Article
Chemistry, Physical
Claire A. McLellan, Chris Siefe, Jason R. Casar, Chunte Sam Peng, Stefan Fischer, Alice Lay, Abhinav Parakh, Feng Ke, X. Wendy Gu, Wendy Mao, Steven Chu, Miriam B. Goodman, Jennifer A. Dionne
Summary: This Letter reports the development of mechano-sensing upconverting nanoparticles (UCNPs) based on lanthanide dopants, which exhibit ratiometric change in emission spectra and bright emission under applied pressure. The authors synthesized and analyzed five different types of nanoparticles and determined their noise equivalent sensitivity using optical spectroscopy and single-particle brightness.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Geology
Chris Yakymchuk, Vincent van Hinsberg, Christopher L. Kirkland, Kristoffer Szilas, Carson Kinney, Jillian Kendrick, Julie A. Hollis
Summary: The investigation in southern West Greenland found that corundum in the late Neoarchean rocks of the Maniitsoq region was formed by amphibolite-facies metamorphism of aluminosilicate schist. The presence of graphite indicates corundum growth in the presence of a mixed hydrous-carbonic fluid, facilitating its growth.
ORE GEOLOGY REVIEWS
(2021)
Article
Physics, Multidisciplinary
V. V. Prut
Summary: This paper introduces a new method of calibration of the ruby pressure scale based on the Hugoniot equation of state and isotherm static method, and compares it with other methods.
RUSSIAN PHYSICS JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Hansen Hua, Jumpei Ueda, Jian Xu, Michele Back, Setsuhisa Tanabe
Summary: The photoluminescence properties of Cr3+-doped LaGaO3 perovskites were studied under high pressure, revealing a redshift of the R-line due to a decrease in Racah parameters B and C. With increasing pressure, the N-line luminescence becomes stronger relative to the R-line and can be used to monitor phase transition pressure. The decreased tilt angle of the GaO6 octahedral unit under high pressure enhances the superexchange interaction between Cr3+ ions.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
E. Solana-Madruga, A. M. Arevalo-Lopez
Summary: This article revisits the polymorphism, structural features, and magnetic properties of A-site manganites and pays tribute to three scientists.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Vincent van Hinsberg, Chris Yakymchuk, Angunguak Thomas Kleist Jepsen, Christopher L. Kirkland, Kristoffer Szilas
Summary: This study uses thermodynamic modelling to constrain the conditions of corundum formation in southern Greenland, indicating that corundum saturation is the result of residual enrichment rather than Al mobilisation. A complex interplay among lithologies involved in corundum formation is highlighted, demonstrating that corundum formation is a predictable part of geological history.
Article
Engineering, Electrical & Electronic
Aleksandar Ciric, Stevan Stojadinovic, Zoran Ristic, Zeljka Antic, Miroslav D. Dramicanin
Summary: The thermographic properties of Cr3+-doped Al2O3 coatings created by plasma electrolytic oxidation were investigated. The coatings were found to be dense and uniformly distributed over the aluminum surface, with room-temperature photoluminescent measurements revealing specific emissions typical for Cr3+ in Al2O3 octahedral configuration. Temperature information was obtained from the coating's emission, with maximal sensitivities observed for different temperature-induced changes in the emissions.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Coatings & Films
Zhe R. Liu, Xu Sun, Jian W. Du, Li Chen
Summary: This study proposes an approach to promote the synthesis of corundum structured alpha-(Cr, Al)2O3 coatings at low temperatures by increasing the oxygen pressure during the deposition process. The results show that the crystallization of alpha-(Cr, Al)2O3 and the hardness of the coatings can be controlled by adjusting the oxygen pressure, leading to improved thermal stability and mechanical properties.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Wan Xu, Victor Naden Robinson, Xiao Zhang, Hui-Chao Zhang, Mary-Ellen Donnelly, Philip Dalladay-Simpson, Andreas Hermann, Xiao-Di Liu, Eugene Gregoryanz
Summary: Mixtures of ammonia and water are key components in the hot ice mantle regions of icy planets, with AHH playing a pivotal role in precipitating from water-rich mixtures under pressure. Spectroscopic measurements show the spontaneous ionization of AHH under compression, transforming from molecular to ionic states.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Ceramics
Yuchi Liu, Hongfeng Yin, Yun Tang, Yalou Xin, Hudie Yuan, Xiaohu Ren, Qifa Wan
Summary: In this study, lightweight mullite-corundum refractory was prepared using quartz, bauxite, and corundum as the main raw materials through the Kirkendall effect. During high-temperature firing, the silicon-rich phase reacts with corundum powder to form mullite, while quartz continuously dissolves into the silicon-rich liquid phase and leaves holes in the original position.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Y. Tariwong, N. Chanthima, N. Kiwsakunkran, H. J. Kim, R. Rajaramakrishna, S. Kothan, J. Kaewkhao
Summary: The paper investigates the luminescence spectra of corundum and feldspar gemstones under X-ray excitation, and confirms their identification through compositional, structural and optical analysis. The study demonstrates that the XIL technique is a reliable and non-destructive tool for characterizing corundum and feldspar minerals.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Piotr A. Gunka, Michael Hanfland, Yu-Sheng Chen, Janusz Zachara
Summary: High-pressure structural studies of arsenic(III) oxide polymorphs reveal that claudetite I is the densest and least compressible ambient-pressure As2O3 polymorph, with no phase transitions under high pressure or low temperature. The coordination sphere of arsenic atoms is thoroughly characterized, showing that claudetite I does not exhibit the highest coordination numbers despite being the densest polymorph. The pressure dependence of As-O bond lengths and stereoactivity of arsenic lone electron pairs are also investigated, demonstrating consistent behaviors across different As2O3 polymorphs.
Article
Materials Science, Multidisciplinary
Carlos Hernandez, Santosh K. Gupta, Jose P. Zuniga, Jorge Vidal, Rene Galvan, Hector Guzman, Lilian Chavez, Karen Lozano, Yuanbing Mao
Summary: In this study, flexible PVDF fibrous mats doped with Eu3+ sources were developed using Forcespinning method. The high-pressure optical properties of Eu3+ ions in EN-PF and ES-PF were investigated, showing different extent of changes in their characteristics with increasing pressure. Irreversible changes were observed in both Eu3+ doped PVDF systems under high-pressure conditions, presenting opportunities for multifunctional applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Santosh K. Gupta, Yuanbing Mao
Summary: The design of color-tunable phosphors as pressure sensors has attracted significant attention. This work demonstrates the potential of luminescent Y2Hf2O7:Eu3+ nanoparticles as medium-range pressure sensors with tunable luminescence from red to orange to yellow, depending on the applied pressure.
Article
Chemistry, Physical
Abu Asaduzzaman
Summary: A density functional theory study was conducted to investigate the etching and corrosion of aluminum with fluorine-based plasma. The results showed that the interaction between fluorine and aluminum surface is stronger compared to alumina surface, which explains the relative difficulty of etching alumina. Additionally, isopropyl alcohol used to clean the plasma chamber enhances the interaction between surface aluminum atoms and fluorine.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
