Crystals最新文献_第3页

Crystal Growth of LiNa5Mo9O30 Crystals of High Optical Quality 高光学质量 LiNa5Mo9O30 晶体的晶体生长

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-07 DOI: 10.3390/cryst14090792

Nikolai Khokhlov, Ivan Grishchenko, Ekaterina Shevelkina, Denis Bindyug, Ekaterina Barkanova, Dmitry Denisov, Dmitry Demushkin, Ivan Telegin, Ekaterina Yezhikova, Igor Avetissov, Roman Avetisov, Alexey Konyashkin, Oleg Ryabushkin

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In Situ Synthesis and Characterization of Graphitic Carbon Nitride/Metakaolin Composite Photocatalysts Using a Commercial Kaolin 使用商用高岭土原位合成氮化石墨碳/偏高岭土复合光催化剂并确定其特性

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-07 DOI: 10.3390/cryst14090793

Balázs Zsirka, Orsolya Fónagy, Veronika Vágvölgyi, Tatjána Juzsakova, Lajos Fodor, Csilla Őze

{"title":"In Situ Synthesis and Characterization of Graphitic Carbon Nitride/Metakaolin Composite Photocatalysts Using a Commercial Kaolin","authors":"Balázs Zsirka, Orsolya Fónagy, Veronika Vágvölgyi, Tatjána Juzsakova, Lajos Fodor, Csilla Őze","doi":"10.3390/cryst14090793","DOIUrl":"https://doi.org/10.3390/cryst14090793","url":null,"abstract":"Kaolin-based graphitic carbon nitride (g-CNx) composite photocatalysts were synthesized from a urea precursor using a commercial kaolin. Structural characterization by X-ray diffraction and infrared spectroscopy (FTIR) verified the successful thermal polycondensation of g-CNx along the thermal dehydroxylation of kaolinite to metakaolin at 550 °C. The g-CNx content of the composites were estimated by thermogravimetry and CHN analysis, ranging from ca. 87 m/m% to ca. 2 m/m% of dry mass. The addition of kaolin during the composite synthesis was found to have a significant effect: the yield of in situ formed g-CNx drastically decreased (from ca. 4.9 m/m% to 3.8–0.1 m/m%) with increasing kaolin content. CHN and FTIR indicated the presence of nitrogen-rich g-CNx, having a specific surface area of 50 m2/g, which synergistically increased after composite synthesis to 67–82 m2/g. Estimated optical band gaps indicated the affinity to absorb in the visible light spectrum (λ < 413 nm). Photocatalytic activity upon both UV and artificial sunlight irradiation was observed by hydroxyl radical evolution, however, without the synergistic effect expected from the favorable porosity.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"14 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202506","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}

引用次数: 0

Fabrication and Characterization of Fe-Doped SnSe Flakes Using Chemical Vapor Deposition 利用化学气相沉积法制造掺铁硒化物薄片并确定其特性

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-06 DOI: 10.3390/cryst14090790

Florinel Sava, Claudia Mihai, Angel-Theodor Buruiana, Amelia Elena Bocirnea, Alin Velea

{"title":"Fabrication and Characterization of Fe-Doped SnSe Flakes Using Chemical Vapor Deposition","authors":"Florinel Sava, Claudia Mihai, Angel-Theodor Buruiana, Amelia Elena Bocirnea, Alin Velea","doi":"10.3390/cryst14090790","DOIUrl":"https://doi.org/10.3390/cryst14090790","url":null,"abstract":"The development of two-dimensional (2D) materials has gained significant attention due to their unique properties and potential applications in advanced electronics. This study investigates the fabrication and characterization of Fe-doped SnSe semiconductors using an optimized chemical vapor deposition (CVD) method. Fe doping was achieved by dissolving FeCl3 in deionized water, applying it to SnSe powder, and conducting vacuum drying followed by high-temperature CVD at 820 °C. Structural and morphological properties were characterized using optical microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). Results revealed differently shaped flakes, including rectangles, discs and wires, influenced by Fe content. Micro-Raman spectroscopy showed significant vibrational mode shifts, indicating structural changes. X-ray photoelectron spectroscopy (XPS) confirmed the presence of Sn-Se and Fe-Se bonds. Electrical characterization of the memristive devices showed stable switching between high- and low-resistance states, with a threshold voltage of 1.6 V. These findings suggest that Fe-doped SnSe is a promising material for non-volatile memory and neuromorphic computing applications.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"28 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202508","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}

引用次数: 0

A Review of Deep-Red (650–700 nm)-Emitting Semiconductor Nanocrystals 深红（650-700 纳米）发射半导体纳米晶体综述

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-05 DOI: 10.3390/cryst14090788

Geyu Jin, Fangze Liu, Jing Wei, Hongbo Li

引用次数: 0

Investigations of Some Disordered Quaternary Compounds in the Systems Ag/Pb/Sb/Se and Ag/Pb/Sb/Te 对 Ag/Pb/Sb/Se 和 Ag/Pb/Sb/Te 体系中一些无序季化合物的研究

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-05 DOI: 10.3390/cryst14090789

Maxim Grauer, Christopher Benndorf, Valentin Rohr, Carsten Paulmann, Oliver Oeckler

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Mössbauer Studies of Haltern 70 Amphorae from Castro do Vieito, Northwest of Portugal 葡萄牙西北部 Castro do Vieito 出土的 Haltern 70 安福拉的莫斯鲍尔研究

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-04 DOI: 10.3390/cryst14090786

Benilde F. O. Costa, Friedrich E. Wagner, Werner Häusler, Christian Stieghorst, António José Marques da Silva

引用次数: 0

All-Optical Switching Using Cavity Modes in Photonic Crystals Embedded with Hyperbolic Metamaterials 利用嵌入双曲超材料的光子晶体中的腔模来实现全光开关

