Article
Multidisciplinary Sciences
Xiaodong Yao, Yinxin Bai, Cheng Jin, Xinyu Zhang, Qunfei Zheng, Zedong Xu, Lang Chen, Shanmin Wang, Ying Liu, Junling Wang, Jinlong Zhu
Summary: The authors of this study found that CuInP2S6 exhibits an anomalous enhancement of spontaneous polarization under hydrostatic pressure. This is in contrast to the typical pressure-induced suppression of ferroelectricity. The increase in polarization is attributed to the spatial instability of Cu cations and the increase of Cu occupancy at the interlayer site. These findings provide valuable insights into the behavior of this van der Waals material and suggest new avenues for improving its properties.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Neha Bura, Deepa Yadav, Ankit Bhoriya, Jasveer Singh, Nita Dilawar Sharma
Summary: This study reports on the structural evolutions of nano-crystalline europium sesquioxide under different pressures and temperatures. The material showed a structural phase transition from cubic to hexagonal phase at pressures up to 22 GPa, with new bands developing at higher temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Polymer Science
Cun Li, Li Han, Hongyuan Bai, Xuefei Wang, Yu Yin, Hong Yan, Xiaolu Zhang, Zheng Yang, Pibo Liu, Hongwei Ma
Summary: This study presents a significant example of modulating molecular weight distributions (MWDs) in living anionic polymerization (LAP) based on the locked-unlocked feature. Two strategies, intermittent and continuous, were proposed to flexibly adjust MWDs and control the symmetry of monomodal curves. Additionally, a series of Si-H functionalized block copolymers were successfully synthesized by taking advantage of the unlocked feature.
Article
Materials Science, Ceramics
Ming -An Shi, Wang-Suo Xia, Jia-Ning Wang, Ying Wang, Hai-Tao Wu, Xiao-Tong Xu
Summary: A series of novel Bi2O3-CeO2 ceramics were successfully fabricated, and the effects of phase transition and content variation of Bi2O3 on the sintering temperature, microstructure, and microwave dielectric properties were investigated. The results showed that phase transition and content variation of Bi2O3 significantly affected the sintering temperature, microstructure, and microwave dielectric properties.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Daigo Ohki, Kazuyoshi Yoshimi, Akito Kobayashi
Summary: We study a candidate topological insulator in a low symmetry lattice and find an interaction-induced quantum spin Hall (QSH) insulator. We show that the spin-orbit gap can be greatly increased by considering repulsive interactions, leading to the appearance of a QSH insulating phase with finite spin Chern number and order parameter. Our calculations are consistent with experimental findings.
Article
Physics, Applied
Shingo Genchi, Mahito Yamamoto, Takuya Iwasaki, Shu Nakaharai, Kenji Watanabe, Takashi Taniguchi, Yutaka Wakayama, Hidekazu Tanaka
Summary: In this study, the relationship between the metallic domain size and the device-size-dependent MIT property of VO2 thin films grown on hBN was investigated. The results showed that VO2/hBN microwires exhibit multi-level step-like resistivity changes in the micrometer scale due to the confined metallic domains.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Mehdi Biderang, Mohammad-Hossein Zare, Jesko Sirker
Summary: Superconductivity in boron-doped (root 3 x root 3)Sn/Si(111) was studied using the random-phase approximation. The results showed that under certain conditions, chiral d-wave pairing was observed near half-filling and weak extended Hubbard interactions, while chiral p-wave and f-wave pairings were present at different filling levels and stronger nearest-neighbor Coulomb interactions. These findings suggest that charge fluctuations play a significant role in the formation of Cooper pairs, and the temperature dependence of the Knight shift can be used to examine the symmetry of the superconducting gap function.
