Physica B-condensed Matter最新文献

Magnetic structure and colossal dielectric properties in Ga3+ substituted Zn2Y hexaferrites by chemical co-precipitation method 化学共沉淀法制备的 Ga3+ 取代 Zn2Y 六铁氧体的磁结构和巨大介电性能

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-16 DOI: 10.1016/j.physb.2024.416635

{"title":"Magnetic structure and colossal dielectric properties in Ga3+ substituted Zn2Y hexaferrites by chemical co-precipitation method","authors":"","doi":"10.1016/j.physb.2024.416635","DOIUrl":"10.1016/j.physb.2024.416635","url":null,"abstract":"<div><div>Y-type Ba0.5Sr1.5Zn2Fe12-xGaxO22 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) hexaferrites are prepared through modified chemical co-precipitation method. X-ray diffraction (XRD) results reveal that these samples are single-phase and the space group is <math><mrow><mi>R</mi><mover><mn>3</mn><mo>‾</mo></mover><mi>m</mi></mrow></math>. The field-emission scanning electronic microscope (FE-SEM) measurements indicate that the grains are hexagonal-plate with a diameter of 2–5 μm. In the M-T diagrams, various magnetic structures are modulated, including proper-screw, longitudinal conical (LC), mixed conical (MC), and collinear ferrimagnetic (collinear FIM). In this series of samples, the values of dielectric constant (<math><mrow><msup><mi>ε</mi><mo>′</mo></msup></mrow></math>) achieve an order increase from 102 to 104. For the best x = 0.8 sample, the <math><mrow><msup><mi>ε</mi><mo>′</mo></msup></mrow></math> is as high as 1804.76 at 1 MHz and 300 K. In conclusion, Ba0.5Sr1.5Zn2Fe12-xGaxO22 with controllable magnetic structures and colossal dielectric constant are potential materials for miniaturization of modern electronic devices.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of magneto-optoelectronics properties of Mg1-xMnxS alloys for optoelectronics and spintronic applications 用于光电子学和自旋电子学应用的 Mg1-xMnxS 合金的磁光特性研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-15 DOI: 10.1016/j.physb.2024.416629

引用次数: 0

Persistence luminescence and thermoluminescence of 260 nm UVC irradiated mixed-phase (BaAl2O4 - BaAl12O19) barium aluminate 经 260 纳米紫外线照射的混相（BaAl2O4 - BaAl12O19）铝酸钡的持久发光和热致发光

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-13 DOI: 10.1016/j.physb.2024.416628

引用次数: 0

Synthesis, characterization, electrochemical impedance spectroscopy performance and photodegradation of methylene blue: Mesoporous PEG/TiO2 by sol-gel electrospinning 亚甲基蓝的合成、表征、电化学阻抗谱性能和光降解：溶胶-凝胶电纺丝法制备介孔 PEG/TiO2

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-13 DOI: 10.1016/j.physb.2024.416627

{"title":"Synthesis, characterization, electrochemical impedance spectroscopy performance and photodegradation of methylene blue: Mesoporous PEG/TiO2 by sol-gel electrospinning","authors":"","doi":"10.1016/j.physb.2024.416627","DOIUrl":"10.1016/j.physb.2024.416627","url":null,"abstract":"<div><div>Sol-gel and electrospinning methods successfully prepared porous TiO2 fibers. The samples were calcined at temperatures of 450 °C and 550 °C and characterized using different techniques. XRD analysis also revealed crystalline anatase and rutile phases of mp-TiO2 observed at calcining temperatures of 450 °C and 550 °C, whereas as-prepared showed an amorphous-like structure. Relatively higher surface area and photocatalytic efficiency were increased with a decrease in crystallite size. All samples absorb UV region. The Rs value of TiO2 calcined at 550 °C was 16.6 Ω, which is much lower than those of the 450 °C calcined TiO2 powder electrode (52.7 Ω) and as-prepared TiO2 electrode (95.3 Ω). In addition, the Rp resistance of TiO2 calcined at 550 °C electrode (5.85 kΩ) was also lower than those of 450 °C calcined TiO2 powder (39.0 kΩ) and as-prepared TiO2 electrode (68.9 kΩ), revealing better electronic and ionic conduction of TiO2 calcined at 550 °C electrode.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural, morphological and optical properties of the La2W2O9/Fe2O3 composite for UV-shielding applications 用于紫外线屏蔽应用的 La2W2O9/Fe2O3 复合材料的结构、形态和光学特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-12 DOI: 10.1016/j.physb.2024.416618

{"title":"Structural, morphological and optical properties of the La2W2O9/Fe2O3 composite for UV-shielding applications","authors":"","doi":"10.1016/j.physb.2024.416618","DOIUrl":"10.1016/j.physb.2024.416618","url":null,"abstract":"<div><div>Currently, research has been conducted on the individual oxides La2W2O9 and Fe2O3 but not on its composite form. Using a solid-state reaction technique, a La2W2O9/Fe2O3 composite was created. A particular calcination cycle was followed by mixing the raw precursors. Scanning electron microscopy (SEM) was used to investigate the morphological microstructure, and X-ray diffraction (XRD) was used to examine the structural characteristics. The thermal and gravimetric properties were examined via differential thermal analysis (DTA) and thermogravimetric analysis (TGA). The optical characteristics were investigated via UV–visible spectroscopy, which investigated included the transmittance, absorbance, absorption coefficient, band gap (Eg), penetration depth (β), Urbach energy (EU), refractive index, optical conductivity, and dielectric function. These findings indicate that the optical properties improved after the addition of Fe2O3 compared with those of pure La2W2O9. The La2W2O9/Fe2O3 composite holds promise as a prospective material for use in the fields of sunscreen products, UV shielding or solar filtration.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142442319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photoluminescence properties of SnO2 nanoparticles doped with group VI elements (Cr, Mo, W) synthesized by pulsed laser ablation in liquid 在液体中通过脉冲激光烧蚀合成的掺杂 VI 族元素（铬、钼、钨）的 SnO2 纳米粒子的光致发光特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-12 DOI: 10.1016/j.physb.2024.416625

