Article
Materials Science, Ceramics
P. T. Tho, N. Tran, M. Y. Lee, N. Dang, P. T. Phong, L. T. Ha, H. T. Van, N. N. Tran, D. T. Khan, B. W. Lee, C. T. A. Xuan
Summary: Ceramic Bi1-xNdxFeO3 solid solutions with doping concentration ranging from 0.10 to 0.20 were prepared to investigate their structural evolution and magnetic properties. The study revealed a transition from polar rhombohedral to antipolar orthorhombic structures, along with the emergence of weak ferromagnetism at high doping concentrations due to the destruction of the cycloidal spin structure. Additionally, magnetic aging behavior at room temperature confirmed the contribution of phase boundary spins to the magnetic properties.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Dmitry V. Karpinsky, Maxim V. Silibin, Siarhei I. Latushka, Dmitry V. Zhaludkevich, Vadim V. Sikolenko, Hanan Al-Ghamdi, Aljawhara H. Almuqrin, M. I. Sayyed, Alexei A. Belik
Summary: The crystal structure and magnetic state of the (1 - x)BiFeO3-(x)BiMnO3 solid solution were analyzed. It was found that increasing the dopant concentration led to structural and magnetic transitions at room temperature, resulting in a two-phase structure. Irreversible temperature-driven structural transitions favored the stabilization of high-temperature structural phases.
Article
Chemistry, Physical
P. T. Tho, V. T. K. Lien, N. D. Vinh, L. T. Ha, P. T. Phong, D. Karpinsky, M. Silibin, V. V. Thu, L. T. Huy, C. T. A. Xuan, B. M. Quy
Summary: The structural transition and magnetic properties of Bi0.84La0.16Fe1-xMnxO3 ceramics crossing the Pbam/Imma phase boundary have been investigated. The mixed-phase compositions show weak ferromagnetism and exhibit intriguing magnetic properties. The observation of magnetic aging behavior provides convincing evidence for the dynamic behavior of phase boundary spins.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Materials Science, Multidisciplinary
Subhajit Nandy, Pavana S. Mocherla, E. Abdelhamid, B. Nadgorny, R. Naik, C. Sudakar
Summary: The study of magnetodielectric properties at thermal breaking temperature reveals the significant role of oxygen vacancies in altering the magnetodielectric behavior of BiFeO3, particularly in activating negative magnetodielectric response at high loads. Cation substitution reduces grain size, increases surface oxygen vacancies, and enhances magnetic properties.
Article
Materials Science, Ceramics
L. T. Ha, C. T. A. Xuan, K. T. Tam, N. D. Co, B. M. Quy, N. V. Dang, P. T. Phong, P. D. Thang, N. D. Long, P. M. An, N. D. Vinh, P. T. Tho
Summary: This study reports the detailed structural phase transition induced by chemical substitution in Bi1-xPrxFeO3 polycrystalline ceramics. Pr3+ substitution is found to destabilize the polar R3c symmetry due to the chemical strain effect caused by the large ionic radius mismatch at the Bi-site. The R3c rhombohedral phase can only be stabilized up to 14 mol% of Pr doping; the phase transition starts to appear at a higher Pr concentration, forming a morphotropic phase boundary between the R3c rhombohedral and Pbam orthorhombic phases. Increasing Pr concentration causes the magnetic transition from a pure antiferromagnetic to a weak ferromagnetic state due to the evolution of crystal structure.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Subhash Sharma, Manish Kumar, Gunjan Srinet, J. M. Siqueiros, Oscar Raymond Herrera
