehensively clarify the influence of the substrate orientation, the film thickness, and the oxygen pressure on crystal behaviors of HYO films. By comparing HYO/STO (0<!--> <!-->0<!--> <!-->1) with HYO/STO (0<!--> <!-->1<!--> <!-->1) systems, this work reports an insight into the orientation-dependent epitaxial relation, interplanar spacing, lattice constant and ferroelectric properties of o-HfO₂ (1<!--> <!-->1<!--> <!-->1) films. Eventually, an ultra-thin ∼5.5 nm epitaxial single-crystal o-HYO (1<!--> <!-->1<!--> <!-->1) film with a large ferroelectric polarization of ∼35.9 μC cm⁻² was obtained using LSMO/STO (0<!--> <!-->1<!--> <!-->1) substrate. These results are of great significance for the preparation and realization of high-quality epitaxial single-crystal ferroelectric o-HYO (1<!--> <!-->1<!--> <!-->1) ultra-thin films.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128043"},"PeriodicalIF":1.7,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manufacturing of Ag/Ag2O nanocomposites for anti-quorum sensing: A Safe and green approach","authors":"Hatice Aysun Mercimek Takcı ,&nbsp;Deniz Kadir Takcı ,&nbsp;Sedef Icigen ,&nbsp;Hasim Ozkan ,&nbsp;Sabri Erdi Duman ,&nbsp;Tahsin Huner","doi":"10.1016/j.jcrysgro.2024.128041","DOIUrl":"10.1016/j.jcrysgro.2024.128041","url":null,"abstract":"<div><div>Green synthesis of silver nanoparticles is the most phenomena topic that has affected all aspects of nanotechnology research, especially modern material sciences. The current study focuses on using endemic <em>Hypercium capitatum</em> in silver nanocomposite synthesis and investigating quorum quenching effects on <em>Choromobacter violaceum</em> and <em>Pseudomonas aeruginosa.</em> The strong absorption SPR peak appeared at about 432 nm. The optical bandgap of Ag/Ag₂O nanocomposites was predicted as about 1.95 eV by Tauc’s plot equation. The size distribution of Ag/Ag₂O nanocomposites with spherical shape ranged from 20.55 nm to 30.76 nm by SEM images. XRD findings confirmed the pure crystalline nature of biogenic Ag/Ag₂O nanocomposites with an average 30 nm size. FTIR spectrum indicated the presence of bioactive functional components responsible for the bioreduction of bulk AgNO₃ to Ag/Ag₂O nanocomposites<strong>.</strong> The Ag/Ag₂O nanocomposites effectively inhibited the pyocyanin and violacein-producing controlled by quorum sensing. This could be a promising achievement in a struggle with many persistent and dynamic pathogens.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128041"},"PeriodicalIF":1.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation and breakage of chain-like in preparation of nano-sized precipitated calcium carbonate","authors":"Zhiqin Huang ,&nbsp;Yuanzhen Huang ,&nbsp;Aimei Yang ,&nbsp;Xiuling Ma ,&nbsp;Yong Zhu ,&nbsp;Juying Zhou ,&nbsp;Lixian Sun ,&nbsp;Fen Xu ,&nbsp;Siyue Wei","doi":"10.1016/j.jcrysgro.2024.128010","DOIUrl":"10.1016/j.jcrysgro.2024.128010","url":null,"abstract":"<div><div>Nano-precipitated calcium carbonate (NPCC) exhibits multiple morphologies and unique properties to satisfy various requirements in industry. In this study, monodisperse and cubic NPCC were prepared by a solution mixing method using NaOH, Na₂CO₃, and CaCl₂ as raw materials. The morphology of CaCO₃ was controlled by the amount of NaOH in the precipitation process. X-ray diffraction (XRD), and scanning electron microscope (SEM) were employed for characterizations of CaCO₃. The formation and the subsequent fission of nanofibril-like CaCO₃ played an important role in the stages of NPCC preparation. The effects of pH, Ca²⁺, and Mg²⁺ concentration on the fission process were studied. The results indicate that the low pH, low Ca²⁺, and Mg²⁺ ions concentrations are beneficial to the fission of nanofibril-like CaCO₃, and the correlation mechanism is proposed.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128010"},"PeriodicalIF":1.7,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth and spectroscopic properties of Yb and Nd ions doped Ca3Li0.275Nb1.775Ga2.95O12 (CLNGG) laser crystals","authors":"Xuhong Li ,&nbsp;Zhaojie Zhu ,&nbsp;Jianfu Li ,&nbsp;Chaoyang Tu ,&nbsp;Yan Wang","doi":"10.1016/j.jcrysgro.2024.128029","DOIUrl":"10.1016/j.jcrysgro.2024.128029","url":null,"abstract":"<div><div>A series of CLNGG crystals doped with varying concentrations of Yb³⁺ and Nd³⁺ were successfully grown by the Czochralski method. The structural and physical properties of the grown crystals were systematically characterized. The Raman spectra of the crystals revealed the influence of Yb³⁺ and Nd³⁺ on the local structure. The Yb:CLNGG crystals exhibited a narrow peak at 943 nm, with the full widths at half maximum (FWHM) of ∼ 37 nm, and the absorption cross-sections for 1 at.%, 5 at.