Article
Crystallography
Hironaga Oyama, Takashi Miyamoto, Akiko Sekine, Ilma Nugrahani, Hidehiro Uekusa
Summary: This study reveals the solid-state dehydration/hydration mechanism of DIC-Na hydrates and the structural relationship among different hydrated forms through crystal structure analysis. The dehydration of the 4.75-hydrate form occurs in two steps, leading to substantial structural reconstruction during the subsequent dehydration into the anhydrous phase.
Article
Chemistry, Multidisciplinary
Pengpeng Yang, Junyang Jin, Qingshi Wen, Chenguang Lin, JinQiu Fu, Wei Zhuang, Jinglan Wu, Dong Liu, Chenjie Zhu, Hanjie Ying
Summary: Different hydrates of adenosine3',5'-cyclic phosphate sodium (cAMPNa center dot nH(2)O, n = 2, 4, 5) exhibit major differences in crystal morphologies, molecular conformation, bonding profiles, and crystal water distribution in the lattices. The distinct desorption dynamics of crystal water for the different hydrates are mainly attributed to their steric effects in the crystal lattice. Reversible conversions between the hydrates and their corresponding low hydrates or even anhydrates occur along with desorption/uptake of crystal water mediated by humidity. However, the reversible transformation capability would be disabled once the host structures were destroyed due to excessive loss of crystal water.
Article
Chemistry, Physical
L. L. Bao, H. Yibole, J. Y. Xu, Z. Q. Ou, O. Haschuluu, O. Tegus, N. H. van Dijk, E. Bruck, F. Guillou
Summary: (English Summary:)
This study explores the structural and magnetic phase diagrams of (Fe,Co)(2)(P,Si) compounds, with a focus on the observation range of the hexagonal Fe2P-type structure. It is found that under certain conditions of Si content and Fe substitution for Co, the samples undergo structural distortion and exhibit different crystal structures. Additionally, simultaneous Co substitution for Fe and Si substitution for P helps to observe the hexagonal structure. This study provides guidance for future investigations in determining the desired range of properties for permanent magnetic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Patric Berger, Clemens Schmetterer, Herta Effenberger, Hans Flandorfer
Summary: This study presents the first reported isothermal sections of the Sb-Sn-Ti system at different temperatures, identifying two new ternary phases and determining their crystal structures using X-ray diffraction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biochemistry & Molecular Biology
Grace Baaklini, Manon Schindler, Lina Yuan, Clement De Saint Jores, Morgane Sanselme, Nicolas Couvrat, Simon Clevers, Philippe Negrier, Denise Mondieig, Valerie Dupray, Yohann Cartigny, Gabin Gbabode, Gerard Coquerel
Summary: The presence of water in DMU powder significantly affects the transition temperature between its polymorphic forms. The decrease in temperature is primarily due to thermodynamics rather than kinetics, as shown by the phase diagram. This study also reveals the existence of a previously unreported monohydrate of DMU.
Article
Chemistry, Physical
N. E. Volkova, M. Bazueva, D. T. Aisarinova, A. D. Alkhamova, L. Ya Gavrilova, V. A. Cherepanov, A. Maignan
Summary: The study investigated 96 samples in the Ba1-xPrxFe1-yCoyO3-delta system, establishing the compositional boundaries of stability for three types of crystal structure. The cubic and orthorhombic perovskites' unit cell parameters were refined, and the oxygen content was found to increase with Pr and Fe contents. A pseudo-phase diagram outlining the stability ranges for all three types of complex oxides was generated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Mathias Jorgensen, Wei Zhou, Hui Wu, Terrence J. Udovic, Mark Paskevicius, Radovan Cerny, Torben R. Jensen
Summary: Metal closo-borates and their derivatives are promising in various applications due to their stability and researchers have reported the synthesis and structural analysis of alpha- and beta-CaB10H10. The distinctions between the two polymorphs lie in crystal system, topology, and coordination tetrahedron displacement. Additionally, the hydrates exhibit structural diversity with ordered and disordered structures, revealing complex networks of hydrogen interactions.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Ales Kroupa, Ondrej Zobac, Klaus W. Richter