Article
Optics
David R. Smith, Jeffrey J. Field, David G. Winters, Scott R. Domingue, Frauke Rininsland, Daniel J. Kane, Jesse W. Wilson, Randy A. Bartels
Summary: The study presents a method called radio frequency (RF) Doppler Raman spectroscopy for optical amplification of coherent Raman spectroscopy signal. By converting the Doppler frequency shift of a laser probe pulse into periodic timing jitter, amplification of Raman signal outside of focused interaction is enabled. Measurement of timing jitter allows access to lower noise floors than other coherent Raman techniques, opening up the potential to detect very weak Raman signals.
Article
Materials Science, Multidisciplinary
Huiping Hu, Kaiyang Xia, Yuechu Wang, Chenguang Fu, Tiejun Zhu, Xinbing Zhao
Summary: In this study, n-type pure phase Ag2Te compound was successfully synthesized and the co-precipitation of PbTe was found to improve the electrical stability of Ag2Te samples. A maximum zT of 0.72 was achieved at 570K for Pb-doped Ag2-xPbxTe (x = 0.03).
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Y. Kessentini, A. Ben Ahmed, S. S. Al-Juaid, Z. Elaoud
Summary: The study investigated the thermal properties of the organic-inorganic hybrid material (C12H10N)(2)SeO4H2O using various techniques including X-ray diffraction and Raman spectroscopy. The results indicated that the material did not undergo a structural phase transition at different temperatures, and the transport mechanism was likely dominated by the orientation of selenate anions. The significant variation in nonlinear optical parameters and the presence of a phase transition at 300 K were confirmed by Raman spectroscopy.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Spectroscopy
A. N. C. Ferreira, W. C. Ferreira, A. V. Duarte, C. C. Santos, P. T. C. Freire, C. Luz-Lima, J. V. B. Moura
Summary: In this study, the temperature-dependent behavior of monoclinic silver dimolybdate (m-Ag2Mo2O7) microrods was investigated using in situ Raman scattering. The m-Ag2Mo2O7 microrods were synthesized by conventional hydrothermal method at 423 K for 24 h. The structural phase transition from monoclinic to triclinic structure was observed at 698 K-723 K, accompanied by the melting process at 773 K. No morphological changes were observed during the structural phase transition at 723 K, while the growth of nanowires was observed on the Ag2Mo2O7 microrods in the triclinic structure at 773 K.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Materials Science, Ceramics
Yue Jiang, Sajjad S. Mofarah, Pramod Koshy, Wen-Fan Chen, Xueqing Fang, Xiaoran Zheng, Danyang Wang, Charles C. Sorrell
Summary: This study compiles contradictory literature on the binary subsystems of NBT material and experimentally determines the compatibilities in the ternary system, providing thermodynamic data for this system.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
K. Roleder, G. Catalan, A. M. Glazer, J. S. Baker, J. -H. Ko, F. H. Naqvi, S. B. Junaid, A. Majchrowski, Z. Trybula, J. Zareba, I. Lazar, D. Kajewski, J. Koperski, A. Soszynski
Summary: We have discovered a low-temperature polar phase in PbZrO3 below 270 K. The temperature dependence of polarization was determined by measuring pyroelectric current changes after poling the single crystal or ceramic in a DC electric field. This phenomenon was observed in both single crystals and ceramics, which may be related to the presence of polar (ferrielectric) antiphase boundaries within the antiferroelectric phase. The transition point was confirmed by changes in domain structure and anomalies in dielectric permittivity and losses in naturally grown single crystals and ceramic samples.
