Article
Chemistry, Physical
Iqra Irshad, Abdul Gaffar Lone, Basharat Want
Summary: This study investigates the magnetic, dielectric, and optical properties of Cr-doped hematite nanostructures. The results show enhanced ferromagnetic characteristics, increased coercivity, and improved dielectric properties with Cr doping. The optical absorption edges are reinforced to higher wavelengths, and the optical bandgaps are reduced. These modified nanostructures have potential applications in spintronics, optoelectronics, and magneto-optical devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Prince George, Pradip Chowdhury
Summary: This work systematically investigates the doping of sulfide ions (S2-) on photoactive MIL-53(Fe) and evaluates its performance. The study found that doping can influence the optical band-gap energy of materials, but this does not always lead to improved performance in photocatalytic reactions, especially for hybrid materials like Metal Organic Frameworks (MOFs). By varying the percentage of dopant in the reaction mixture, the study explored the effects of doping on the structural conformations and optical properties of MIL-53(Fe), demonstrating changes in band-gap energy and electron cloud expansion. The best performance in terms of MB degradation was observed for 1% S doped MIL-53(Fe) and the material showed stability even after multiple cycles, indicating potential for practical applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
M. A. K. Yousaf Shah, Sajid Rauf, Bin Zhu, Naveed Mushtaq, Muhammad Yousaf, Peter D. Lund, Chen Xia, Muhammad Imran Asghar
Summary: A chemically stable perovskite semiconductor Nb-doped SrTiO3-delta (STN) electrolyte for SCFCs demonstrated high power density and open-circuit voltage at 520 degrees C. The high ionic conductivity was attributed to increased oxygen vacancies and band gap modulation, while band bending at the electrode/electrolyte interface helped prevent short circuits. Doping and energy band gap modulation were shown to be effective strategies for advanced semiconductor electrolyte development in SCFCs.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Cuiyuan Chai, Hong Liu, Weiwei Yu
Summary: The study shows that strain can achieve tunable band structures and optical properties of Fe, Co, Ni and Cu doped ZnO monolayer, such as indirect-direct band gap transition, shrink and enlargement of band gaps. This indicates a possible new route for tailoring the electronic properties of ultrathin nanofilms through strain engineering.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Materials Science, Ceramics
Bipin Kumar Parida, R. N. Bhowmik
Summary: The effects of Fe and La doping in the SnO2 structure were investigated by synthesizing the material using mechanical alloying and post-heat treatment. The material showed a bi-phased lattice structure consisting of tetragonal SnO2 structure and a secondary phase. Fe2O3 and La2O3 were identified as the secondary phases for Fe and La-doped SnO2, respectively. The N2 atmosphere played a crucial role in forming the single-phased structure and determining the phase fraction. Fe and La doping reduced the band gap energy and Fe-doped samples showed higher electrical conductivity. The nitrogen environment during synthesis and heat treatment influenced the electrical conductivity and dielectric properties of the samples.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ankur Sharma, Pinki Yadav, R. Bhatt, M. Soharab, Gurvinderjit Singh, Indranil Bhaumik
Summary: Single crystals of undoped and Nb doped NBT-KBT were grown by spontaneous nucleation technique, with the refractive index found to increase linearly with temperature and the thermal coefficient increasing with Nb concentration. Regions with both tetragonal and rhombohedral structures were observed, suggesting a possible coexistence of both structures.
Article
Chemistry, Physical
Xianyu Chu, Fanling Meng, He Yang, Wei Zhang, Tingting Qin, Zizhun Wang, Sebastian Molin, Piotr Jasinski, Weitao Zheng
Summary: In this study, Cu-doped Co-based LDH materials were prepared as electrode materials with excellent conductivity and charge transfer capability. The introduction of copper increased the electron density of cobalt-based hydroxide, resulting in improved charge storage capacity. The fabricated CuCo-LDH electrode exhibited high energy density and remarkable cycling stability.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ethan Chi Ho Wen, Peter H. Jacobse, Jingwei Jiang, Ziyi Wang, Steven G. Louie, Michael F. Crommie, Felix R. Fischer
Summary: Substitutional heteroatom doping in 1D graphene nanoribbons is a versatile tool for low-dimensional functional materials, but previous methods only result in modest realignment of energy levels. This study introduces nitrogen core-doped armchair GNRs that yield greater energy-level shifting through the substitution of carbon atoms with nitrogen atoms along the backbone.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Majibul Haque Babu, Bidhan Chandra Dev, Jiban Podder
Summary: An investigation on the Fe-doping effect on SnO2 thin films was conducted using the TSP method. The study found that the Fe-doping content affects the surface morphology, crystallite size, preferential growth orientations, crystal phase types, electrical properties, and optical properties of the films.