% and 10 at.% Yb doping were 3.84 × 10⁻²¹ cm², 5.79 × 10⁻²¹ cm², and 5.83 × 10⁻²¹ cm², respectively, which were suitable for the commercially available (InGaAs/GaAs) pump sources. The Nd:CLNGG crystals exhibited an absorption peak at 808 nm with the FWHM of ∼10 nm. The absorption cross-sections for 1 at.%, 5 at.% and 10 at.% Nd doping were 4.616 × 10⁻²⁰ cm², 3.461 × 10⁻²⁰ cm², and 3.211 × 10⁻²⁰ cm², respectively, making them well-suited for (AlGaAs/GaAs) commercial laser pump sources. The infrared fluorescence spectra of the crystals were also studied. Among Yb:CLNGG crystals, an increasing Yb concentration enhanced the emission intensities at 1026 nm, reaching the maximum FWHM of 40 nm, while the fluorescence lifetimes became longer. Conversely, for Nd:CLNGG crystals, as the Nd ions increased, the emission intensities at 1060 nm decreased, and the lifetimes shortened. The Yb³⁺ and Nd³⁺ doped CLNGG crystals are expected to achieve ultrashort mode-locked and high-energy laser output in the near-infrared band.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128029"},"PeriodicalIF":1.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A theoretical investigation into the solvent effect on crystal morphology of Nintedanib Esylate by molecular dynamic simulations and experiments","authors":"Jinju Ma ,&nbsp;Mengqi Tian ,&nbsp;Zhengyang Xi ,&nbsp;Wei Liu ,&nbsp;Xinding Yao ,&nbsp;Baozeng Ren","doi":"10.1016/j.jcrysgro.2024.128027","DOIUrl":"10.1016/j.jcrysgro.2024.128027","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Solvent effects play a crucial role in determining the crystal structure of substances obtained from solution. Choosing the appropriate solvent system is vital for the formation of active pharmaceutical ingredients with optimal crystallization characteristics. In this work, the crystal morphology of Nintedanib Esylate under 10 pure solvent conditions was explored using molecular dynamic simulations and experiments. Single crystals of Nintedanib Esylate were prepared by slow evaporation crystallization, and the single crystal structure of Nintedanib Esylate obtained in methanol solvent was determined using single-crystal X-ray diffraction. The results indicated that the crystal form of Nintedanib Esylate was consistent throughout the study. Through structural analysis of the single crystal, it was determined that nintedanib ethosylate is a channel-type hemihydrate with a porosity of 14.8%. The molecular connectivity sites within the crystal were analyzed, and the periodic arrangement trends of the molecules within the nintedanib ethosylate crystal were explored through 2D and 3D structural diagrams. Hirshfeld surface analysis was used to investigate the intermolecular interactions in the crystal structure. The results showed that there are five main types of interactions in the nintedanib ethosylate crystal, namely H···H interactions, O···H/H···O interactions, C···H/H···C interactions, N···H/H···N interactions, and S···H interactions. Among them, H···H interactions accounted for 53.9%, while the S···H interaction was the weakest, contributing only 0.2%. The H···H interactions, representing van der Waals forces, play a dominant role in promoting the formation of the nintedanib ethosylate crystal.Based on the single crystal data of Nintedanib Esylate, the attachment energy model was used to predict the crystal morphology of NE under vacuum conditions. Five major crystal planes were identified, namely {0 0 1}, {0 1 0}, {0 1 1}, {1 0 0}, and {1 1 0}, with the {0 0 1} plane having the largest surface area, accounting for approximately 32.57% of the total crystal surface area.The modified attachment energy model was used to predict the crystal morphology of Nintedanib Esylate in different solvents. The results showed that the modified attachment energy model predictions were consistent with the crystal habits obtained by evaporative crystallization, and it was predicted that the aspect ratio of the simulated crystal habit was smallest in methanol, isopropanol, and n-propanol, and largest in n-butanol and ethanol, which can be used for further optimization of crystallization processes and solvent selection for production.The diffusion ability of solvent molecules on the crystal surface is the key factor to determine the crystal growth rate. The dominant crystal surface {0 1 0} in ethanol, isopropanol, acetone, DCM and DMF solvent systems and the dominant crystal surface {1 1 0} in n-propanol solvent system have the largest diffusion coefficient","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128027"},"PeriodicalIF":1.