Article
Materials Science, Ceramics
Yangming Hu, Xiansheng Liu, Wei Wei, Huanli Yuan, Gaojie Zeng, Qilong Gao, Juan Guo, Mingju Chao, Erjun Liang
Summary: The solid solutions of Zr1+xMn1-xMo3-2xV2xO12 have been developed by introducing V5+ into ZrMnMo3O12, which shows reduced phase transition temperature and negative thermal expansion (NTE) property. The NTE property is induced by low-frequency phonons and makes it a material with great potential for applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Zeyang Luo, Huan Wang, Yuxin Ma, Guodong Zhang, Duanting Yang, Xinyu Rai, Dejun Wang, Runru Liu
Summary: In this study, a promising electrolyte material Bi0.76Lu0.16Ti0.08O1.5+delta with high oxygen ion conductivity was obtained by co-doping with Lu2O3 and TiO2 into Bi2O3. The results of XRD, SEM, and EIS experiments showed that the co-doped material exhibited a cubic fluorite structure, dense microstructure, and improved conductivity, with the highest value reaching 0.56 S cm(-1) at 700 degrees C. The findings confirmed the enhanced electrochemical performance of Bi2O3 by the co-dopants Lu(3+) and Ti4+.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Multidisciplinary
Elena Merzlyakova, Silke Wolf, Sergei Lebedkin, Lkhamsuren Bayarjargal, B. Lilli Neumeier, Daniel Bartenbach, Christof Holzer, Wim Klopper, Bjoern Winkler, Manfred Kappes, Claus Feldmann
Summary: A series of transition metal crown-ether coordination compounds were synthesized using ionic liquids, showing both conventional and unusual structural motifs. Some of these compounds exhibit outstanding photoluminescence properties, with high quantum yields observed for compounds like ZnI2, Mn2I4 (18-crown-6)(2), EuBr2, and EuI2. The optical properties and structural features of these compounds were characterized through various analytical techniques, revealing unique and efficient luminescent behavior.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
Dominik Spahr, Jannes Binck, Lkhamsuren Bayarjargal, Rita Luchitskaia, Wolfgang Morgenroth, Davide Comboni, Victor Milman, Bjoern Winkler
Summary: By reacting SrCO3 single crystal with SrO powder at moderately high pressures and high temperatures, the orthocarbonate Sr2CO4 with tetrahedrally coordinated carbon can be synthesized and recovered at ambient conditions. Experimental and theoretical analyses show that the C-O bond distances are similar lengths and the O-C-O angles deviate from the ideal tetrahedral angle by only a few degrees.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Dominik Spahr, Jannes Koenig, Lkhamsuren Bayarjargal, Victor Milman, Alexander Perlov, Hanns-Peter Liermann, Bjoern Winkler
Summary: Researchers have synthesized a novel inorganic pyrocarbonate salt, Sr[C2O5], which contains isolated [C2O5](2-) groups. This discovery significantly expands the crystal chemistry of inorganic carbonates. Through experimental and theoretical calculations, it is shown that Sr[C2O5] is a pyrocarbonate salt and it is predicted that more inorganic pyrocarbonates can be obtained. These findings are relevant to geoscience and provide insights into the conversion of CO2 into useful inorganic compounds.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Crystallography
Mathias Gogolin, M. Mangir Murshed, Lkhamsuren Bayarjargal, Detlef Klimm, Thorsten M. Gesing
Summary: The structural and phase transition properties of Pb2Sc2Si2O9 and Pb2In2Si2O9 compounds were investigated, confirming their crystal structures and phase transitions at different temperatures. Through studying parameters such as second harmonic generation, heat capacity, and Raman spectroscopy, a comprehensive understanding of the characteristics of these two compounds was achieved.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS
(2021)
Article
Geochemistry & Geophysics
Jannes Binck, Dominique Laniel, Lkhamsuren Bayarjargal, Saiana Khandarkhaeva, Timofey Fedotenko, Andrey Aslandukov, Konstantin Glazyrin, Victor Milman, Stella Chariton, Vitali B. Prakapenka, Natalia Dubrovinskaia, Leonid Dubrovinsky, Bjoern Winkler
Summary: By conducting single-crystal diffraction studies in laser-heated diamond-anvil cells, researchers have discovered that Ca2CO4 orthocarbonate, containing CO44- tetrahedra, can be formed at lower pressures than other carbonates. This suggests the possible presence of Ca2CO4 in the Earth's transition zone and lower mantle. Raman spectroscopy and DFT-theory based calculations support these findings.