Article
Engineering, Electrical & Electronic
S. Aydin
Summary: In this study, the effects of Ho-doping rate on the electronic and optical properties of ZnO films were analyzed using First Principles calculations. The band structure, optical properties, and density of states of different Ho-doped ZnO samples were calculated and compared. The results showed that the band gap first decreased and then increased with increasing Ho content, and the optical properties of Ho-doped ZnO exhibited blue shift and red shifts in various characterizations. The calculations confirmed that Ho-doping could heal ZnO and were consistent with experimental results.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Zelin Xia, Shuang Xing, Hualin Wang, Dongyang Zhao, Sumei Wu, Weiwei Jiang, Nan Wang, Shimin Liu, Chaoqian Liu, Wanyu Ding, Zhihua Zhang
Summary: Fe-doped TiO2 nanoparticles with pure anatase structure and spherical morphology were successfully synthesized through coprecipitation method. The crystallite size increased with the increase of calcination temperatures. Fe doping decreased the energy band gap (Eg) of TiO2, leading to enhanced photocatalytic performance. The maximum degradation efficiency of methyl orange (MO) reached 46.3% under visible light irradiation for Fe-doped TiO2 nanoparticles with a Fe doping concentration of 0.3 at.% and calcination temperature of 300?.
Article
Polymer Science
Trung Vu Quoc, La Trieu Duong, Van Duong Quoc, Tuan Tran Quoc, Dung Nguyen Trong, Stefan Talu
Summary: The structural features of C13H8OS-X were studied using PDOS and DOS package of the MS software, showing insignificant changes in bond length and bond angle between atoms. Doping C13H8OS-X with different elements led to constant values in bond lengths and angles, with significant changes observed in C-X bonds. The total energy and energy bandgap also showed variations with different doping orders.
DESIGNED MONOMERS AND POLYMERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Seyedeh Shadi Saeidi, Behrooz Vaseghi, Ghasem Rezaei, Habibollah Khajehshari, David Jenkins
Summary: The effects of Fe and Co dopants on the optical bandgap and structural, morphological, and magnetic properties of VO2(A) nanobelts were studied in this work. The XRD analyses revealed that the hydrothermal method promotes the formation of VO2(B) and causes the tetragonal-monoclinic transformation in VO2. The results show an increment in the optical band gap with dopants and superparamagnetic behavior of the samples at room temperature.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Mohammad Humaun Kabir, Humayra Ibrahim, Sikder Ashikuzzaman Ayon, Md. Muktadir Billah, Sharif Neaz
Summary: In this study, undoped and Fe-doped CuO thin films were prepared using the sol-gel spin coating technique. It was found that Fe doping improved the particle size and distribution, and tuned the bandgap of the films. In addition, the films showed good optical properties and antifungal activity.
