Article
Physics, Multidisciplinary
E. Lerner, E. Bouchbinder
Summary: By studying disordered crystals and structural glasses, we found that the quartic law is applicable in both materials, and disordered crystals have more quasilocalized excitations compared to structural glasses. This research contributes to understanding the essential factors for the emergence of universal nonphononic excitations in disordered solids.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Jiyu Hu, Zhenxiang Dai, Xucai Kan, Ganhong Zheng, Zheng Chen, Yongqing Ma
Summary: The study investigates the thermal and transport properties of topological single crystal TaNiTe5 at temperatures near 0 K and magnetic fields up to 14 T. By analyzing the variation of resistivity and Seebeck coefficients with temperature, electron-electron scattering and electron-phonon scattering effects are observed in different temperature regions. The findings suggest that electrons and phonons act as two effective charge carriers, contributing significantly to thermal conduction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Chanhee Kim, Dilip Bhoi, Yeahan Sur, Byung-Gu Jeon, Dirk Wulferding, Byeong Hun Min, Jeehoon Kim, Kee Hoon Kim
Summary: The study indicates that 2H-Pd0.08TaSe2 is a nodeless, multiband superconductor, with distinct characteristics under different temperatures and magnetic fields.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
P. P. Shen, F. S. Yuan, H. B. Zhou, J. Hu, B. A. Sun
Summary: This study systematically investigates the thermal conductivity behavior of amorphous alloys in as-cast glassy, relaxed, partially-crystallized, and well-crystallized states. It is found that the total thermal conductivity of the as-cast metallic glass is slightly lower than that of the relaxed sample, while the partially-crystallized and well-crystallized alloys exhibit significantly improved thermal conductivity. These results provide a foundation for understanding the mechanism of thermal conductivity evolution with the microstructure of metallic alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Anh-Tuan Pham, Thi Hoa Vu, Quang Nguyen, Minh Thanh Vu, Jong Ho Park, Su-Dong Park, Sunglae Cho
Summary: Pure and large Br-doped SnSe2 single crystals were successfully synthesized, leading to an improvement in power factor, especially along the in-plane direction. Anisotropy was observed in thermal conductivity and ZT values.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Physics, Applied
Raveena Gupta, Chandan Bera
Summary: This theoretical study investigates the high-performance thermoelectric properties of pristine Sn-based colusites, focusing on how structural disordering and vacancy defects contribute to reducing lattice thermal conductivity and enhancing the figure of merit (ZT). It is observed that low-energy soft optical phonons and vacancies play crucial roles in reducing thermal conductivity. The study shows that mass variance perturbation and vacancy numbers are important factors in tuning the thermal and electrical properties of the materials.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Masahiro Nomura, Roman Anufriev, Zhongwei Zhang, Jeremie Maire, Yangyu Guo, Ryoto Yanagisawa, Sebastian Volz
Summary: Thermal transport at the nanoscale level has attracted attention due to its physically interesting features such as the behavior of phonons and its potential applications in heat dissipation problems. Researchers have studied the thermal transport properties of various nanostructured materials, including phononic crystals. Phononic crystals provide a well-defined platform for investigating thermal transport. Controlling thermal transport through interference is also an interesting aspect.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Georgi B. Hadjichristov, Yordan G. Marinov
Summary: This study investigates the photoresponse of a star-shaped molecular structure called liquid-crystallinetris(keto-hydrozone)discotic (TKHD). The study also focuses on TKHD filled with single-walled carbon nanotubes (SWCNTs) at a concentration of 1 wt%. Both TKHD and SWCNT/TKHD nanocomposite films, at room temperature, were in a glassy state and exhibited photoluminescence ranging from deep-red to near-infrared, making them suitable for organic optoelectronics. The addition of SWCNTs stabilized the photoluminescence of TKHD, which is significant for optoelectronic device applications. The reversible photothermoelectrical effect in SWCNT/TKHD films was mediated by SWCNTs and their network, as characterized by electrical impedance spectroscopy.