AMERICAN MINERALOGIST
(2022)
Article
Chemistry, Physical
Eiken Haussuehl, Lkhamsuren Bayarjargal, Alexandra Friedrich, Rita Luchitskaia, Julia Buescher
Summary: This study presents the synthesis, crystal structure, thermal expansion, Raman spectra, and heat capacity of a new member in the family of metal-organic perovskites, Ca-guanidinium formate. The crystal structure of Ca-guanidinium formate exhibits an extraordinary strong negative thermal expansion, with a reduction of framework distortion on increasing temperature. The squeezing of formate groups by guanidinium groups and the associated reduction of framework distortion contribute to the strong negative thermal expansion.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Dominik Spahr, Tamara E. Koch, David Merges, Lkhamsuren Bayarjargal, Philomena-Theresa Genzel, Oliver Christ, Fabian Wilde, Frank E. Brenker, Bjoern Winkler
Summary: The experiment conducted under long-term microgravity conditions on the International Space Station provided insights into the energetics and experimental constraints required for the formation of chondrules in the solar nebula through 'nebular lightning'. The characterization of the samples revealed the formation of aggregates consisting of fused Mg2SiO4 particles under microgravity conditions. The experimental outcomes varied in appearance from small spherical melt-droplets to larger and irregularly shaped aggregates, providing new constraints and a roadmap for future experiments in both terrestrial and microgravity environments.
PHYSICS AND CHEMISTRY OF MINERALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Dominik Spahr, Jannes Koenig, Lkhamsuren Bayarjargal, Rita Luchitskaia, Victor Milman, Alexander Perlov, Hanns-Peter Liermann, Bjoern Winkler
Summary: Pb[C2O5], an inorganic pyrocarbonate salt, was synthesized through laser heating and characterized by various methods. The synthesis of Pb[C2O5] demonstrates the possibility of cation substitution in inorganic pyrocarbonates, making it a novel family of carbonates.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tobias A. Teichtmeister, Christian Paulsen, Sebastian J. Ambach, Klaus Wurst, Lkhamsuren Bayarjargal, Wolfgang Schnick, Hubert Huppertz
Summary: Here, we report the high-pressure/high-temperature synthesis of Tb3B10O17(OH)5 using a modified Walkertype multianvil device. The crystal structure of this rare-earth borate was determined by single-crystal X-ray diffraction methods and found to belong to the orthorhombic space group Pmn21 (no. 31), with unit cell parameters of a = 16.2527(4), b = 4.4373(1), and c = 8.8174(2) Å. The compound was characterized using infrared spectroscopy, energy-dispersive X-ray spectroscopy, second harmonic generation (SHG) measurements, and temperature-dependent X-ray powder diffraction. Tb3B10O17(OH)5 decomposes to /g-Tb(BO2)3 above 460 degrees C, and the formation of & mu;-TbBO3 was observed with increasing temperatures, which transforms to z-TbBO3 upon cooling.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Lea Pennacchioni, Sergio Speziale, Lkhamsuren Bayarjargal, Matthias Schneider, Bjoern Winkler
Summary: Sound velocities and elastic properties of synthetic amorphous calcium carbonate (ACC) samples with different water contents were measured at high pressures up to 20 GPa. The results show a smooth pressure-dependence of both longitudinal and transverse velocities. No anomaly was observed at the reported structural phase transition at 10 GPa, instead, the isentropic bulk modulus and its pressure derivative suggest a continuous structural evolution of ACC upon compression. The presence of water leads to a significant decrease in the bulk and shear moduli. If a certain percentage of CaCO3 is present in subducted oceanic crust, the phase transition from aragonite to anhydrous ACC would cause a detectable discontinuity in acoustic velocities.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2023)
