Article
Chemistry, Physical
Bablu Chandra Das, A. K. M. Akther Hossain
Summary: The room temperature magnetoelectric coupling in xNi(0.48)Cu(0.12)Zn(0.40)Gd(0.04)Fe(1.96)O(4) + (1-x)Ba0.985Ca0.015Zr0.10Ti0.90O3 multiferroic composites was thoroughly investigated. Structural analysis using X-ray diffraction showed a biphasic spinel-perovskite structure. The dielectric constant decreases with the addition of ferrite content, in line with theoretical estimations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
Yuanmao Pu, Zhibin Qiu, Bing Lv, Chuanli Fang, Yaya Lou, Wenzhong Wang, Qingping Dai
Summary: Based on density functional theory, the effect of calcium and zirconium doping on the structure, elastic, optical, Debye temperature, and piezoelectric properties of tetragonal BaTiO3 has been studied. The results show that calcium reduces the volume of BaTiO3 while zirconium increases it. Doping with calcium, zirconium, and their combination leads to an increased band gap of BaTiO3. Additionally, the co-doping of calcium and zirconium significantly enhances the piezoelectric performance of BaTiO3. This study provides theoretical guidance for improving the piezoelectric properties of BaTiO3 through doping strategies.
MODERN PHYSICS LETTERS B
(2023)
Article
Materials Science, Multidisciplinary
Deepshikha Shekhawat, Imteyaz Ahmad, P. K. Roy
Summary: This study successfully synthesized single-phase strontium hexaferrite using the sol-gel auto combustion method, and analyzed the substitution of transition metal ions, showing that the substitution of Co+3 significantly enhanced the magnetic properties of the ferrites.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Ruby Priya, Piyush Sharma, Dinesh Kumar, Smriti, O. P. Pandey
Summary: The study reported the easy synthesis of phase pure and crystalline Eu doped BaTiO3 phosphors via solid-state method. The synthesized samples showed potential applications in optoelectronic and display devices, with characteristics including excitation by near UV and visible blue light, emission intensity at 617 nm under 465 nm excitation, and bi-exponential decay curves. The results were characterized using XRD, FESEM, UV-Visible, and photoluminescence techniques, along with Rietveld refinement and Dexter and Blasse's theory.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Materials Science, Ceramics
Long Chen, Qingqiao Fu, Zuojian Jiang, Juanjuan Xing, Yan Gu, Faqiang Zhang, Ying Jiang, Hui Gu
Summary: The study on BaTiO3 ceramics doped with Mg, Ca and Dy showed that the core-rim structure of grains formed by these elements can delay the migration of oxygen vacancies, thus extending the material's lifetime.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Meenal Chauhan, Ekta Arya, Anand Kumari, Sujata Sanghi, Ashish Agarwal
Summary: Multiferroics with composition yNiFe2O4 -(1-y) BaTiO3(y = 0.10, 0.30, and 0.50) were prepared through solid-state reaction. The crystal structure and phase purity of the samples were investigated using X-ray diffraction (XRD) analysis. Rietveld refinement confirmed the presence of cubic (Fd3m) and tetragonal (P4mm) symmetries in all samples. The effect of ferrite (NFO) concentration on magnetic, dielectric, ME coefficient, and ferroelectric properties was further studied. The highest magnetoelectric response was observed in the sample 0.10NiFe2O4-0.90BaTiO3. The coercive field and remnant polarization increased with an increment in ferrite content at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Muhammad Habib, Myang Hwan Lee, Da Jeong Kim, Fazli Akram, Hai In Choi, Myong-Ho Kim, Won-Jeong Kim, Tae Kwon Song
Summary: By studying three different series of lead-free ceramics, two morphotropic phase boundaries (MPBs) were discovered, revealing the relationship between piezoelectric performance and crystal structure. The significant enhancement in piezoelectric strain response due to local structural heterogeneity caused by La3+ doping serves as the basis for the improvement in ceramic performance.