Summary: In this study, multiferroic ceramics Bi0.80La0.10Ca0.10Fe1-xMnxO3 were synthesized and two crystalline phases were found throughout the composition range. The addition of Mn enhanced the magnetic properties, leading to potential technological applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
D. V. Karpinsky, D. V. Zhaludkevich, S. I. Latushka, M. V. Silibin, V. I. Mitsiuk, N. N. Tran, P. T. Tho, N. Tran
Summary: The crystal structure of Bi0.86Sm0.14Fe1-xMnxO3 ceramic compounds prepared by solid state reaction method was analyzed using X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. Magnetic properties were studied using magnetometry measurements, revealing a correlation between the magnetic and crystal structures of the compounds. The compounds exhibited a coexistence of polar rhombohedral and antipolar orthorhombic phases for 0 ≤ x ≤ 0.1, with an increase in Mn doping stabilizing the orthorhombic phase. The magnetization data showed a gradual reduction in remanent magnetization with increasing Mn concentration at room temperature, and a nontrivial reduction in remanent magnetization was observed with decreasing temperature, indicating a transformation of the magnetic structure.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
D. A. Salamatin, S. E. Kichanov, I. E. Kostyleva, L. F. Kulikova, A. V. Bokov, I. P. Zibrov, D. P. Kozlenko, A. V. Tsvyashchenko
Summary: The substitution of Bi by rare-earth ions is an effective approach for enhancing the properties of BiFeO3. In this study, Bi1-xTbxFeO3 compounds were synthesized using a two-step process. High-pressure annealing was found to increase the solubility limit of Tb to 10 at. %. The transition from the R3c phase to the Pnma phase occurred through a two-phase region under certain pressures. The results provide insights for optimizing the synthesis of multiferroic materials with improved magnetoelectric coupling.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Jing Chen, Nan Su, Xiao Li Zhu, Xiao Qiang Liu, Jin-Xing Zhang, Xiang Ming Chen
Summary: Electric-field-controlled magnetism is achieved in the Bi1-xGdxFeO3 system, involving a field-induced transition of Pna21/R3c and reversible magnetism with annealing. This leads to more significant electric-field-controlled magnetism compared to other systems in a wider composition range.
JOURNAL OF MATERIOMICS
(2021)
Article
Chemistry, Physical
N. X. Ca, M. Y. Lee, N. T. M. Hong, D. N. Ba, P. T. Tho, N. Dang, N. Tran, B. W. Lee, L. T. Ha, L. T. Hue, C. T. A. Xuan
Summary: Systematic studies on Bi1-xDyxFeO3 systems at the morphotropic phase boundary reveal structural evolution from R3c to Pnma as Dy concentration increases, with two distinct phonon vibrations in coexisting phases and weak ferromagnetism observed in a composition dominated by Pnma phase. Pinched hysteresis loop and decreasing magnetization with increasing Dy concentration are explained by metamagnetic transition of antiferromagnetic clusters and contribution of phase boundary spins.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Guangzhi Dong, Huiqing Fan, Laijun Liu, Pengrong Ren, Zhenxiang Cheng, Shujun Zhang
Summary: The study fabricated a novel solid solution ceramic with relaxor ferroelectric features using high temperature solid-state reaction method. The ergodic composition showed large repeatable electrostrain value and high piezoelectric stain coefficient, while the non-ergodic compositions exhibited unrepeatable large strain response. The research aims to guide the design of lead free relaxor ferroelectric materials with desired electrostrain properties.