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective area molecular beam epitaxial growth of n-GaN nanowires on SiO2 hole-mask patterned sapphire and graphene substrates","authors":"Yang Li,&nbsp;Tron Arne Nilsen,&nbsp;Gulzhan Baigarinova,&nbsp;Anjan Mukherjee,&nbsp;Dingding Ren,&nbsp;Andreas Liudi Mulyo,&nbsp;Helge Weman,&nbsp;Bjørn-Ove Fimland","doi":"10.1016/j.jcrysgro.2024.128028","DOIUrl":"10.1016/j.jcrysgro.2024.128028","url":null,"abstract":"<div><div>The growth conditions of silicon-doped GaN (n-GaN) nanowire (NW) selective area growth (SAG) are explored using plasma-assisted molecular beam epitaxy on SiO₂ hole-mask patterned substrates: sapphire (SAP) and graphene on SAP (GoS). To achieve high selectivity, the growth temperature and Ga flux windows in which the nucleation on the SiO₂ mask is highly suppressed are investigated and found to be quite narrow. By tuning the mask etching process, n-GaN NW morphologies ranging from vertical and widely separated NWs grown through SiO₂ pinholes to densely positioned NWs with coalesced upper surface in wider mask holes are demonstrated on SAP.</div><div>Using optimized growth conditions for SAG on SAP substrates, successful growth of vertical n-GaN NWs was achieved on similarly hole-mask patterned GoS substrates. Micro-Raman spectra indicate that the graphene is well protected from the nitrogen plasma by the SiO₂ mask, whereas the graphene is damaged in the holes of the mask. X-ray diffraction spectra reveal an epitaxial relationship with the SAP and resistance measurements show conductivity between NWs of different mask holes. From this, we conclude that n-GaN NWs after nucleating on SAP through nanoholes in the graphene overgrow it and that this part of the graphene, at least close to the edge of the hole areas, can conduct well to the SiO₂ mask covered graphene, indicating that graphene in such configuration can be used as a bottom electrode in a device structure. The impact of Ga diffusion and desorption on SAG is demonstrated for growth temperatures of 810 and 815 °C for SiO₂ hole-mask patterns with nominal hole diameter of 2.5 µm and hole pitches of 3.0–10.0 µm. For hole pitches above 5 µm, Ga diffusion from the mask is the major contribution to the NW growth.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128028"},"PeriodicalIF":1.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertical Bridgman growth of 2-methoxy benzoic acid single crystal: A promising approach for nonlinear optical applications","authors":"Kuriakose Jithin,&nbsp;P. Karuppasamy,&nbsp;M. Senthil Pandian,&nbsp;P. Ramasamy","doi":"10.1016/j.jcrysgro.2024.128025","DOIUrl":"10.1016/j.jcrysgro.2024.128025","url":null,"abstract":"<div><div>Organic optical crystals hold a pivotal role in the field of nonlinear optical (NLO) applications. This research paper focuses on the exploration of 2-methoxy benzoic acid (2MBA) (CH₃OC₆H₄CO₂H) as a potential NLO candidate. We explored the vertical Bridgman technique to grow a 2MBA organic single crystal. The multi-nucleation was arrested by the small bend made at the bottom of the ampoule. Through rigorous optimization procedures, the ampoule geometry and the furnace’s thermal profile were meticulously tailored to achieve optimal conditions for crystal growth. A good optical quality single crystal has been grown successfully. The lattice parameters of the crystal have been investigated by single crystal XRD measurement. The crystal phase was determined by Powder X-ray Diffraction (PXRD) analysis. Fourier transform infrared spectroscopy (FTIR) analysis was conducted to determine the functional groups of the 2MBA molecule. The optical transmittance has been examined by UV–visible-NIR spectroscopy.<!--> <!-->The grown crystal shows more than 85 % transmittance in the visible region. The cut-off wavelength of the grown crystal is 340 nm, and the optical band gap energy of 2MBA was found to be 3.5 eV. A photoluminescence (PL) study was conducted to determine the emission spectrum of the grown crystal. The thermal stability of the 2MBA crystal was investigated by TGA-DTA analysis, revealing the melting point of 108 °C. The photocurrent study indicates that 2MBA exhibits positive photoconductivity. Third-order nonlinear parameters were obtained using the Z-scan technique, with the calculated value of <span><math><mrow><mtable><mtr><mtd><mfenced><mrow><msup><mi>χ</mi><mfenced><mrow><mn>3</mn></mrow></mfenced></msup></mrow></mfenced></mtd></mtr></mtable></mrow></math></span> being 1.013 × 10⁻⁸ <span><math><mtext>esu</mtext></math></span>. The outcomes of the tests conducted confirm that the grown 2MBA has exceptional capability for nonlinear optical applications.