Magnetochemistry
·
2023
·Vol. 9
·期 7
·181
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IF 2.7
Xiaogang Yu,Renpeng Yang,Chengwei Wu,Bo Liu,Wei Zhang
Zn0.6Mg0.4CrxFe2−xO4(0 ≤ x ≤ 0.4) nanoparticles were synthesized using a hydrothermal technique. The obtained magnetic nanoparticles (MNPs) exhibited a spinel structure, where the lattice constant decreased with the Cr3+ion content. The doping of Cr3+ion (x = 0.1) increased the specific saturation magnetization to 46.4 emu/g but decreased to 20.0 emu/g with the further increase in the Cr3+ion content to x = 0.4. The decrement in Curie temperature was ascribed to the weakened super-exchange interaction between the metal ions located atA-sites andB-sites, which arose from the doping of the Cr3+ion. The T2-weighted images gradually darkened with the increase in Zn0.6Mg0.4Cr0.1Fe1.9O4nanoparticles concentration, suggesting that the nanoparticles can enhance the image contrast. Zn0.6Mg0.4CrxFe2−xO4(0 ≤ x ≤ 0.4) nanoparticles were able to heat the agar phantom to the hyperthermia temperature under the safe alternating magnetic field, which showed their potential in the magnetic induction hyperthermia.Keywords:magnetic nanoparticles;Curie temperature;hyperthermia
研究领域:
材料科学
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医学影像
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生物医学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 20
·1-15
·
IF 2.8
Xie Zhuojia,Jiang Xinyu,Zhang Weijian,Zou Zhengguang
With the development of the current times, the demand for refrigeration is in every aspect. Nevertheless, the necessity for new refrigeration materials is immediate because of the greenhouse effect and the destruction of the atmosphere. Therefore, perovskite materials have been investigated. La 0.8− x Eu x Ca 0.1 Sr 0.1 MnO 3 (LECSMO) ( x = 0.05, 0.10, 0.15) powder samples were prepared using the sol–gel method (S–G). The structure, magnetocaloric effect, and magnetic of LECSMO have been explored. X-ray diffraction (XRD) indicates that all samples belong to the rhombohedral perovskite structure of the Pbnm space group. The magnetic research of LECSMO revealed that the samples doped with Eu 3+ exhibited a ferromagnetic (FM) to paramagnetic (PM) transition around the Curie temperature (Tc). As the amount of Eu 3+ doping is added, Tc decreased from 264 to 194 K. Normalization and Banerjee’s criterion confirmed the second-order phase transition of the LECSMO near Tc. The maximum magnetic entropy change ( \(-\varDelta {S}_{M}^{max}\) ) for LECSMO ( x = 0.05, 0.10, 0.15) is 5.39, 4.52, and 4.35 J/(kg·K) when the applied magnetic field (H) = 5 T, respectively. Further, the relative cooling power (RCP) of LECSMO is 282.20 J·kg − 1 , 305.20 J·kg − 1 , and 323.15 J·kg − 1 , respectively.
