Applied Physics A最新文献

{"title":"Molecular dynamics study on the atomic configuration evolution and suppression of shear bands for Zr-based metallic glass during cutting processing","authors":"Yin Liu,&nbsp;Cuiping Li,&nbsp;Fei Pan,&nbsp;Xingwei Sun,&nbsp;Haosheng Dong,&nbsp;Weifeng Zhang,&nbsp;Hongxun Zhao,&nbsp;Shibo Mu,&nbsp;Zhenshan Luo,&nbsp;Zewei Yuan","doi":"10.1007/s00339-025-08429-7","DOIUrl":"10.1007/s00339-025-08429-7","url":null,"abstract":"<div><p>In this paper, molecular dynamics simulation method is used to reveal the deformation mechanism of amorphous alloy cutting by adding suppression tool. The results show that, in the metal glass cutting model added with suppression tool, the suppression tool can significantly inhibit the expansion of shear zone. Through changing the spacing between suppression tool and tool, the suppression of metallic glass shear zone was observed. The results show that the spacing between suppression tool and tool had little influence on the shape of cutting force curve. The smaller the spacing between suppression tool and tool, the more stable the short-range ordered structure and medium-range ordered structure of metallic glass, the more stable the amorphous phase number, the less the atomic migration, and the less prone to shear zone. In addition, when the cutting speed is high, the time required for the cutting tool to reach the same distance decreases, the cutting force changes significantly, the amorphous structure of the metal glass increases, the atomic bond energy breaks, the strain rate in the shear region increases, and the plastic deformation capacity is greater. Therefore, reducing the cutting speed can effectively inhibit the expansion of shear transformation zone and the formation of shear zone.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143668117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetocaloric effect and critical behavior of Nd1-3xBaxCaxSrxMnO₃ (0.066 ≤ x ≤ 0.11) manganites: optimization of doping for enhanced refrigerant performance","authors":"Naima Mtiraoui,&nbsp;Houda Kaouach,&nbsp;Abdessalem Dhahri","doi":"10.1007/s00339-025-08394-1","DOIUrl":"10.1007/s00339-025-08394-1","url":null,"abstract":"<div><p>This study investigates the magnetic and magnetocaloric properties of Nd_1-3xBa_xCa_xSr_xMnO₃ (<span>(0.066 le x le 0.11)</span>) manganites through experimental analysis and numerical simulations. Using the Arrott–Noakes equation and the Landau model, critical exponents (<i>γ</i><i>, </i><i>β</i>) were determined to be (1; 0.43), (1.06; 0.39), and (1; 0.88) for Nd_1-3xBa_xCa_xSr_xMnO₃ with x = 0.066, 0.1, and 0.11, respectively, via the Modified Arrott Plot and Kouvel–Fisher method, revealing deviations from conventional universality classes. Numerical simulations of magnetization behavior showed strong agreement with experimental data. Magnetocaloric effect (MCE) analysis demonstrated an enhanced magnetic entropy change (<span>(- Delta S_{M})</span>) with increasing Ba, Ca, and Sr doping, leading to improved refrigeration efficiency, particularly at x = 0.1. The present samples exhibit considerable maximum magnetic entropy change of <span>(left| {Delta S_{M}^{max} } right|)</span> of 5.24, 4.15 and 2.65 J·kg⁻¹·K⁻¹ with Temperature-Averaged Entropy Change <i>TEC</i> (3 K) of 4.77, 4.06 and 2.61 J·kg⁻¹·K⁻¹ under 5 T magnetic field for Nd_1-3xBa_xCa_xSr_xMnO₃ with x = 0.066, 0.1 and 0.11, respectively. These findings provide insights into optimizing doping strategies for enhanced magnetocaloric performance in manganite-based refrigerants.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-025-08394-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser ablation as a tool for fragmentation of active pharmaceutical ingredient particles: overview","authors":"Béla Hopp,&nbsp;Tamás Gera,&nbsp;Eszter Nagy,&nbsp;Judit Kopniczky,&nbsp;Zsolt Homik,&nbsp;Tamás Smausz,&nbsp;János Bohus,&nbsp;Tibor Ajtai,&nbsp;Piroska Szabó‑Révész,&nbsp;Motzwickler-Németh Anett,&nbsp;Rita Ambrus","doi":"10.1007/s00339-025-08378-1","DOIUrl":"10.1007/s00339-025-08378-1","url":null,"abstract":"<div><p>Poor water solubility affects approximately 40% of marketed drugs and 90% of those in development, limiting bioavailability and posing challenges for the pharmaceutical industry. Reducing particle size enhances solubility and bioavailability by increasing the active surface area, which