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128025"},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modification of molybdate flux with LiF for LiB3O5 crystal growth","authors":"Elona Khan ,&nbsp;Valery Ryabov ,&nbsp;Maria Samoilova ,&nbsp;Ekaterina Simonova ,&nbsp;Konstantin Kokh","doi":"10.1016/j.jcrysgro.2024.128026","DOIUrl":"10.1016/j.jcrysgro.2024.128026","url":null,"abstract":"<div><div>The present study concerns the Li₂O-B₂O₃-MoO₃-LiF system. LiB₃O₅ and Li₃B₇O₁₂ crystals were obtained by spontaneous crystallisation and TSSG. The addition of LiF to the molybdate flux represents a promising avenue for the growth of lithium borate crystals.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128026"},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facile synthesis of WO3.H2O nanostructures for efficient photocatalytic and electrochemical properties","authors":"Sana Islam ,&nbsp;Imran Aslam ,&nbsp;Tariq Mahmood ,&nbsp;M. Hassan Farooq","doi":"10.1016/j.jcrysgro.2024.128017","DOIUrl":"10.1016/j.jcrysgro.2024.128017","url":null,"abstract":"<div><div>WO₃·H₂O nanostructures have fascinated momentous consideration due to their distinctive properties such as small bandgaps as compared to WO₃, tunable morphology, and distinct photocatalytic properties. These nanostructures were successfully fabricated by the hydrothermal method (by varying solvent volume) and characterized by X-ray diffraction (XRD), EDX, and FESEM to analyze the crystallinity, chemical composition, and morphology which indicated the average size of 140–190 nm. The presence of O-W-O and O = W chemical bonds, and O–H stretching vibrations in FTIR spectrum demonstrate the fabrication of WO₃·H₂O nanostructures. The UV–Visible spectroscopy and PL study were conducted which presented that the optical bandgaps lies in the range (2.16–2.5 eV) which were beneficial for photocatalytic activity. To assess the photocatalytic response, rhodamine B, methyl orange, reactive orange 16 dyes and additionally industrial wastewater were used. It was noted that the photodegradation efficiency of sample 1 was higher than other samples for all dyes. The percentage degradation for RhB (99.5 %), MO (97.5 %), RO16 (88.7 %), and IW (99.5 %) and the reaction rate constants are RhB (0.0768 min⁻¹), MO (0.03991 min⁻¹), RO16 (0.02363 min⁻¹), and IW (0.0744 min⁻¹). The sample 1 have 1.5 times higher photocatalytic properties than all other samples, attributed to its lowest bandgap 2.16 eV, and lower charge carriers recombination rate. Moreover, the electrochemical properties of WO₃·H₂O nanostructures were also evaluated presenting a specific capacitance of 1209F g⁻¹. This analysis highlights their potential in environmental remediation and supercapacitor applications.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128017"},"PeriodicalIF":1.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth and optimization of the scintillation properties of Gd3(Ga,Al)5O12 single crystals for WGI applications","authors":"Kyoung Jin Kim ,&nbsp;Kei Kamada ,&nbsp;Yoshiyuki Usuki ,&nbsp;Eiji Yoshida ,&nbsp;Yasuhiro Shoji ,&nbsp;Han Gyu Kang ,&nbsp;Go Akamatsu ,&nbsp;Taiga Yamaya ,&nbsp;Akira Yoshikawa","doi":"10.1016/j.jcrysgro.2024.128014","DOIUrl":"10.1016/j.jcrysgro.2024.128014","url":null,"abstract":"<div><div>A new scintillator was developed as a scatterer for whole gamma imaging (WGI). The WGI scatterer is required to meet simultaneously three main characteristics: energy resolution of 5.5 % or less, light yield of 40,000 photons/MeV or greater, and a decay time of 100 ns or shorter. Several scintillators were selected and evaluated from previously grown single crystals, leading to the selection of a candidate scintillator crystal as the basis for optimization, with energy resolution being the primary focus. Based on the selected crystal composition, large single crystals were grown via the Czochralski method. The Ga/Al ratio in the GAGG-type host crystal, along with the Mg co-doping concentration, was systematically adjusted to achieve optimal properties. The optimized crystal exhibited scintillation properties with an energy resolution of 5.28 % at 662 keV, a light yield of 45,200 photons/MeV, and a decay time of 92 ns. After evaluating their characteristics by manufacturing them in a 4 × 4 array, the single crystals used in the production of a full-block array (14 × 14) for the scatterers were finally selected. Subsequently, the crystals were employed to construct a full-block array, which demonstrated energy resolution nearly identical to that of the 4 × 4 array. No observable performance degradation was evident even in the larger array configuration. These array blocks, produced using the optimized crystals, are being tested by applying them to a WGI prototype system at the National Institutes for Quantum Science and Technology in Chiba, Japan.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128014"},"PeriodicalIF":1.7,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}