研究领域:
材料科学
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物理学
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DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Xinliang Ge,Huan Li,Hui Zheng,Peng Zheng,Liang Zheng,Yang Zhang
Ferrite with high permeability, high magnetic loss, and a low Curie temperature is a highly promising material for hyperthermia applications in cancer treatment. In this work, Ni(0.29–x)MgxCu0.14Zn0.60Fe1.94O3.94 (NiMgCuZn) ferrites were prepared at different Mg ion concentrations. The dependence of the Mg ion contents on the crystal structure, magnetic, and permeability properties of NiMgCuZn ferrite was investigated. Structural characterization showed a high crystallinity of the materials and an increase in the lattice constant with the Mg ion content. The magnetic hysteresis loops revealed that the saturation magnetization decreased with an increasing Mg content. Furthermore, the permeability measurements showed an increase in permeability and magnetic loss with the doping of Mg. More importantly, the Curie temperature of the NiMgCuZn ferrite decreases with the Mg ion content and reaches 42.37 °C for x = 0.26 as well as a real permeability of ∼797.88@1 MHz and a magnetic loss of 0.316@1 MHz, which meet the requirements of tumor hyperthermia.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Bowei Xun,Aizhen Song,Jingru Yu,Yang Yin,Jing-Feng Li,Bo-Ping Zhang
BiFeO3-BaTiO3 is a promising high-temperature piezoelectric ceramic that possesses both good electromechanical properties and a Curie temperature (TC). Here, the piezoelectric charge constants (d33) and strain coefficients (d*33) of (1 – x)BiFeO3-xBaTiO3 (BF-xBT; 0.20 ≤ x ≤ 0.50) lead-free piezoelectrics were investigated at room temperature. The results showed a maximum d33 of 225 pC/N in the BF-0.30BT ceramic and a maximum d*33 of 405 pm/V in the BF-0.35BT ceramic, with TCs of 503 and 415 °C, respectively. To better understand the performance enhancement mechanisms, a phase diagram was established using the results of XRD, piezoresponse force microscopy, TEM, and electrical property measurements. The superb d33 of the BF-0.30BT ceramic arose because of its location in the optimum point in the morphotropic phase boundary, low oxygen vacancy (VO··) concentration, and domain heterogeneity. The superior d*33 of the BF-0.35BT ceramic was attributed to a weak relaxor behavior between coexisting macrodomains and polar nanoregions. The presented strategy provides guidelines for designing high-temperature BF-BT ceramics for different applications.
研究领域:
材料科学
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物理学
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DOI
PubMed
高影响因子
ACTA MATERIALIA
·
2022
·
IF 9.209
Shengdong Sun,Ye Liu,Yueyun Zhang,Lu Wang,Chuanrui Huo,Shiqing Deng,Hui Liu,Yang Ren,Jie Wu,He Qi,Jun Chen
Owing to the mutual restriction between piezoelectric coefficient ( d 33 ) and Curie temperature ( T c ), the discovery of high-temperature piezoceramics with large d 33 is highly desirable but challenging. Here, BiFeO 3 -BaTiO 3 -PbTiO 3 (BF-BT-PT) ternary system is redesigned by combining the low lattice distortion of BF-BT perovskites and rhombohedral-tetragonal coexistence of BF-PT phase boundary. As a result, excellent comprehensive piezoelectric properties with a large d 33 of ∼380 pC/N and a high T c of ∼483 °C are obtained in a tetragonal composition close to the triple point. Interestingly, even though a c / a ratio as large as 1.04 can be detected in the virgin sample, hierarchical domains that macrodomains composed of nanosized stripe domains can be found. The tetragonal phase could partly transform into a monoclinic phase under electric field according to in-situ high-energy synchrotron X-ray diffraction measurement , constructing a field-induced morphotropic phase boundary. The large lattice distortion and unstable phase structure simultaneously contribute to the high T c, and large d 33 for the studied BF-BT-PT ceramics, respectively, showing great potential for high-temperature sensors and transducers.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 33
·24986-24994
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IF 2.779
Cheng Li-Qian,Jiang Guozheng,Ma Zhenhua,Xu Ze,Yu Minghao,Lu Jingtong,Chen Kai
Al-doped BaZr 0.2 Ti 0.8 O 3 (BZT20) ceramics were prepared by solid-state sintering, and the relaxation degree of phase transition was tailored effectively. The microstructure, dielectric properties, ferroelectric properties, and electrocaloric (EC) performance of Al 2 O 3 -doped BZT20 ceramics were studied, respectively. The results show that Al 2 O 3 doping induces changes in Curie temperature and dielectric properties. When the additive amount of Al 2 O 3 is 1.25 at.%, the Curie temperature drops to around room temperature (RT), and the dielectric loss is lower than that of pure BZT20 ceramics. The diffusion constant γ reaches a minimum value of 1.57 when the Al 2 O 3 content is 1.25 at.%, indicating that a relatively large latent heat would be gathered while there is a phase transition. As a result, an enhanced EC response of ∆ T max = 0.293 K near RT is obtained when the Al 2 O 3 content is 1.25 at.%, which is 1.6 times that of pure BZT20. It is also impressive that a wide working temperature range can be obtained, that is, T span = 73 K for BZT20 ceramics with 1 at.% of Al 3+ ionic content.