accelerates dissolution and absorption. However, obtaining particles below a few micrometers remains difficult with conventional methods. Pulsed laser ablation (PLA) provides a promising approach for producing micro- and nanosized particles from bulk materials by tailoring laser parameters and experimental conditions. In this study, we used PLA in ambient air and laser ablation in distilled water (PLAL) to significantly reduce the particle size of poorly soluble non-steroidal anti-inflammatory drugs (NSAIDs), including ibuprofen, niflumic acid, and meloxicam. Lasers with varying wavelengths and pulse lengths were applied to ablate tablets made from commercially available powders. FTIR and Raman spectroscopy confirmed that the chemical composition of the particles remained consistent with the original active ingredients. The laser-shredded particles showed improved solubility and superior anti-inflammatory effects compared to the reference powders. Fast photographic imaging further revealed details of the material removal process during laser irradiation. These findings highlight the potential of laser ablation as an innovative method for enhancing poorly soluble pharmaceuticals.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-025-08378-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143668266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Ni2+ incorporation into the lanthanum manganite lattice: fine-tuning of magnetic ordering for spintronic applications","authors":"G. Sheeba Sharon,&nbsp;M. Kumaresavanji,&nbsp;M. Baneto,&nbsp;K. Ravichandran,&nbsp;K. Sofiya,&nbsp;Shamima Hussain,&nbsp;A. T. Ravichandran","doi":"10.1007/s00339-025-08417-x","DOIUrl":"10.1007/s00339-025-08417-x","url":null,"abstract":"<div><p>The ABO₃ type materials (perovskites) have garnered significant attention in the field of spintronics owing to their tunable magnetic properties. The focus of this study is to prepare nanoparticles of LaMn_1-yNi_yO₃ (y = 0, 0.2, 0.4, 0.6 and 0.8) and tune their magnetic properties by varying nickel doping concentration. The material was prepared via solution combustion synthesis (SCS) and its structural, morphological, elemental, compositional and thermal properties were investigated and correlated with the magnetic properties. The range of the crystallite size calculated using Scherrer formula is from 52 to 57 nm and the range of the particle size measured from morphological study is from 77 to 111 nm. From the magnetic studies, it is found that with increasing Ni doping, the Curie temperature (Tc) increases from 143 to 246 K (y = 0 to 0.4) before decreasing to 142 K (y = 0.8). The samples with lower Ni content (y = 0 and 0.2) displayed higher saturation magnetization (Ms) and remanent magnetization (Mr) values. Their higher coercivity (Hc) made them less ideal for spintronics applications. In contrast, samples with lower Hc (y = 0.6 and 0.8) showed reduced Ms and Mr, which could affect their overall performance. Notably, the sample with y = 0.4, exhibiting Ms of 53.27 emu/g, Mr of 12.32 emu/g, and Hc of 0.024 T, offers a good balance, making it a better candidate for spintronics applications. This study highlights the impact of Ni substitution at the Mn-site on the magnetic properties of LaMnO₃ nanoparticles, offering insights into their potential use in spintronics applications.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Bi2O3 as sintering aid on the microstructure and electrical properties of La2Ti2O7 ceramics","authors":"Ravina Swami,&nbsp;A. K. Shukla,&nbsp;K. Sreenivas,&nbsp;S. Deepa,&nbsp;P. Lavanya Rathi,&nbsp;P. Senthil Kumar","doi":"10.1007/s00339-025-08355-8","DOIUrl":"10.1007/s00339-025-08355-8","url":null,"abstract":"<div><p>Bismuth oxide (Bi₂O₃) as a liquid-phase sintering agent is examined for the preparation of La_2-<i>x</i>Bi_<i>x</i>Ti₂O₇ ceramics. Bi₂O₃ volatilisation restricts the sintering temperature to 1300 °C, and increasing Bi content (<i>x</i> = 0–0.1) facilitates increasing the average grain size (~ 1–15 μm) in sintered ceramics. However, higher Bi content (<i>x</i> = 0.15 &amp; 0.25) leads to excessive Bi₂O₃ segregation at grain boundaries. Phase analysis by X-ray diffraction reveals presence of single phase La₂Ti₂O₇ along with residual phases consisting of (anatase-TiO₂, rutile-TiO₂ and α-Bi₂O₃) to a varying extent with increasing Bi content. Raman spectroscopy reveals the incorporation of