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-04 DOI: 10.3390/cryst14090787

Chang Liu, Dong Wei, Xiaochun Lin, Yaoxian Zheng

{"title":"All-Optical Switching Using Cavity Modes in Photonic Crystals Embedded with Hyperbolic Metamaterials","authors":"Chang Liu, Dong Wei, Xiaochun Lin, Yaoxian Zheng","doi":"10.3390/cryst14090787","DOIUrl":"https://doi.org/10.3390/cryst14090787","url":null,"abstract":"Hyperbolic metamaterials (HMMs) are highly anisotropic materials with the unique property of generating electromagnetic modes. Understanding how these materials can be applied to control the propagation of light waves remains a major focus in photonics. In this study, we inserted a finite-size HMM rod into the point defect of two-dimensional photonic crystals (PhCs) and investigated the unique cavity modes of this hybrid system. The HMM enhances the efficiency of the cavity system in controlling light transmission. Numerical results demonstrate that the cavity modes based on HMMs can be categorized into various types, showing high Q-factors and promising potential for resonant modulation. Furthermore, the switching performance of the cavity with an HMM rod was examined, revealing that the finite-size HMM modes are highly frequency-sensitive and suitable for nonlinear controlled all-optical switching. These switches, characterized by low power consumption and high extinction ratios, are highly suitable for integration into photonic systems. Our investigation on the new type of HMM cavity illustrates that anisotropic materials can be effectively applied in cavity systems to generate highly efficient modes for filtering and switching.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"20 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202515","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}

引用次数: 0

Mixed-Metal Coordination Polymers 混合金属配位聚合物

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-03 DOI: 10.3390/cryst14090785

Ulli Englert

引用次数: 0

Multi-Objective Optimization for the Forming Quality of a CeO2/Al6061 Alloy as an Aluminum–Air Battery Anode Manufactured via Selective Laser Melting 多目标优化 CeO2/Al6061 合金的成型质量，将其作为通过选择性激光熔化技术制造的铝-空气电池阳极

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-03 DOI: 10.3390/cryst14090784

Guangpan Peng, Chenhao Niu, Yuankun Geng, Weipeng Duan, Shu Cao

{"title":"Multi-Objective Optimization for the Forming Quality of a CeO2/Al6061 Alloy as an Aluminum–Air Battery Anode Manufactured via Selective Laser Melting","authors":"Guangpan Peng, Chenhao Niu, Yuankun Geng, Weipeng Duan, Shu Cao","doi":"10.3390/cryst14090784","DOIUrl":"https://doi.org/10.3390/cryst14090784","url":null,"abstract":"To improve the discharge performance of aluminum–air batteries, CeO2/Al6061 composites were prepared as an anode using selective laser melting (SLM). Response surface methodology (RSM) was employed, and the test results were linearly fitted. A prediction model for the forming quality of the composite anode was established, and the reliability of the model and the interaction between process parameters were explored based on variance analysis and significance testing. On this basis, with corrosion potential, self-corrosion rate, and discharge voltage as optimization objectives, the optimal solution set of the SLM forming CeO2/Al6061 anode process parameter was solved through a genetic algorithm, and experimental verification was conducted. The results indicate that the optimal process range for the forming quality and various properties of composite materials is laser power of 265~285 W, scanning speed of 985~1025 mm/s, and scanning spacing of 0.116~0.140 mm. The optimized process parameters were selected for reliability testing, and the errors were all within 3.0%, verifying the accuracy and reliability of the model.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"34 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202511","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}

引用次数: 0

Hydrometallurgical Technology for Producing Rhenium(VII) and Cobalt(II) from Waste 从废物中生产铼（VII）和钴（II）的湿法冶金技术

IF 2.7 4区材料科学

Crystals Pub Date : 2024-09-02 DOI: 10.3390/cryst14090783

Katarzyna Leszczyńska-Sejda, Joanna Malarz, Mateusz Ciszewski, Dorota Kopyto, Karolina Goc, Alicja Grzybek, Patrycja Kowalik, Szymon Orda, Karolina Pianowska, Aleksandra Turczyńska, Grzegorz Benke

{"title":"Hydrometallurgical Technology for Producing Rhenium(VII) and Cobalt(II) from Waste","authors":"Katarzyna Leszczyńska-Sejda, Joanna Malarz, Mateusz Ciszewski, Dorota Kopyto, Karolina Goc, Alicja Grzybek, Patrycja Kowalik, Szymon Orda, Karolina Pianowska, Aleksandra Turczyńska, Grzegorz Benke","doi":"10.3390/cryst14090783","DOIUrl":"https://doi.org/10.3390/cryst14090783","url":null,"abstract":"This paper presents a method for obtaining cobalt(II) perrhenate from waste derived from two types of materials, i.e., Li-ion battery scrap, or more precisely, battery mass, and superalloy scrap. Both of the above-mentioned materials are a source of Co. However, a source of rhenium is perrhenic acid produced from ammonium perrhenate (recycled) by the ion exchange method using resins. Co(OH)2 can be precipitated from solutions resulting from the leaching of Li-ion battery mass, sludge from the Zn-Pb industry and superalloy scrap. The compound, after proper purification, can be used in a reaction with perrhenic acid to form Co(ReO4)2. The reaction should be conducted under the following conditions: time 1 h, room temperature, 30% excess of cobalt(II) hydroxide, and rhenium concentration in HReO4 from about 20 g/dm3 to 300 g/dm3. This work shows that with the use of Co(OH)2, obtained from waste, an anhydrous form of cobalt(II) perrhenate can be obtained, containing < 1000 ppm of the cumulative metal impurities.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"12 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202518","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}

引用次数: 0