Summary: The Al-Cu binary system, a key binary system for many important industrial alloys, required a new CALPHAD-type thermodynamic description due to new experimental results about phase equilibria. By implementing known crystallography and site occupations in crystallographic positions, as well as modeling intermetallic phases with temperature modifications, good agreement was reached with experimental results for the phase diagram and calculated thermodynamic properties.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
A. I. Pogodin, M. J. Filep, V. I. Studenyak, O. I. Symkanych, I. P. Stercho, V. Yu. Izai, O. P. Kokhan, P. Kus
Summary: We present a detailed study of Ag7+x(P1-xGex)S-6 single crystals of novel superionic conductors with argyrodite structure. The crystal structure and electrical conductivity of the solid solutions were investigated, revealing the presence of partial occupancy of Ag positions and a significant increase in ionic conductivity due to structural disordering caused by hetero-valent cationic substitution of P+5 <-> Ge+4.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Richard S. Hong, Alessandra Mattei, Ahmad Y. Sheikh, Mark E. Tuckerman
Summary: Researchers have developed a method called MACH for predicting the structures of organic molecular crystal hydrates. By mapping water positions within the crystal structure, this method can efficiently predict stoichiometric, fractional, and nonstoichiometric hydrate structures without the need for specifying water content in advance.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Energy & Fuels
Byeonggwan Lee, Kyuchul Shin, Saman Alavi, John A. Ripmeester
Summary: In this study, the effect of NH4F doping on N-2, O-2, and CH4 hydrates was investigated. The results showed that NH4F doping can modify the size and electrostatic charge distribution of molecules within the hydrate cages, and induce a transition in the preferred structure of N2 hydrate. These findings suggest that crystal engineering of hydrate lattices can be a potential approach to enhance hydrate-based gas separation technologies.
Article
Chemistry, Physical
Susanna Syniakina, Benjamin Grushko, Louisa Meshi
Summary: The stable R-phase (Cmcm structure, a = 7.730 & ANGS;, b = 24.035 & ANGS; and c = 12.597 & ANGS;) was discovered at 700 degrees C in a small compositional region centered around Al79.5Mn16Pt4.5. The phase equilibria in its vicinity at 700 degrees C were determined, and it was found to be in equilibrium with the ternary extension of the Al-Mn T-phase. An atomic model of the R-phase, consisting of 124 Al, 24 Mn, and 8 Pt atoms, was deduced through direct methods applied to the 3D electron-diffraction tomography data and compared with the Al-Mn-Ni R-phase and Al-Mn-Pt(Pd) T-phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
A. M. Gabay, Chaoya Han, Chaoying Ni, G. C. Hadjipanayis
Summary: Recently, the lack of knowledge about the high-temperature phase equilibria in the Sm-Fe-Ti system has been brought to attention due to new attempts in developing high-performance rare-earth-lean permanent magnets based on the Sm(Fe,Ti)12 compound. Experimental investigation has revealed inaccuracies in the currently accepted phase relations, leading to a revision of the Fe-rich corner of the Sm-Fe-Ti phase diagram. The study also found extended Ti ranges for the Sm(Fe,Ti)12 and Sm3(Fe,Ti)29 phases, and identified the equilibrium between the Sm2(Fe,Ti)17 and TiFe2 phases. The revised phase diagram is essential for the manufacturing of Sm (Fe,Ti)12-based permanent magnets via liquid-phase sintering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Xinlin Yan, Pavel Broz, Jan Vrestal, Jiri Vlach, Jiri Bursik, Martina Mazalova, Jana Pavlu, Bedrich Smetana, Gerda Rogl, Markus Eiberger, Andriy Grytsiv, Herwig Michor, Herbert Mueller, Gerald Giester, Peter Rogl
Summary: The constitution of the two phase diagrams Nb-Mn and Ta-Mn has been determined using various methods, revealing the characteristics of binary compounds, congruent melting, and eutectic reactions. The detailed distribution of atom sites in the Laves phases has been established.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