Article
Chemistry, Inorganic & Nuclear
Raimund Ziegler, Felix R. S. Purtscher, Lkhamsuren Bayarjargal, Thomas S. Hofer, Hubert Huppertz
Summary: A novel zinc borate Zn2B10O17 with a unique crystal structure was successfully synthesized under high-pressure/high-temperature conditions. It features anionic borate framework formed by (BO4) units and zinc atoms located in channels, and has a wide band gap of 8.4 eV, categorizing it as an insulator.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Chemistry, Inorganic & Nuclear
Lkhamsuren Bayarjargal, Dominik Spahr, Victor Milman, Julien Marquardt, Nico Giordano, Bjorn Winkler
Summary: The inorganic anhydrous aluminum carbonates Al(2)[C2O5][CO3](2) and Al(2)[CO3](3) were synthesized by reacting Al2O3 with CO2 at high pressures and temperatures. Raman spectroscopy and X-ray diffraction were used to characterize their structures. Al-2[CO3](3) forms at around 24-28 GPa, while Al-2[C2O5][CO3](2) forms above 38(3) GPa. The new Al-2[C2O5][CO3](2) structure contains pyrocarbonate [C2O5](2-)-groups, trigonal [CO3](2-)-groups, and octahedrally coordinated trivalent cations, while Al-2[CO3](3) has isolated [CO3](2-)-groups. Both Al-carbonates can be recovered under ambient conditions.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Maxime A. Bonnin, Lkhamsuren Bayarjargal, Victor Milman, Bjoern Winkler, Claus Feldmann
Summary: [SeCl3][GaCl4] (1) and [TeCl3][GaCl4] (2) are synthesized via a Lewis-acid-base reaction between SeCl4 or TeCl4 and GaCl3 at 50°C (1) and 140°C (2), yielding quantitative yields. These ionic compounds consist of pseudo-tetrahedral [SeCl3](+)/[TeCl3](+) cations with stereochemically active electron lone pairs at Se(iv)/Te(iv) and tetrahedral [GaCl4](-) anions. Both compounds crystallize in the polar chiral space group P1 with unidirectional alignment of all tetrahedral building units. They are the first examples of a larger group of nonlinear optical compounds [MX3](+)[M'X-4](-) (M, M': metal or main-group element, X: halogen). Material characterization involves X-ray structure analysis, thermogravimetry, optical spectroscopy, infrared, and Raman spectroscopy. Second harmonic generation (SHG) is observed with intensities about 3-times stronger than potassium dihydrogen phosphate (KDP) in the visible spectral regime with narrow-band-gap materials (2.8, 3.2 eV). Density functional theory calculations are used to interpret the Raman spectra, visualize the stereochemically active lone electron pair, and compute the SHG tensor.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Christian Albers, Robin Sakrowski, Lelia Libon, Georg Spiekermann, Bjoern Winkler, Christian Schmidt, Lkhamsuren Bayarjargal, Valerio Cerantola, Stella Chariton, Nico Giordano, Hlynur Gretarsson, Johannes Kaa, Hanns-Peter Liermann, Martin Sundermann, Nicola Thiering, Metin Tolan, Max Wilke, Christian Sternemann
Summary: Iron-bearing carbonates with tetrahedrally coordinated carbon atoms have been found to play a crucial role in Earth's carbon cycle and carbon storage in the deep Earth. Experimental results show that these iron carbonates maintain a high-spin state even at extreme pressure and temperature conditions. Density functional theory calculations also confirm the experimental findings.
Article
Materials Science, Multidisciplinary
M. Stekiel, A. Girard, D. Zimmer, V Monteseguro, K. Glazyrin, I de Pedro, L. Bayarjargal, B. Winkler, J. Ruiz-Fuertes
Summary: The charge ordering phase transition of CaMn7O12 was investigated using high-pressure resistivity and single crystal X-ray diffraction. It was found that the Jahn-Teller distortion of the Mn3+O6 octahedra disappears at high pressure and there is a significant drop in resistivity. The slope of the charge ordering phase boundary is approximately -6 K/GPa and no structural phase transition was observed at 70 K.