研究领域:
材料科学
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物理学
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DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
J. Wu,N. Qin,E.Z. Lin,Z.H. Kang,D.H. Bao
Nanocrystalline Ba 1- x Sr x TiO 3 ( x = 0–0.3) powders were investigated with special interest in their piezocatalytic performance for degradation of organic pollutants. A great improvement of piezocatalytic activity was obtained for the compositions x = 0.2, in which the polarization shows a large change under external stress. Furthermore, with the increase of working environment temperature, the piezocatalytic performance of Ba 0.8 Sr 0.2 TiO 3 increases firstly and then decreases, giving the best piezocatalytic performance near its Curie temperature . For a better understanding of the piezocatalytic mechanism, the dynamics of charge carriers transfer on solid/liquid interface was discussed with respect to activation energy and overpotential of catalyst. It was suggested that the enhanced piezocatalytic activity of Ba 1- x Sr x TiO 3 comes from two aspects: (1) the overpotential provided by the piezoelectric effect decreases with the increasing Sr content, (2) the activation energy for the piezocatalytic reaction is greatly reduced at ferro-paraelectric phase transition. Combination of these two aspects gives rise to the nonlinear dependence of piezocatalytic activity on Sr content.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Advanced Dielectrics
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2018
·
IF 0
Jiang Li,Dan-Dan Li,Biao Lu,Ying-Bang Yao,Tao Tao,Bo Liang,Wen-Hui Lu,Ge-Li Luo,Sheng-Guo Lu
The electrocaloric effect (ECE) in lead-free BaSn x Ti 1 − x O 3 (BSnT, x = 0 . 0 5 , 0.10 and 0.15) ceramics were investigated using a direct ECE measurement. Results indicate that the maximum ECE occurs near the Curie temperature and it slightly shifts towards high temperatures. The directly measured ECE is larger than that calculated using the Maxwell relation and P-E loops. A maximum electrocaloric efficiency Δ T ∕ Δ E = 0 . 4 9 × 1 0 − 6 KmV − 1 was procured for the composition with x = 0 . 1 5 at T = 2 9 9 . 2 K. And it also shows a broad peak in the temperature range of 250–320 K.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Feifei Zhang,Wei Shi,Shangyi Guan,Yugen Xu,Heng Yang,Hao Chen,Jie Xing,Hong Liu,Qiang Chen
Bi 4 Ti 3 O 12 (BIT), a typical layered-structure ferroelectric with a high Curie temperature ( T C ), is a promising material for high-temperature sensors. Herein, W/Cr co-substitution at the B-site of BIT ceramics (BITWC100 x ) is carried out to investigate the phase structure, domain structure, and electrical properties. The W/Cr addition apparently reduces the concentration of oxygen vacancies , effectively improving the ferroelectric and piezoelectric properties as well as the resistivity of the BIT ceramics. The BITWC2 ceramic exhibits a high piezoelectric coefficient ( d 33 = 31.1 pC/N), a moderate T C (651 °C), a large remnant polarization ( P r = 12.2 μC cm −1 ), and a prominent direct current resistivity (5.49 ×10 6 Ω·cm at 500 °C). Moreover, the BITWC2 ceramic possesses a large d 33 of 26.6 pC/N at an annealing temperature of 600 °C, indicating the excellent thermal stability of the piezoelectric coefficient. Overall, the BITWC100 x ceramics can be used in piezoelectric devices at temperatures up to 500 °C.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
SCRIPTA MATERIALIA
·
2021
·
IF 5.611
Lei Meng,Chu Xin Peng,Chen He,Fei Yen
The polarity of the magnetic susceptibility χ( T ) of ammonium alum NH 4 Al(SO 4 ) 2 •12H 2 O single crystals below its ferroelectric Curie temperature T C is identified to depend only on the cooling rate. To explain this, we consider reorienting distorted NH 4 + to carry weak magnetic and electric dipole moments that are linearly coupled. Slow cooling allows the dipole moments to align which enhances χ( T ) to become positive. However, due to energy degeneracy of rotational motion and geometric frustration of the NH 4 + , faster cooling rates render the system to become an orientational glass state causing χ( T ) to remain negative. Specific heat measurements also show the presence of excess entropy below a negative anomaly near 53 K. Our findings identify a possible new class of non-equilibrium system with potential applications in non-volatile memory devices.