A. M. Gabay, Chaoya Han, Chaoying Ni, G. C. Hadjipanayis
Summary: Iron-rich corners of Sm-Fe-Ti phase diagram and quasi-ternary Sm-Fe0.8Co0.2-Ti phase diagrams are constructed based on experimental investigation. The existence of a high-temperature Th2Ni17-type phase is confirmed. The composition, equilibria, and magnetic anisotropy of cobalt-substituted phases are established.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Geosciences, Multidisciplinary
Jacob Heinz, Dirk Schulze-Makuch, Samuel P. Kounaves
GEOPHYSICAL RESEARCH LETTERS
(2016)
Article
Astronomy & Astrophysics
Jacob Heinz, Janosch Schirmack, Alessandro Airo, Samuel P. Kounaves, Dirk Schulze-Makuch
Article
Multidisciplinary Sciences
Dirk Schulze-Makuch, Dirk Wagner, Samuel P. Kounaves, Kai Mangelsdorf, Kevin G. Devine, Jean-Pierre de Vera, Philippe Schmitt-Kopplin, Hans-Peter Grossart, Victor Parro, Martin Kaupenjohann, Albert Galy, Beate Schneider, Alessandro Airo, Jan Froesler, Alfonso F. Davila, Felix L. Arens, Luis Caceres, Francisco Solis Cornejo, Daniel Carrizo, Lewis Dartnell, Jocelyne DiRuggiero, Markus Flury, Lars Ganzert, Mark O. Gessner, Peter Grathwohl, Lisa Guan, Jacob Heinz, Matthias Hess, Frank Keppler, Deborah Maus, Christopher P. McKay, Rainer U. Meckenstock, Wren Montgomery, Elizabeth A. Oberlin, Alexander J. Probst, Johan S. Saenz, Tobias Sattler, Janosch Schirmack, Mark A. Sephton, Michael Schloter, Jenny Uhl, Bernardita Valenzuela, Gisle Vestergaard, Lars Woermer, Pedro Zamorano
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2018)
Article
Astronomy & Astrophysics
Jacob Heinz, Annemiek C. Waajen, Alessandro Airo, Armando Alibrandi, Janosch Schirmack, Dirk Schulze-Makuch
Article
Astronomy & Astrophysics
Jacob Heinz, Dirk Schulze-Makuch
Article
Multidisciplinary Sciences
Deborah Maus, Jacob Heinz, Janosch Schirmack, Alessandro Airo, Samuel P. Kounaves, Dirk Wagner, Dirk Schulze-Makuch
SCIENTIFIC REPORTS
(2020)
Article
Microbiology
Annemiek C. Waajen, Jacob Heinz, Alessandro Airo, Dirk Schulze-Makuch
FRONTIERS IN MICROBIOLOGY
(2020)
Article
Microbiology
Dirk Schulze-Makuch, Daniel Lipus, Felix L. Arens, Mickael Baque, Till L. Bornemann, Jean-Pierre de Vera, Markus Flury, Jan Froesler, Jacob Heinz, Yunha Hwang, Samuel P. Kounaves, Kai Mangelsdorf, Rainer U. Meckenstock, Mark Pannekens, Alexander J. Probst, Johan S. Saenz, Janosch Schirmack, Michael Schloter, Philippe Schmitt-Kopplin, Beate Schneider, Jenny Uhl, Gisle Vestergaard, Bernardita Valenzuela, Pedro Zamorano, Dirk Wagner
Summary: In the Atacama Desert, hypolith colonized rocks serve as microbial hotspots, while gypsum crusts and salt rock environments show limited microbial activity. Phototrophs play a key role in the desert ecology, as the major environmental constraints in the Atacama Desert are water availability and UV irradiation.
Article
Biology
Jacob Heinz, Vita Rambags, Dirk Schulze-Makuch
Summary: The study explores the tolerance of the halotolerant yeast Debaryomyces hansenii to various solutes, with the lowest water activities enabling growth in glycerol and fructose-rich media being approximately 0.83. The solute tolerances of D. hansenii are found to correlate with eutectic freezing point depressions and deliquescence relative humidities of the respective solutes, impacting our understanding of habitability in solute-rich low water activity environments on Earth and beyond.
Article
Microbiology
Jacob Heinz, Joerg Doellinger, Deborah Maus, Andy Schneider, Peter Lasch, Hans-Peter Grossart, Dirk Schulze-Makuch
Summary: Little is known about the toxicity of perchlorates for microorganisms on the cellular level. This study conducted the first proteomic investigation on the perchlorate-specific stress responses of the halotolerant yeast Debaryomyces hansenii and compared them to known salt stress adaptations. The study found that the responses to NaCl and NaClO4-induced stresses share many common metabolic features, but also identified several new perchlorate-specific stress responses. These findings are relevant for potential life on Mars.
ENVIRONMENTAL MICROBIOLOGY
(2022)