Bi³⁺ at La³⁺ sites in La₂Ti₂O₇, and the in-phase and symmetric stretching vibrational modes of La–O are affected with Bi incorporation. Composition analysis by EDS (energy dispersive spectrometry) reveals (1) partial entry of Bi into the lattice, and (2) increasing loss of Bi due to volatilisation which have been further confirmed through simultaneous heat flow and mass loss measurements. Increasing Bi content enhances the dielectric constant (εʹ) from 60 to 82 and reduces the dielectric loss (tan δ ~ 10^–4). Grain, grain boundary and electrode effects are analysed, and Cole–Cole impedance analysis explains the purely capacitive nature of the ceramics with high electrical resistivity (<span>({rho }_{DC})</span>~ 10¹³ Ω-cm). Simultaneous heat-flow and thermogravimetric measurements indicate the ferroelectric phase transition at ~ 780 °C, and ferroelectric to paraelectric phase transition at ~ 1250 °C, and improved piezoelectric coefficient (<i>d</i>_<i>33</i> = 2.1 pC/N) is seen for an optimum Bi content (<i>x</i> = 0.075) in La_2-<i>x</i>Bi_<i>x</i>Ti₂O₇ in comparison to the low <i>d</i>_<i>33</i> value (1.4 pC/N) for undoped La₂Ti₂O₇.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143668161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exact solution of the coupled thermo–viscoelastic problem for the semi-infinite space","authors":"Markus Wenin","doi":"10.1007/s00339-025-08422-0","DOIUrl":"10.1007/s00339-025-08422-0","url":null,"abstract":"<div><p>We present an exact analytical solution of the periodic time-dependent thermo-viscoelastic problem for the infinite half space with traction-less surface and a volume heat source arising from laser penetration. We take into account the extension of the heat source, the mutual dependence of heat transfer and elasticity and the viscosity of the material, to describe damping of elastic waves, and in particular surface waves for periodic driving. The solution of the heat equation (including temperature change caused by compression/dilatation of the material) is also provided and a numerical example for aluminium, where this is demonstrated, is given.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure design and performance optimization of GaAs based betavoltaic microbattery using solid-state tritium source","authors":"Shiping Wei,&nbsp;Yuan Hu","doi":"10.1007/s00339-025-08400-6","DOIUrl":"10.1007/s00339-025-08400-6","url":null,"abstract":"<div><p>Betavoltaic microbatteries have shown a great promising potential in military and commercial applications due to their attractive characteristics of easy integration, long lifetime and superior adaptability. However, improvement of both energy conversion efficiency and output power has been a big challenge. In this paper, we proposed a GaAs based betavoltaic microbattery using solid-state tritium source. The influences of structural parameters of solid-state tritium source and GaAs semiconductor transducer, the self-absorption and surface recombination effects and doping concentrations on the output performance of the betavoltaic microbattery were analyzed by the Monte Carlo simulation and Matlab code. The electrical performance of the betavoltaic microbattery was evaluated and optimized. The simulation results showed that under an illumination of 0.2 Ci titanium tritide (TiT₂) film, the betavoltaic microbattery displayed a maximum output power of 39.8 nW and energy conversion efficiency of 0.58% with an open-circuit voltage of 0.62 V, a short-circuit current of 76.9 nA, and a high filling factor of 0.83. It is noted that the thickness of solid-state tritium source and reverse saturation current of GaAs semiconductor transducer have important influences on output performance and should be reasonably reduced.