JOURNAL OF MATERIOMICS
(2021)
Article
Physics, Applied
Lu Liu, Xiao Li Zhu, Z. Gareeva, A. K. Zvezdin, Jose Antonio Eiras, Xiang Ming Chen
Summary: By substituting rare-earth ions, the ferroelectric polarization and weak ferromagnetism in BiFeO3 ceramics are enhanced, achieving electric field-controlled magnetism.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Ceramics
Lei Su, Xiang-Qun Zhang, Qiao-Yan Dong, Hai-Tao Yang, Shi-Hui Li, Zhao-Hua Cheng
Summary: The influence of Mn doping on TmFeO3 ceramics was studied, showing changes in structure, magnetic properties, and magnetocaloric effect. The transition temperature and magnetic properties were modified with increasing Mn substitution, leading to higher magnetic entropy changes and refrigeration capacities. The study provides valuable information for the potential application and development of RFeO3 materials.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Gaochao Zhao, Chengbing Pan, Wei Dong, Peng Tong, Jie Yang, Xuebin Zhu, Lihua Yin, Wenhai Song, Yuping Sun
Summary: In this study, modulation of magnetism by electric field in designed insulating multiferroics is demonstrated. By significantly enhancing the converse magnetoelectric effect near the morphotropic phase boundary, considerable and repeatable electric field-modulated magnetization is achieved at both room temperature and 350 K.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
S. Devesa, P. S. P. da Silva, M. P. Graca, M. Valente, L. C. Costa, J. A. Paixao
Summary: Bi1-xFexNbO4 (x = 0.25, 0.50, and 0.75) samples were synthesized using the sol-gel method, and their morphologic, structural, dielectric, and magnetic properties were studied. The dielectric constant and losses increased with the iron content, while AC conductivity depended on frequency in a manner that satisfied Jonscher's universal power law at different temperatures. The magnetic susceptibility doubled with increasing iron concentration, as observed in the curves of magnetization vs. magnetic field.
Article
Physics, Multidisciplinary
Shantanu Kumar Panda, Jyotirekha Mallick, Subhadeep Datta, Sambit Kumar Biswal, Shampa Guha, Manoranjan Kar
Summary: The observation of near room-temperature coupling of both magnetic and structural transitions in Fe substituted Mn-Ni-Si alloy leads to an interesting magneto-structural transition (MST) phenomenon which intensifies the required magnetocaloric parameters for magnetic cooling applications. The correlation between the unit cell parameters of both phases confirms that a large change in unit cell volume (similar to 2.9%) is mainly responsible for the structural transition. The simultaneous substitution of Fe across Ni and Mn sites helps to tune the MST temperature. The [Mn-0.64 Ni-0.64 Fe-0.72 Si] alloy exhibits a large isothermal magnetic entropy change (delta SM) of -19.2 +/- 0.4 J kg(-1) K(-1 )accompanied by a large value of effective refrigerant capacity (RCeffe) of 181.8 +/- 3.7 J kg(-1) due to a magnetic field change of 0-30 kOe. The estimated total entropy change associated with the complete structural transition from the calorimetric studies sets an upper limit for the entropy change of the system. The low cost and non-toxic nature of constituent elements, composition-dependent tunability of the transition temperature, and near room-temperature large magnetocaloric parameters make this alloy potentially suitable to be used as a refrigerant in solid-state magnetic cooling technology.
Article
Physics, Applied
Jyotirekha Mallick, Anant Shukla, Shantanu Kumar Panda, Murli Kumar Manglam, Sambit Kumar Biswal, Lagen Kumar Pradhan, Manoranjan Kar
Summary: The electrocaloric effect of lead-free Ba(0.8-x)Sr(0.2)SmxTiO(3) (x = 0.01-0.05) ceramics has been investigated, and it is found that adding Sm3+ can enhance the electrocaloric effect parameter and improve the temperature stability in a broad temperature window.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Ananthakrishnan Nitu, Ananthakrishnan Srinivasan
Summary: Magnetic interactions in sol-gel-derived bioactive magnetic glass-ceramics (MGCs) were studied using EPR, magnetic susceptibility, and magnetization techniques. The intensity and linewidth of resonance absorptions showed composition dependence. Dipolar interaction dominated in MGC samples with iron oxide content ≤ 4 wt.%, while a crossover to super-exchange interaction occurred in samples with higher iron oxide content. The magnetic behavior differed between MGC samples with iron oxide content ≤ 6 and ≥ 8 wt.%, with the latter exhibiting superparamagnetic behavior correlated with the percentage of magnetic phases present.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Physics, Condensed Matter
Subhadeep Datta, Murli Kumar Manglam, Shantanu Kumar Panda, Anant Shukla, Manoranjan Kar