研究领域:
物理学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2025
·
IF 4.7
Meng-si WANG,Yan ZHANG,Xiao-gang LUO,Lin TANG,Shan XIANG,Ru GUO,Xue-fan ZHOU,Ke-chao ZHOU,Dou ZHANG
MnO 2 -doped Ca 0.97 Bi 2.03 Nb 2 O 9 ceramics with greatly improved piezoelectric performance were prepared via conventional solid state sintering method. The effects of MnO 2 doping on the microstructure and electrical properties of Ca 0.97 Bi 2.03 Nb 2 O 9 ceramics were studied. X-ray diffraction (XRD) analysis and Rietveld refinement revealed a reduction in orthorhombicity with MnO 2 doping, which contributed to the enhancement of the piezoelectric properties. Furthermore, the introduction of MnO 2 lowered the sintering temperature, thereby reducing the formation of oxygen vacancies in the ceramic. The optimal performance was achieved in the Ca 0.97 Bi 2.03 Nb 2 O 9 −0.3wt.%MnO 2 sample, exhibiting a piezoelectric coefficient ( d 33 ) of 13.6 pC/N, a DC resistivity of 3×10 6 Ω·cm at 500 °C, and a Curie temperature of 965 °C. Additionally, all doped samples demonstrated excellent thermal stability over a wide temperature range, from room temperature to 900 °C.
研究领域:
材料科学
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固态物理
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产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 8
·1-13
·
IF 2.5
Xie Zhuojia,Xu Changji,Jiang Xinyu,Zhang Weijian,Feng Min,Zhong Shenglin,Zou Zhengguang
With the growing attention to perovskite materials in the field of magnetic refrigeration. In this work, La 0.8−x Pr x Sr 0.2 MnO 3 (x = 0.05, 0.10, 0.15) (LPSMO) samples were synthesized through the sol–gel method. The effects of Pr 3 ⁺ doping on the structure, morphology, and magnetization of LPSMO were investigated. The XRD analysis revealed that the LPSMO samples have a rhombohedral structure within the R-3c space group. As the amount of Pr 3 ⁺ doping increased, the cell volume decreased. The magnetic properties of LPSMO exhibited a transition from ferromagnetic (FM) to paramagnetic (PM) near the Curie temperature (Tc), with Tc decreasing as the Pr 3 ⁺ doping level increased. The second-order magnetic phase transition of LPSMO near Tc was confirmed by employing the MPMS. The maximum magnetic entropy change ( \(-\Delta {S}_{M}^{max}\) ) of LPSMO is 4.92 J/(kg·K) (x = 0.05), 5.13 J/(kg·K) (x = 0.10) and 5.04 J/(kg·K) (x = 0.15) when the external magnetic field (H) = 5 T, separately. Meanwhile, the relative cooling power ( RCP ) of LPSMO are 283.88, 276.71, and 289.60 J·kg −1 , respectively. The experiments indicate that LPSMO has promising application prospects.
研究领域:
材料科学
·
磁制冷技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）