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly sensitive strain sensors with minimal hysteresis using laser-induced graphene","authors":"Sadegh Sadeghzadeh","doi":"10.1007/s00339-025-08408-y","DOIUrl":"10.1007/s00339-025-08408-y","url":null,"abstract":"<div><p>This study optimises the fabrication of piezoresistive strain sensors using direct laser writing to minimise hysteresis. Fine-tuning the fabrication process created highly sensitive, linear, and repeatable sensors. The most sensitive sensor, fabricated with 32% laser power and 325 pulses per inch, achieved a gauge factor of approximately 100. This is significantly higher than commercially available metal foil strain gauges, which typically have gauge factors ranging from 2 to 5. The resistance of these sensors can be adjusted across a broad range, from tens of ohms to several kilohms. This sensor element exhibits remarkable sensitivity, demonstrated by a greater than 4500% increase in resistance during each loading cycle at 40% strain. This substantial resistance change is a powerful signal amplifier, enhancing the signal-to-noise ratio and enabling operation across a wider strain range. The sensor's performance is optimised through laser machining, with electrical resistance inversely related to laser power. Notably, sensors fabricated with varying machining parameters consistently display excellent linearity, reaching up to 99.9% in some cases by adjusting the laser power between 36 and 40%. Ultimately, the optimised sensors achieve near-perfect linearity (0.999) across a 0–40% strain range (and beyond), coupled with a high gauge factor (approximately 100) and an exceptionally low limit of detection (0.027%). This combination ensures both high sensitivity and precision, providing a reliable tool for strain-sensing applications.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic and magneto-caloric behavior of La0.67-xEuxBa0.33Mn0.85Fe0.15O3 (x = 0.0 and 0.1) nanoparticles","authors":"A. Ben Jazia Kharrat,&nbsp;W. Boujelben,&nbsp;N. Chniba-Boudjada","doi":"10.1007/s00339-025-08382-5","DOIUrl":"10.1007/s00339-025-08382-5","url":null,"abstract":"<div><p>The magnetic and magneto-caloric (MC) behavior of La_0.67-xEu_xBa_0.33Mn_0.85Fe_0.15O₃ (x = 0.0 and 0.1) nanoparticles has been investigated in this work. The samples under study were prepared using the sol–gel method. Structural analysis, conducted via X-ray diffraction, revealed that the samples crystallize in an orthorhombic structure with a <i>Pbnm</i> space group. The magnetic data indicate that the compounds exhibit a transition from a ferromagnetic (FM) to a paramagnetic (PM) state as the temperature increases. The Curie temperature values are 170 K and 100 K for x = 0 and 0.1, respectively. At low temperatures and for all samples, the M(µ₀H) curves at various temperatures show the coexistence of antiferromagnetic domains. The Griffiths phase, identified from the temperature dependence of the inverse susceptibility, is observed in these samples. The magneto-caloric (MC) effect was determined from the magnetization versus applied magnetic field up to 7 T at different temperatures (5 K ≤ T <span>(le)</span> 280 K). A broadening of the magnetic entropy change peak and low values of (-ΔS_Max) are highlighted in our samples. For magnetic field µ₀H = 5 T, (-ΔS_Max) reaches maximum values in the order of 0.90 and 0.59 J.K⁻¹.kg¹ for x = 0 and 0.1 respectively. Despite the low values of (-ΔS_Max), important values of the relative cooling power have been observed in our compounds which are 182.81 and 92.72 (JK⁻¹) for x = 0 and 0.1 respectively for µ₀H = 5 T.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of non-bridging oxygen formation and structural evolution in SrO-doped borosilicate glasses","authors":"H. M. Zahran,&nbsp;A. M. Abdelghany,&nbsp;Y. M. Moustafa,&nbsp;Meawad M. ElKholy,&nbsp;G. El-Damrawi","doi":"10.1007/s00339-025-08341-0","DOIUrl":"10.1007/s00339-025-08341-0","url":null,"abstract":"<div><p>This study investigates the structural modifications and crystallization behavior of glasses in the system xSrO–(40 − x)SiO₂–30CaO–30B₂O₃ (x = 0, 10, 20, 30, 35 mol%). The amorphous nature of as-prepared glasses was confirmed through X-ray diffraction analysis. Upon thermal treatment, controlled crystallization led to the formation of apatite, wollastonite, and strontium silicate crystalline phases, as evidenced by XRD and TEM analyses. The progressive substitution of SrO for SiO₂ resulted in increased concentration of non-bridging oxygen atoms (NBO) in both silicate (SiO₄) and borate (BO₄) structural units, as revealed by FTIR and NMR spectroscopy. The presence of NBOs promoted crystallization processes and facilitated the formation of nano-crystalline species. The formation of biocompatible crystalline phases, particularly wollastonite (CaSiO₃) and apatite (CaSrBO₄), suggests potential applications in orthodontic and orthopedic fields.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-025-08341-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}