JOURNAL OF MATERIOMICS
(2021)
Article
Chemistry, Physical
Xuewen Jiang, Hua Hao, Yang Yang, Enhao Zhou, Shujun Zhang, Ping Wei, Minghe Cao, Zhonghua Yao, Hanxing Liu
Summary: This study confirmed that Ca ions can substitute the Ti site in BaTi1-xCaxO3-x ceramics, greatly improving the low-temperature stability of dielectric constant. By introducing Bi3+ and Zn2+, the dielectric-temperature stability can be further enhanced. The 0.85BTC4-0.15BZT ceramics showed excellent temperature coefficient of capacitance and dielectric properties, meeting higher standards in the current capacitor industry.
JOURNAL OF MATERIOMICS
(2021)
Article
Materials Science, Multidisciplinary
M. Arshad, M. Abushad, M. Azhar, Hilal Ahmed, M. Nadeem, Azizurrahaman Ansari, Vishal Kumar Chakradhary, Shahid Husain, Wasi Khan
Summary: By doping a small amount of Pb into BaTiO3 through a solid-state reaction, the multiferroic properties of the compound have been improved, showing potential applications in the field of microwave tunable devices and multi-layered ceramics capacitors.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Jaures Syntyche Ndzila, Jiaming Wu, Guojian Jing, Zhengmao Ye, Tianyu Lei, Qingchun Yang, Shuxian Wang, Xin Cheng
Summary: This study investigates the effects of Ga3+ ion doping on the phase transition mechanism and Eu3+ ion crystal-field splitting in Sr4Al6O12SO4 structure. Experimental results show that the addition of Ga3+ ions facilitates the phase transition process and successfully preserves the metastable I23 phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Navya Sara Kuriyan, P. S. Ghosh, A. Arya, M. Sabeena
Summary: The luminescence of Eu3+ doped calcium magnesium silicate (CMS: Eu3+) phosphor was experimentally studied by optimizing the single diopside structure in the solid state reaction method and theoretically verified using first principle density functional theory (DFT) calculation. The results showed that a transition from agglomerated morphology to particle formation occurred at 900 degrees C, and a combination of diopside and akermanite structures were formed at 800 degrees C, while a single diopside phase was optimized from 900 degrees C onwards. The stability and site preference of Eu3+ ion in CMS were determined through DFT calculation, indicating that Eu3+ replacing Ca lattice position had the minimum mixing energy.
JOURNAL OF LUMINESCENCE
(2023)
Article
Materials Science, Multidisciplinary
Jiayan Huang, Ran Chen, Juanjuan Xing, Faqiang Zhang, Ying Jiang, Yan Gu, Hui Gu
Summary: This study prepared a series of core-rim structured 95BaTiO(3)-2CaO-2MgO-1Dy(2)O(3) ceramics by controlling the sintering time and investigated the formation mechanism, evolution process, and effect on electric properties of the core-rim structure. Through the analysis of microstructure evolution in morphology, composition, and defects, a multi-scale evolution mechanism was proposed. The experimental results showed that dense ceramics with a core-rim structure and a density of 96.5% could be obtained by limiting the holding time to 5 minutes, and the core-rim structure had a significant effect on the electric properties.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
Melike Tokkan, Mustafa M. Demir, Umut Adem
Summary: We report an enhancement of the electrocaloric effect in solution cast polymer nanocomposites based on P(VDF-TrFE) 55-45 with Ca and Sn co-substituted BaTiO3 ceramic fillers (BCST). By utilizing the indirect method, the electrocaloric properties were estimated using saturated hysteresis loops and normal ferroelectric behaviour. The dielectric constant and electrocaloric temperature change increased as the particle content increased, with a maximum adiabatic temperature change of 6.96 K achieved under 900 kV/cm for the 10 vol% BCST containing polymer composite near the copolymer's Curie temperature (70 degrees C). However, the electrocaloric strength was slightly lower compared to terpolymer-based nanocomposites.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Multidisciplinary
Tahir Ahmad, Monika Tomar, Kajal Jindal, Pradip K. Jha
Summary: The structural, electronic and optical properties of Ca doped SBN60 were studied using first principle calculations. The bandgap was found to be dependent on the coordination of the doping sites. Ca was found to prefer occupying the pentagonal sites. Furthermore, anisotropy in optical properties was observed in doped and undoped SBN60, making it a promising material for optoelectronic device applications.