{"title":"Photoluminescence properties of SnO2 nanoparticles doped with group VI elements (Cr, Mo, W) synthesized by pulsed laser ablation in liquid","authors":"","doi":"10.1016/j.physb.2024.416625","DOIUrl":"10.1016/j.physb.2024.416625","url":null,"abstract":"<div><div>Tin oxide nanoparticles (SnO2 NPs), both pure and doped with Group VI (G6) metal ions (Cr+3, Mo+5, and W+6), were synthesized using pulsed laser ablation in liquid. This study aimed to investigate the effect of G6 doping on the electronic properties of SnO2 NPs, with an emphasis on enhancing their photoluminescence for optoelectronic applications. Transmission electron microscopy revealed well-crystallized samples with diameters of 3–6 nm, indicating quantum-confinement effects. The optical band gap, determined by UV–Vis spectroscopy, was reduced from 5.1 eV (undoped) to 4.9 eV (Cr-doped) due to defect states, while increasing to 5.3 eV and 5.7 eV for Mo- and W-doped SnO2, respectively, due to the Moss-Burstein effect. The photoluminescence spectra exhibited a redshift, with strong red emission around 700 nm, which was up to 90 % more intense than that of the undoped SnO2. This enhancement was attributed to the 2E→4A2 transition and increased defect states.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gradient distribution of cations in rhabdophane La0.27Y0.73PO4·nH2O nanoparticles 阳离子在La0.27Y0.73PO4-nH2O纳米颗粒中的梯度分布

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-12 DOI: 10.1016/j.physb.2024.416623

引用次数: 0

Investigation of rare earth metal ions (Sm and Er) doped CoMoO4 polymorphs for photocatalytic dye degradation 掺杂稀土金属离子（Sm 和 Er）的 CoMoO4 多晶体光催化染料降解研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-11 DOI: 10.1016/j.physb.2024.416616

引用次数: 0

Anisotropic magnetic entropy change and magnetic critical behavior in van der Waals Fe3GaTe2 范德华Fe3GaTe2中各向异性的磁熵变化和磁临界行为

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-11 DOI: 10.1016/j.physb.2024.416615

{"title":"Anisotropic magnetic entropy change and magnetic critical behavior in van der Waals Fe3GaTe2","authors":"","doi":"10.1016/j.physb.2024.416615","DOIUrl":"10.1016/j.physb.2024.416615","url":null,"abstract":"<div><div>Fe3GaTe2, with intrinsic magnetism at ambient temperature and high perpendicular magnetic anisotropy, is a promising van der Waals material for 2D-materials-based spintronic devices. Herein, we report the anisotropic magnetocaloric effects and magnetic critical phenomena in Fe3GaTe2 single crystal. Owing to the large anisotropy, magnetic entropy change <math><mrow><mo>(</mo><mrow><mo>−</mo><mo>Δ</mo><msub><mi>S</mi><mi>M</mi></msub></mrow><mo>)</mo></mrow></math> shows anisotropic character with <math><mrow><mo>−</mo><mo>Δ</mo><msubsup><mi>S</mi><mi>M</mi><mi>max</mi></msubsup></mrow></math> of 1.67 J kg−1 K−1 along the c axis and 1.11 J kg−1 K−1 in the ab plane under field change of 5 T. The rotating <math><mrow><mo>Δ</mo><msub><mi>S</mi><mi>M</mi></msub></mrow></math> from the ab plane to the c axis reaches 0.67 J kg−1 K−1 at magnetic field of 5 T. By carefully fitting the <math><mrow><mo>−</mo><mo>Δ</mo><msubsup><mi>S</mi><mi>M</mi><mi>max</mi></msubsup></mrow></math> and relative cooling power (RCP), we determine their relationships to be <math><mrow><mo>−</mo><mo>Δ</mo><msubsup><mi>S</mi><mi>M</mi><mi>max</mi></msubsup><mo>∝</mo><msup><mi>H</mi><mi>n</mi></msup></mrow></math> (n = 0.694(1)) and <math><mrow><mi>R</mi><mi>C</mi><mi>P</mi><mo>∝</mo><msup><mi>H</mi><mi>m</mi></msup></mrow></math> (m = 1.301(3)) for the magnetic field along the c-axis. Further analysis of critical behavior near TC reveals critical exponents β = 0.41(1) at TC = 341.5(1) K, γ = 1.01(1) at TC = 341.6(3) K, and δ = 3.67(15) at TC = 340 K, indicating a three-dimensional complex magnetic exchange.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142442317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CBD-synthesized Mg-doped CdS thin films for hybrid solar cells and self-powered photodetectors 用于混合太阳能电池和自供电光电探测器的 CBD 合成掺镁 CdS 薄膜

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-11 DOI: 10.1016/j.physb.2024.416622

引用次数: 0