Article
Chemistry, Multidisciplinary
Ankit Negi, Hwang Pill Kim, Zilong Hua, Anastasia Timofeeva, Xuanyi Zhang, Yong Zhu, Kara Peters, Divine Kumah, Xiaoning Jiang, Jun Liu
Summary: This paper demonstrates the room-temperature thermal modulation in 2.5 mm-thick Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) (PMN-xPT) single crystals. Through the use of advanced poling conditions and a systematic study on composition and orientation dependence, a range of thermal conductivity switching ratios, with a maximum of approximately 1.27, is observed. The simultaneous measurements of piezoelectric coefficient (d(33)), domain wall density using polarized light microscopy (PLM), and birefringence change using quantitative PLM reveal an increase in domain wall density at intermediate poling states (0< d(33)< d(33(max)) compared to the unpoled state.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Nattapol Ma, Ryo Ohtani, Hung M. Le, Soren S. Sorensen, Ryuta Ishikawa, Satoshi Kawata, Sareeya Bureekaew, Soracha Kosasang, Yoshiyuki Kawazoe, Koji Ohara, Morten M. Smedskjaer, Satoshi Horike
Summary: This study successfully prepared the glassy state of Prussian blue analogues (PBAs) via a mechanically induced crystal-to-glass transformation, and explored their properties. The results showed that the glassy state PBAs retained short-range metal-ligand-metal connectivity, enabling framework functionality and semiconductivity. The transformation also generated unconventional CN- vacancies and reduced metal sites, resulting in enhanced porosity in recrystallised PBA.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
H. Es-Soufi, L. Bih, Alan R. F. Lima, A. El Bouari, B. Manoun, S. Hussain
Summary: Solid electrolytes-based lithium phosphates have made significant progress due to safety concerns in lithium-ion batteries. Investigating glasses within specific compositions revealed variations in chemical durability and crystallization mechanisms, with TiO2 primarily acting as network forming units.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
B. Pan, D. Zhu, M. Zhang
Summary: This paper introduces a flexible thermal sensor that can be used on robotic fingers to achieve rapid measurement of thermal conductivity and thermal diffusivity for different materials. By a single touch of the robot finger, the thermal properties of an object can be measured in less than 2 seconds.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Editorial Material
Physics, Multidisciplinary
Denys Makarov
Summary: The research team successfully demonstrated an experimental realization of an artificial spin glass, utilizing an arrangement of Ising-type permalloy nanomagnets to mimic the structure of artificial spin ice, along with a particular type of neural network.
Article
Chemistry, Physical
Asad Ali, Young-Han Shin
Summary: In this study, we utilized USPEX and VASP to discover three new structures of 2D GexSy compounds, and analyzed their electronic structures and thermal conductivity properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yao Liu, Houbo Zhou, Zhitong Xu, Die Liu, Jian Li, Fengxia Hu, Tianyu Ma
Summary: The thermal conductivity of neopentylglycol was enhanced by compositing it with graphene nanosheets, offering a simple and feasible way to accelerate the application of these materials in the solid-state refrigeration technique.
MATERIALS RESEARCH LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Raagya Arora, Umesh V. Waghmare, C. N. R. Rao
Summary: A theoretical analysis has demonstrated that weakly broken symmetry of parent simple-cubic crystals of Group V metalloids leads to the emergence of metavalent bonding (MVB) in rocksalt chalcogenides. MVB mediates strong coupling between conduction and valence bands, making the crystals highly polarizable, conductive, and sensitive to bond-lengths. However, stronger symmetry-breaking transforms them discontinuously into covalent and ionic semiconducting states.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
J. Stroh, T. Hess, L. Ohrt, H. Fritzsch, M. Etter, A. -C. Dippel, L. D. Nyamen, H. Terraschke
Summary: The structural evolution during the formation of CdS and ZnS in solution was studied using in situ luminescence spectroscopy, synchrotron-based X-ray diffraction (XRD) and pair distribution function (PDF) analyses. The influence of precursor type, concentration, temperature and heating program on the product formation and on the bandgap or trap emission were investigated. The formation of reaction intermediates, which are usually undetected by ex situ characterization approaches, highlights the importance of in situ analysis for the production of tailored semiconductor materials.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Crystallography
Marius Wolpmann, Martin Etter, Andrea Kirsch, Filippo Balzaretti, Wilke Dononelli, Lars Robben, Thorsten M. Gesing
Summary: Sodalites of different types with halide ions have been synthesized and their structures have been studied using various experimental and computational methods. The results indicate that the local structures of these compounds may deviate from the known average structures and may not be cubic.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Paribesh Acharyya, Koushik Pal, Abdul Ahad, Debattam Sarkar, Kewal Singh Rana, Moinak Dutta, Ajay Soni, Umesh V. Waghmare, Kanishka Biswas
Summary: The thermal conductivity of all-inorganic halide perovskite Cs3Bi2I9 is found to be very low due to the interaction between bismuth and iodine, causing soft elasticity and strong lattice anharmonicity.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Charlotte Koschnick, Maxwell W. Terban, Stefano Canossa, Martin Etter, Robert E. Dinnebier, Bettina V. Lotsch
Summary: Controlled synthesis of phase-pure metal-organic frameworks (MOFs) is crucial, but little is known about the role of water in their formation. This study found that water is not only essential for the formation of Zr6O4(OH)4 clusters, but also plays a decisive role in the kinetics of dPCN-224 formation. The multidisciplinary approach used provides valuable insights for assessing and improving the reproducibility of Zr-MOF synthesis protocols, emphasizing the importance of understanding the role of water in Zr-MOF formation.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Priyanka Jain, Gayatri Kumari, Meha Bhogra, Premakumar Yanda, Boby Joseph, Umesh V. Waghmare, Chandrabhas Narayana
Summary: It is found that ZIF-4 undergoes an open to narrow pore transition under vacuum conditions at temperatures below 253K, which is facilitated by C-H...π interactions. The adsorption behavior of N2 and CO2 on ZIF-4 leads to characteristic Raman spectral changes at 293K and 1 atm. The preferred adsorption sites on ZIF-4 are determined to be C-Hs, and low temperature adsorption of N2 leads to shear distortion and volumetric expansion of the ZIF-4 structure.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ivy Maria, Raagya Arora, Moinak Dutta, Subhajit Roychowdhury, Umesh V. Waghmare, Kanishka Biswas
Summary: In this study, the researchers investigated the intrinsic lattice shearing in TlBiSe2 induced by dual 6s2 lone pairs, and found that the structure shuttles between different energetically accessible low-symmetry structures, which strongly suppresses the lattice thermal conductivity. By utilizing metavalent bonding and cooperative movement of the constituent atoms, a low thermal conductivity and a high thermoelectric performance were achieved in TlBiSeS.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Ophthalmology
Rucha K. Borkhetaria, Nitya Devireddy, Nathan Cannon, Ajay Soni, Amanda L. Ely
Summary: This study aims to assess the information related to pediatric ophthalmology on TikTok. The top 20 videos for each of the 12 commonly searched terms were analyzed for various factors such as views, likes, comments, saves, shares, author status, and content. The study reveals a varying quality and understandability of pediatric ophthalmology content on TikTok, emphasizing the need for further research to ensure evidence-based medical content reaches pediatric patients and their families.