Article
Engineering, Environmental
Ruonan Min, Yanxia Wang, Xue Jiang, Rongchun Chen, Huijun Kang, Enyu Guo, Zongning Chen, Xiong Yang, Tongmin Wang
Summary: By doping Nb into ZrNiSn-based compounds, the thermoelectric and mechanical properties have been significantly improved, with enhanced power factor and reduced thermal conductivity. This research demonstrates the potential for industrial applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
J. Longji Dadiel, Naomichi Sakai, Kazuya Yokoyama, Kento Takemura, Tetsuo Oka, Jacques Noudem, Miryala Muralidhar, Masato Murakami
Summary: This study investigates the degradation of trapped fields in bulk MgB2 superconductors caused by flux jumps and presents a method to improve thermal properties and suppress flux jumps. The performance of the improved bulk MgB2 is evaluated by analyzing the magnetic flux dissipation and motion. The study provides experimental evidence for the development of high-field applications in bulk MgB2 superconductors.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Materials Science, Multidisciplinary
Muralidhar Miryala, Kotaro Kitamoto, Sai Srikanth Arvapalli, Dhruba Das, Milos Jirsa, Masato Murakami, Sri Ramachandra Rao Mamidanna
Summary: A certain increment in critical current density (J(c)) of bulk MgB2 has been achieved by using amorphous boron precursor and Dy2O3 doping. The optimal doping range of Dy2O3 is found to be 0.5-1.5 wt%, resulting in a high self-field J(c) of approximately 380 kA cm(-2) at 20 K. An improved high-field performance of 90 kA cm(-2) at 2 T, 20 K is observed with 1 wt% Dy2O3 doping. Raman studies show an increase in the phonon density of states (PDOS) with increasing Dy2O3 doping.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Physics, Applied
T. Oka, K. Sudo, J. L. Dadiel, N. Sakai, H. Seki, M. Miryala, M. Murakami, T. Nakano, M. Ooizumi, K. Yokoyama, M. Tsujimura
Summary: This article introduces a unique magnetic separation technique using high temperature superconducting bulk magnet to collect nickel sulfate crystals from nickel-plating waste liquid. This method offers a novel way for recycling nickel resources.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yiteng Xing, Pierre Bernstein, Muralidhar Miryala, Jacques G. Noudem
Summary: In this study, in situ MgB2 superconducting samples were prepared using the spark plasma sintering method. The samples exhibited high critical current densities and strong vortex pinning ability, which can be attributed to the sample density and the presence of MgB2 nanograins in connection to MgO precipitates and areas rich in boron.
Article
Physics, Applied
Ankit Arora, Kolla Lakshmi Ganapathi, Tejendra Dixit, Muralidhar Miryala, Murakami Masato, M. S. Ramachandra Rao, Ananth Krishnan
Summary: In this study, we investigated the direct current (dc) current-voltage characteristics of few-layer muscovite mica (MuM) flakes transferred onto a SiO2/Si substrate. We observed an increase in in-plane electrical conductivity with decreasing thickness of the MuM flakes, contrary to conventional two-dimensional systems. Through analysis of the I-V characteristics and conduction mechanism, we found that the Fermi level moved towards the conduction band with decreasing thickness, leading to an increase in conductivity in thinner flakes possibly due to surface doping.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Yohann Thimont, Yiteng Xing, Pierre Bernstein, Muralidhar Miryala, Jacques Noudem
Summary: In this study, MgB2 pellets sintered from commercial MgB2 powder using Spark Plasma Sintering (SPS) were soldered and compared to unsoldered samples. Microscopic observations and magnetic property tests showed that the soldered pellets exhibited the same performance as the unsoldered ones. This new soldering technique could be applied in manufacturing superconducting devices with custom shapes.
Article
Materials Science, Multidisciplinary
S. Kundu, A. Pal, Amit Chauhan, K. Patro, K. Anand, S. Rana, V. G. Sathe, Amish G. Joshi, P. Pal, K. Sethupathi, B. R. K. Nanda, P. Khuntia
Summary: In this paper, the electronic structure and magnetic properties of an ordered double perovskite material, Ho2CoMnO6, are reported. The material exhibits long-range ferromagnetic ordering as well as inherent antisite disorder and complex exchange interactions.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Applied
M. Muralidhar, A. Sai Srikanth, S. Pinmangkorn, M. Santosh, J. Milos
Summary: This study presents progress in the mass production of newly developed (Gd0.33Y0.13Er0.53)Ba2Cu3Oy (Gd,Y,Er)123 and MgB2 superconductors. Single-grain (Gd,Y,Er)123 samples of 20 mm diameter and 7 mm thick were successfully prepared using an infiltration growth process. The trapped field values of these samples exceeded 0.5 T at 77 K. Additionally, the use of ultrasonication technique refined the boron powder to the nanoscale, leading to a 36% improvement in the critical current of bulk MgB2 at 20 K and self-field. This progress promotes the commercialization of high-performance superconductors as sustainable technology.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Physics, Applied