Summary: The magnetic and structural properties of composites made from hard magnetic Barium hexaferrite (BHF) and soft magnetic Ni-Mn-Sn Heusler alloy were investigated. The composites undergo two distinct magnetic phase transitions, reflecting the alloy and BHF phases. When both phases exhibit ferromagnetic ordering, a magnetic biasing effect is observed, resulting in a squeezing in the magnetic hysteresis curve around H = 0. This squeezing effect could be advantageous in magnetic memory devices that require specific coercivity, remanent magnetization, and squareness ratio. Additionally, the composites exhibit a high magnetocaloric effect with constant magnetic entropy changes, making them suitable for wide temperature range magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Shantanu Kumar Panda, Sambit Kumar Biswal, Jyotirekha Mallick, Subhadeep Datta, Manoranjan Kar
Summary: In this study, the reversibility of the magnetocaloric effect (MCE) in magnetic materials with reversible magnetocaloric effect across their respective first-order magnetostructural transitions (MST) is investigated. The width of the nucleation energy barrier across the MST is found to determine the reversibility of the MCE. A (Mn0.45Fe0.55)(Ni-0.6 Co-0.4)Si alloy exhibits a large reversible isothermal magnetic entropy change (Delta SM) of -14.4 J kg(-1) K-1 under a low magnetic field change, making it a promising candidate for efficient magnetic refrigeration applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Manisha Srivastava, Gajendra S. Bisht, Ananthakrishnan Srinivasan
Summary: Co2FeGa nanoparticles with stable L21 type full Heusler alloy structure were synthesized via a simple template-less chemical route, exhibiting soft ferromagnetic properties with high saturation magnetization, low coercive field, and high Curie temperature. The nanoparticles showed superparamagnetic nature with near zero coercive field and remanence magnetization. Ab initio calculations were conducted to assess the magnetic moment and half metallic nature of the Heusler alloy particles based on the density of states of spin-up and spin-down bands. (c) 2023 Elsevier B.V. All rights reserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Mukesh Shekhar, Lagen Kumar Pradhan, Lawrence Kumar, Pawan Kumar
Summary: A study on Ca and Ti co-doped bismuth ferrite samples synthesized by the modified sol-gel method is conducted. The crystal structures of the samples are confirmed using x-ray diffraction. The microscopic dielectric relaxations and conduction processes in these materials are analyzed using complex impedance, complex electric modulus, and frequency-dependent ac conductivity analyses. The dispersion behavior of the dielectric constant is studied using the modified Debye's function, while the dielectric characteristics of each sample are described using the brick-layer model. Additionally, the conduction mechanism is investigated using Jonscher's power law and the Arrhenius equation, with the relaxation time and activation energies calculated using the imaginary part of the electrical impedance and the modulus. The presence of non-Debye-type relaxation processes is supported by the electric modulus spectroscopy.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Mukesh Shekhar, Sonu Rani, Rabichandra Pandey, Lawrence Kumar, Manoranjan Kar, Pawan Kumar
Summary: Bi0.85La0.15FeO3, a modified form of bismuth ferrite (BFO) with Lanthanum (La), has a pure crystal structure that enhances the multiferroic properties of BFO. By optimizing the composition with Mn substitution, the magnetization of Bi0.85La0.15FeO3 is effectively increased. Polycrystalline samples of Bi0.85La0.15Fe1-xMnxO3 were synthesized using a tartaric acid modified sol-gel technique, and the effects of Mn substitution on crystal structure, magnetic properties, and optical properties were investigated.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Condensed Matter
Jyotirekha Mallick, Ajay Kumar, Tupan Das, Lagen Kumar Pradhan, Prakash Parida, Manoranjan Kar
Summary: Study on the correlation between crystal structure and physical properties of BSTO (Ba1-xSr(x)TiO3) reveals that the crystal symmetry transition plays a crucial role in varying the physical properties, such as the reduction of band gap and the increase of photocurrent, making it suitable for device applications. This research deepens the understanding of BSTO and provides design parameters for constructing a ferroelectric system with better photosensitive properties.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Tupan Das, Saima Noor, Suman Kumari, Jyotirekha Mallick, Anant Shukla, Subhadeep Datta, Murli Kumar Manglam, Manoranjan Kar
Summary: The Al-doped cobalt ferrite nanofiber was prepared by electrospinning technique and characterized by XRD and TEM. The magnetic properties were investigated using M-H hysteresis loops analysis and "Law of Approach to Saturation" technique. The results showed that the saturation magnetization and coercivity decreased with the increase in Al concentration. The Al-doped cobalt ferrite nanofiber exhibited a squeezing effect on the M-H loop and soft magnetic nature.