Article
Materials Science, Multidisciplinary
Adel Madani, Manar Alghamdi, Bedour Alamri, Shoaa Althobaiti
Summary: Barium titanate ceramics synthesized using the solid-state method were investigated for their optical properties and phase transition characteristics. X-ray diffraction and scanning electron microscopy revealed a perovskite structure. The grain size of doped barium titanate ceramics decreased with increasing concentration of Sb2O3 or Y2O3. XRD investigation showed the formation of a cubic crystal structure. The concentration of (Sb, Y) affected the structure, including the appearance of tetragonal phases, grain size reduction, and microstructure development. The absorption coefficient, extinction coefficient, and refractive index were also studied.
Article
Instruments & Instrumentation
Taisei Hayashi, Kensei Ichiba, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Cr-doped Mg4Ta2O9 single crystals with different doping levels were synthesized using the floating zone method, and their photoluminescence and scintillation properties were evaluated. The results showed that Cr-doped Mg4Ta2O9 single crystals exhibited broad emission bands in the near-infrared region and showed scintillation characteristics within specific wavelength ranges. Additionally, the samples with different Cr doping levels demonstrated different lower detection limits based on the dose rate response function.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
S. Marouf, A. C. Chami, Y. Boudouma
Summary: This study develops a Monte Carlo simulation approach to describe proton-induced secondary electron emission in solids. Theoretical modeling based on the Mott's elastic scattering cross-section and Lindhard's dielectric function was used to calculate the double differential cross-section (DDCS) of excited electrons and describe electron transport in the medium. The results for aluminum show the angular and energy distributions of backscattered electrons for incident protons with energy below 25 keV at normal incidence, and the total electron emission yield also agrees well with available measurements.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
Weipeng Yan, Baojun Duan, Zijian Zhu, Yan Song, Guzhou Song, Jiming Ma, Binkang Li, Yucheng Liu
Summary: This article reports on the scintillation performance of Lithium-doped 2D (PEA)2PbBr4 perovskite single crystals synthesized at room temperature. The crystals exhibit fast decay time, high light yield, and high spatial resolution, making them highly promising for medical diagnostic applications.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
S. B. Vishwakarma, S. K. Dubey, R. L. Dubey, I. Sulania, D. Kanjilal
Summary: Investigations have been conducted on the implanted SiO2 thin film after thermal annealing using various analytical techniques. The results revealed the absence of vacancy defects, variations in vibrational modes and the formation of new structures. The photoluminescence intensity of the annealed SiO2 samples was higher, with a decrease in non-radiative defect centers and an increase in radiative Si:SiO2 interface states. Additionally, the presence of silicon nanoclusters formed after annealing resulted in an additional radiative recombination peak. Furthermore, the formation of new SiOx structures was observed after thermal annealing.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
M. Koshimizu, S. Kurashima, A. Kimura, M. Taguchi
Summary: By observing the scintillation time profiles of CeF3 under irradiations of pulsed beams with different LETs, we found that the initial decay was faster for higher LET, which is consistent with previous studies on other self-activated scintillators. This faster decay at higher LET can be explained by the competition between the scintillation caused by 5d-4f transition of Ce3+ ions and quenching due to the interaction between excited Ce3+ ions close to each other.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
Junjie Shi, Jianhong Hao, Fang Zhang, Qiang Zhao, Bixi Xue, Jieqing Fan, Zhiwei Dong
Summary: This study examined the neutralization process and beam quality of a hydrogen beam by emitting negative hydrogen ions to a hydrogen target. The findings showed that the neutralization efficiency was influenced by variables such as the transport distance, energy, and target gas density. However, the maximal neutralization efficiency was not affected by the density of the target gas or the energy of the negative hydrogen ions.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)