JOURNAL OF PEDIATRIC OPHTHALMOLOGY & STRABISMUS
(2023)
Article
Chemistry, Multidisciplinary
Manuel Hinterstein, Lucas Lemos da Silva, Michael Knapp, Alexander Schoekel, Martin Etter, Andrew Studer
Summary: Complex functional materials are important in energy-related applications and materials science. Understanding their structural mechanisms is challenging due to correlated coexisting phases and microstructures. This study demonstrates that neutron diffraction can be used to investigate such complex materials, revealing details of phase transformation under applied electric fields in barium titanate, and uncovering the strain and stress mechanisms involved.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Review
Materials Science, Multidisciplinary
Kewal Singh Rana, Ajay Soni
Summary: This review discusses the impact of multiple scattering channels on the ultralow lattice thermal conductivity in complex bulk chalcogenide minerals. The focus is on Ag- and Cu-based large unit cell structures with low heat capacity and liquid-like superionic conduction. The presence of a large number of atoms in the unit cell leads to low acoustic phonons cut-off frequency, robust acoustic-optical phonons scattering, poor sound velocity, and strong crystal anharmonicity inside the lattice.
OXFORD OPEN MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Riddhimoy Pathak, Lin Xie, Subarna Das, Tanmoy Ghosh, Animesh Bhui, Kapildeb Dolui, Dirtha Sanyal, Jiaqing He, Kanishka Biswas
Summary: In this study, high thermoelectric performance with a zT value of 2.3 was achieved in Ag vacant Ag1-xSbTe2 by optimizing the atomic disorder rooted in the thermodynamic phase diagram. The formation of AgSbTe2 and the introduction of Ag vacancies reduced the disorder in the semiconductor crystal, leading to increased electrical conductivity and power factor, as well as reduced lattice thermal conductivity due to the formation of nanoscale superstructures.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Divya Rawat, Aditya Singh, Niraj Kumar Singh, Ajay Soni
Summary: Angle-resolved polarization Raman spectroscopy of single crystal of Bi2Se3 reveals the elements of Raman tensor, providing insights into the strength of polarization along different crystallographic orientations. Intensity variations in polar plots corresponding to specific phonon modes suggest higher differential polarizability along the bc plane. These findings provide evidence of fundamental electron-phonon and anisotropic light-matter interactions in Bi2Se3.
Article
Chemistry, Multidisciplinary
Animesh Bhui, Subarna Das, Raagya Arora, Usha Bhat, Prabir Dutta, Tanmoy Ghosh, Riddhimoy Pathak, Ranjan Datta, Umesh V. Waghmare, Kanishka Biswas
Summary: Defect engineering, achieved by precise tuning of atomic disorder, can significantly enhance thermoelectric performance. The introduction of Hg doping into AgSbTe2 reduces structural disorder, increases carrier mobility, and lowers lattice thermal conductivity. A high thermoelectric figure-of-merit, zT, is achieved at 570K.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Patrick A. Julien, Mihails Arhangelskis, Luzia S. Germann, Martin Etter, Robert E. Dinnebier, Andrew J. Morris, Tomislav Friscic
Summary: In this study, a tandem spectroscopic method combining fluorescence emission and Raman spectroscopy, accompanied by periodic time-dependent density-functional theory (TD-DFT) modelling, is developed to observe and interpret the structural changes during mechanochemical reactions in real time. This method demonstrates its capability in monitoring the supramolecular structure changes of the model pharmaceutical indometacin during mechanochemical polymorph transformation and cocrystallization.