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depth profiling of arsenian pyrite in Carlin-type ores through wet chemistry

Acta Geochimica 2023年第2期42卷 256-265页

作者： Meizhi Yang Quan Wan Xin Nie Suxing Luo Yuhong Fu Ping Zeng Wenqi Luo State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Comparative Planetology Hefei 230026China Department of Chemistry and Chemical Engineering Zunyi Normal CollegeZunyi 563006China School of Geographic and Environmental Sciences Guizhou Normal UniversityGuiyang 550001China

Enrichment of As and Au at the overgrowth rims of arsenian pyrite is a distinctive feature of Carlin-type gold *** distribution of such key elements in high resolution is of fundamental importance yet often proves *** this study,repeated non-oxidative acid etching of ore samples from Shuiyindong gold deposit was applied to enable elemental depth profiling of goldbearing arsenian pyrite ***-OES and AAS were used to determine the dissolved Fe,As,and Au concentrations in each of the etching solutions,and XPS was carried out to exam the etched mineral *** contrast to conventional ion beam etching that may cause substantial sample damage,our acid etching method does not seem to significantly alter the composition and chemical state of the *** etched depths directly converted from the measured elemental concentrations can reproducibly reach a very high resolution of~1 nm,and can be conveniently controlled through varying the etching *** the Fe and As depth profiles consistently reflect the surface oxidation property of arsenian pyrite,the Au profile displaying an obvious upward trend reveals the ore fluid evolution at the late stage of *** on our experimental results,we demonstrate that our wet chemistry method is capable of effective depth profiling of gold ore and perhaps other geological samples,with advantages surpassing many instrumental techniques including negligible sample damage,nanoscale resolution as well as isotropic etching.

关键词： Wet chemistry Acid etching depth profiling Carlin-type gold deposits Arsenian pyrite

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depth profiling OF DEUTERIUM IN Al_2O_3

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Nuclear Science and Techniques 1995年第3期6卷 150-153页

作者：谈效华罗四维宋哲明赖祖武赵国庆周筑颖

D+2 ions of 70 and 90 keV were separately implanted into two thick samples of sintered alumina ceramic and the distribution of deuterium has been measured for three runs at an interval of 5 months using high energy proton backscattering and elastic recoil detection (ERD). The measured data show that there is little diffusion of deuterium in A12O3 and the diffusion coefficient is deduced to be 1.1 ×10-17 cm2/s. The measured total concentration of implanted deuterium is 4.5×1018 at./cm2. The profile of hydrogen adsorbed on the surface of Al2O3 samples was also observed by ERD and 1H(19F, αγ)16O analysis. The distribution range of 1H in Al2O3 after deuterium implantation is much larger than that before one.

关键词： depth profiling Diffusion coefficient Deuterium Ceramic

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Zircon age depth-profiling sheds light on the early Caledonian evolution of the Seve Nappe Complex in west-central J?mtland

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Geoscience Frontiers 2022年第2期13卷 460-470页

作者： Katarzyna Walczak Christopher J.Barnes Jaroslaw Majka David G.Gee Iwona Klonowska AGH University of Science and Technology Faculty of GeologyGeophysics and Environmental Protectional.Mickiewicza 3030-059 KrakówPoland Uppsala University Department of Earth SciencesVillavagen 16752-36 UppsalaSweden

The Scandinavian Caledonides comprise nappe stacks of far-travelled allochthons that record closure of the Iapetus Ocean and subsequent continental collision of Baltica and *** Seve Nappe Complex(SNC)of the Scandinavian Caledonides includes relics of the outermost Baltoscandian passive margin that were subducted to mantle *** earliest of the deep subduction events has been dated to ca.500-480 *** of this event has been reported from the northern exposures of the *** south in the central and southern segments of the SNC,(ultra)high-pressure rocks have yielded younger ages in the range of ca.470-440 *** study provides the first record of the early Caledonian event in the southern *** evidence has been obtained by depth profiling of zircon grains that were extracted from the Tv?r?klumparna microdiamond-bearing *** zircon grains preserve eclogite facies overgrowths that crystallized at 482.6±3.8 Ma.A second,chemically-distinct zircon overgrowth records granulite facies metamorphism at 439.3±3.6 Ma,which corroborates previous geochronological evidence for granulite facies metamorphism at this *** on these results,we propose that the entire outer margin of Baltica was subducted in the late Cambrian to early Ordovician,but the record of this event may be almost entirely eradicated in the vast majority of lithologies by pervasive late Ordovician to early Silurian metamorphism.