Article
Physics, Condensed Matter
Anant Shukla, Jyotirekha Mallick, Suman Kumari, Murli Kumar Manglam, Piyali Biswas, Manoranjan Kar
Summary: The composites (x)CoFe2O4-(1-x)Ba0.8Sr0.2TiO3 were prepared using microwave double-step sintering method and their microstructure, elemental composition, and morphology were investigated using electron microscopy techniques. The dielectric properties of the composites were measured in a wide frequency and temperature range. The results showed that composites with x=0.1 and x=0.2 exhibited better dielectric properties compared to the parent Ba0.8Sr0.2TiO3 and CoFe2O4 phases. Composite with 10% cobalt ferrite showed the highest saturation polarization, remanent polarization, and coercive field.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Murli Kumar Manglam, Sushree Nibedita Rout, Anant Shukla, Jyotirekha Mallick, Subhadeep Datta, Manoranjan Kar
Summary: The thin film of BaFe12O19 (BHF) on a silicon substrate was prepared by pulse laser deposition, and its crystal structure, morphology, elemental analysis, and magnetic properties were investigated. X-Ray Diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy, elemental dispersive x-ray analysis, and vibrating sample magnetometry were used in the study. The results showed peak shifting in XRD pattern and Raman spectra for the thin film compared to the powder sample, possibly due to stress at the film-substrate interface. The magnetic properties of the thin film and powder were different, with the thin film exhibiting a magnetic frustration effect.
Article
Materials Science, Biomaterials
Nitu, Rushikesh Fopase, Lalit Mohan Pandey, Papori Seal, Jyoti Prasad Borah, Ananthakrishnan Srinivasan
Summary: Magnetic bioactive glass-ceramic (MGC) powders were synthesized by substituting silicon dioxide with iron oxide in Hench's 45S5 glass composition. The composition of the MGC powders affected the crystalline phases, suspension stability, magnetization, heat generation capacity, bioactivity, and cell viability. MGC with 10 wt% iron oxide showed optimal properties, surpassing FluidMag-CT used for hyperthermia treatment.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
Article
Chemistry, Physical
Sanjeet Kumar Paswan, Pawan Kumar, Suman Kumari, Subhadeep Datta, Manoranjan Kar, J. P. Borah, Lawrence Kumar
Summary: This study investigates the structural, optical, temperature-dependent magnetic, and electrical properties of nanocrystalline NiFe1.97RE0.03O4 (RE = La3+ and Sm3+) compound. The results show that rare earth ion substitution leads to a decrease in lattice constant and particle size. The optical and magnetic properties of rare earth substituted samples are different from pure nickel ferrite, while their electrical properties exhibit similar behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Subhadeep Datta, Shubham Shatrughna Dheke, Shantanu Kumar Panda, Sushree Nibedita Rout, Tupan Das, Manoranjan Kar
Summary: This study analyzes the magnetocaloric effect of different compositions of Nickel-Manganese-Gallium-based Heusler alloys and finds that they exhibit large magnetocaloric effects and a wide range of working temperatures, thereby enhancing magnetic cooling performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