T. R. Rajalekshmi, Vikash Mishra, Tejendra Dixit, Pankaj R. Sagdeo, M. S. Ramachandra Rao, K. Sethupathi
Summary: In this study, the origin of three energy gaps in lanthanum chromium oxide is analyzed using diffuse reflectance spectroscopy. The results show charge-transfer and d-d transitions as the sources of the gaps. The use of Tanabe-Sugano diagram and absorption spectrum helps in understanding the spin allowed and parity forbidden transitions. The findings have significant implications in laser applications and the development of optoelectronic devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Review
Physics, Applied
Akshara Dadhich, Madhuvathani Saminathan, Kaushalya Kumari, Suresh Perumal, M. S. Ramachandra Rao, Kanikrishnan Sethupathi
Summary: The depletion of fossil fuels and the increasing demand for sustainable energy sources have led to the search for alternative energy sources. This review discusses the impact of materials on device performance and the challenges in enhancing thermoelectric (TE) performance. It also emphasizes recent approaches to improve TE performance and the role of crystal structure and magnetic elements.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yan Jing Wong, Lik Nguong Lau, Kean Pah Lim, Xiao Tong Hon, Nur Amira Azira Daud, Mohd Mustafa Awang Kechik, Soo Kien Chen, Muhammad Kashfi Bin Shabdin, Abdul Halim Shaari, Muralidhar Miryala
Summary: This study reports on a revisited investigation of perovskite-based manganite La0.67Sr0.33MnO3 (LSMO) deposited onto corning-glass (CG) substrates. LSMO films with thicknesses ranging from 35.0-109.7 nm were fabricated using RF sputtering with different deposition times. The films exhibited hexagonal structures with an unmodified R-3c (167) space group. AFM images revealed clusters of monolayer growth. The optical band gap (Eg) showed a direct variation with deposition time, while the resistivity graphs were fitted using the percolation model to understand the electrical transport.
Article
Chemistry, Physical
Akash Garg Agarwal, Muralidhar Miryala
Summary: In this study, different compositions of liquid sources were used to optimize the superconducting properties and microstructure of bulk superconductors. Er123 + Ba3Cu5O8(1:1) liquid source significantly reduced the size of 211 secondary phase particles compared to the conventional Ba3Cu5O8. The liquid source composition had a significant impact on the superconducting properties, and the Er123 + Ba3Cu5O8 liquid source yielded the highest critical current density (Jc) for the (Gd, Y, Er)-123 ternary system.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Coatings & Films
Ajay Kumar, Ramcharan Meena, M. Miryala, K. Ueno, Rajendra S. Dhaka
Summary: The effect of growth orientation on the structural, electronic, and transport properties of Sr2CoNbO6 thin films grown on NGO(100) and MgO(100) substrates is studied. The thin film grows along the a axis on NGO(100), resulting in asymmetric (b ? c) in-plane compressive strain, while it grows along the c axis on MgO(100) with tensile strain. Lower electronic conductivity is observed for the film grown on NGO(100), which is correlated with higher oxygen deficiencies and a larger concentration of insulating Co2+. X-ray photoemission spectroscopy measurements show different valence states for Sr, Nb, and Co, with some variation depending on the growth orientation. Leakage current analysis indicates the presence of two relaxation mechanisms in these samples.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Multidisciplinary
Siti Nabilah Abdullah, Mohd Mustafa Awang Kechik, Aliah Nursyahirah Kamarudin, Zainal Abidin Talib, Hussein Baqiah, Chen Soo Kien, Lim Kean Pah, Muhammad Khalis Abdul Karim, Muhammad Kashfi Shabdin, Abdul Halim Shaari, Azhan Hashim, Nurbaisyatul Ermiza Suhaimi, Muralidhar Miryala
Summary: The effects of adding graphene on the phase formation and superconducting properties of Bi-2223 ceramics were investigated. Graphene nanoparticles with different weight percentages were added to Bi-2223 samples. XRD and ACS techniques were used to analyze the phase formations and superconducting critical temperatures. The results show that the addition of graphene affects the phase composition and decreases the critical temperatures of the samples.
Article
Social Work
Masaki Murahashi, Kaichiro Tamba, Tomoaki Takanashi
Summary: This qualitative study conducted in Japan aimed to identify factors related to terminal cancer patients' trust in their palliative care doctors. The findings revealed factors such as caring attitude, symptom management, courteous and specific explanations, long-term involvement in the patient's care, being faced with inevitable death, good impression of the institution, and referral by a trusted doctor that contribute to patients' trust.
JOURNAL OF SOCIAL WORK IN END-OF-LIFE & PALLIATIVE CARE
(2023)