关键词： Caledonian Orogeny Seve Nappe Complex Zircon geochronology depth profiling HP/UHP metamorphism Double dunking

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Opto-thermal Moisture Content and Moisture depth Profile Measurements in Organic Materials

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Chemical Research in Chinese Universities 2004年第4期20卷 417-420页

作者： XIAOPeng GUOXin-xin CUIYing-xin RobertE.Imhof DaneBicanic SchoolofEngineering SouthBankUniversity103BoroughRoadLondonSE10AAUK DepartmentofMechanicalandIndustrialEngineering UniversityofToronto5King＇sCollegeRdTorontoOntarioMSS3G8Canada DepartmentofAgrotechnologyandFoodSciences WageningenUniversityandResearchCentreBomenweg46503HDWageningenTheNetherlands

Opto-thermal transient emission radiometry(OTTER) is a infrared remote sensing technique, which has been successfully used in in vivoskin moisture content and skin moisture depth profiling measurements. In present paper, we extend this moisture content measurement capability to analyze the moisture content of fruit(tomato, grape, etc.) skins, and to study the relationship between fruits ripening process and their surface moisture and moisture depth profiles.

关键词： Laser Opto-thermal radiometry Infrared Moisture content depth profiling Organic material

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XPS Study of Electroless Deposited Sb₂Se₃ Thin Films for Solar Cell Absorber Material

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Energy and Power Engineering 2023年第11期15卷 363-371页

作者： Towhid Adnan Chowdhury Department of Electrical & Electronic Engineering Ahsanullah University of Science & Technology Dhaka Bangladesh

As a thin film solar cell absorber material, antimony selenide (Sb2Se3) has become a potential candidate recently because of its unique optical and electrical properties and easy fabrication method. X-ray photoelectron spectroscopy (XPS) was used to determine the stoichiometry and composition of electroless Sb2Se3 thin films using depth profile studies. The surface layers were analyzed nearly stoichiometric. But the abundant amount of antimony makes the inner layer electrically more conductive.

关键词： Sb2Se3 Electroless depth profiling Thin Film X-Ray Photoelectron Spectroscopy

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XPS depth Profile Study of Sprayed Ga₂O₃ Thin Films

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Engineering（科研） 2023年第8期15卷 459-466页

作者： Towhid Adnan Chowdhury Department of Electrical & Electronic Engineering Ahsanullah University of Science & Technology Dhaka Bangladesh

Ga2O3 thin films were fabricated by spray pyrolysis method using gallium acetylacetonate as source material and water as oxidizer. The films were annealed at 450°C for 60 minutes in argon atmosphere. X-ray photoelectron spectroscopy (XPS) depth profile studies were carried out to analyze the stoichiometry and composition of sprayed as-deposited and annealed Ga2O3 thin films. Surface layers and the inner layers of as-deposited and annealed films were found nearly stoichiometric.

关键词： Ga2O3 Thin Films x-Ray Photoelectron Spectroscopy depth profiling

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depth Profile Study of Electroless Deposited Sb₂S₃ Thin Films Using XPS for Photovoltaic Applications

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Materials Sciences and Applications 2023年第7期14卷 397-406页

作者： Towhid Adnan Chowdhury Department of Electrical & Electronic Engineering Ahsanullah University of Science & Technology Dhaka Bangladesh

Sb2S3 has gained tremendous research recently for thin film solar cell absorber material because of their easy synthesis, unique electrical and optical properties. The stoichiometry and composition of electroless Sb2S3 thin films were analyzed using XPS depth profile studies. The surface layers were found nearly stoichiometric. On the other hand, the inner layer was rich in antimony composition making it more conductive electrically.

关键词： Sb2S3 depth profiling X-Ray Photoelectron Spectroscopy Thin Film Electroless

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Investigation of Sprayed Lu₂O₃ Thin Films Using XPS

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Advances in Materials Physics and Chemistry 2023年第11期13卷 197-205页

作者： Towhid Adnan Chowdhury Department of Electrical & Electronic Engineering Ahsanullah University of Science & Technology Dhaka Bangladesh

Spray pyrolysis method was used to deposit Lutetium Oxide (Lu2O3) thin films using lutetium (III) chloride as source material and water as oxidizer. Annealing was carried out in argon atmosphere at 450°C for 60 minutes of the films. To investigate the composition and stoichiometry of sprayed as-deposited and annealed Lu2O3 thin films, depth profile studies using X-ray photoelectron spectroscopy (XPS) was done. Nearly stoichiometric was observed for both annealed and as-deposited films in inner and surface layers.

关键词： Lu2O3 depth profiling X-Ray Photoelectron Spectroscopy Thin Films

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