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Thermal Behavior and Magnetic Properties of Nd-Fe-B Based Exchange Spring Nanocomposites Nd4-xTbxFe83.5Co5Cu0.5Nb1B6(x = 0, 0.2, 0.4, 0.6, 0.8 and 1) Melt-Spun Ribbons

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Advances in Materials Physics and Chemistry 2017年第6期7卷 223-241页

作者： palash chandra karmaker Mohammad Obaidur Rahman Nguyen Huy Dan Samia Islam Liba Per Nordblad Dilip Kumar Saha Sheikh Manjura Hoque Materials Science Division Atomic Energy CenterDhakaBangladesh Department of Physics Jahangirnagar UniversityDhakaBangladesh Institute of Materials Science Vietnam Academy of Science and TechnologyHanoiVietnam Solid State Physics Department of Engineering ScienceUppsala UniversityUppsalaSweden

Co-rich Nd-Fe-B nanocomposite ribbons with Tb substituted have been fabricated by single roller melt spinning technique of Nd4-xTbxFe83.5Co5Cu0.5Nb1B6 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) alloys in an argon (Ar) atmosphere at a circumferential speed of 40 m/s. According to the differential scanning calorimeter (DSC) traces the nanocomposite samples have been annealed at different temperatures like 675°C, 687°C, 700°C, 712°C and 725°C for 10 min. Crystallization behavior was studied by X-ray diffraction in which it was found that the XRD patterns are characterized by broad diffused pattern which demonstrate the amorphous state of materials. The ribbon samples were also characterized by vibration sample magnetometer (VSM) and Mössbauer spectroscopy at as-cast and annealed condition. Co-rich and Tb substitution has significantly enhanced the value of coercivity (Hc) and maximum energy product (BH)max. Highest value of Hc and (BH)max has been obtained as 2.36 kOe and 6.11 MGOe for the sample annealed at 700°C for 10 min with higher concentration of Tb. The M-H hysteresis loops show extremely soft natures which do not possess any area. We have found reduced remanent ratio (Mr/Ms) up to 0.49 at optimal annealing temperature 700°C. However, with the annealing of the samples in the above mentioned temperature, evolution of large coercivity was observed due to the formation of exchange couple hard and soft nanocrystal composites. We have investigated the variation of Curie temperature (Tc) with annealing temperature of the melt spun ribbon samples. Mossbauer spectroscopy was carried out to study the hyperfine parameters such as hyperfine field, hyperfine field distribution for full width half maximum (FWHM) and isomer shift of Fe species of these two phases.

关键词： Coercivity Maximum Energy Product Remanent Ratio Nanocomposite Hard and Soft Phases

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NERD1 is required for primexine formation and plasma membrane undulation during microsporogenesis in Arabidopsis thaliana

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aBIOTECH 2020年第4期1卷 205-218页

作者： Dawei Xu palash chandra Mondol Sumie Ishiguro Jianxin Shi Dabing Zhang Wanqi Liang Joint International Research Laboratory of Metabolic&Developmental Sciences State Key Laboratory of Hybrid RiceSchool of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China Graduate School of Bioagricultural Sciences Nagoya UniversityNagoya 464-8601Japan School of Agriculture Food and WineUniversity of AdelaideAdelaideSA 5064Australia Systems Biotechnology Kyung Hee UniversityYongin 446-701South Korea

The primexine formation and plasma membrane undulation are the crucial steps of pollen wall formation in many ***,the molecular mechanism underlining these processes is largely *** Arabidopsis,NEW ENHANCER OF ROOT DWARFISM1(NERD1),a transmembrane protein,was reported to play pleiotropic roles in plant development including male fertility control;while,how NERD1 disruption impacts male reproduction is yet ***,we revealed that the male sterility of nerd1 mutants is attributed to defects in early steps of pollen wall *** found that nerd1-2 is void of primexine formation and microspore plasma membrane undulation,defective in callose ***,sporopollenin precursors are unable to deposit and assemble on the microspore surface,but instead accumulated in the anther locule and tapetal cells,and ultimately leading to microspore ***1 is localized in the Golgi and is expressed in both vegetative and reproductive organs,with the highest expression in reproductive tissues,including the tapetum,male meiocytes,tetrads and mature pollen *** results suggest that NERD1 is required for the primexine deposition and microspore plasma membrane undulation,thus essential for sporopollenin assembly and pollen exine formation.

关键词： Primexine Male sterile Sporopollenin Arabidopsis thaliana

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