scholarly journals To question about Fe5B3 boride formation in boron-rich Fe–В alloys

2020 ◽  
Vol 28 (2) ◽  
pp. 79-82
Author(s):  
O. V. Sukhova
Keyword(s):  
Solid Solutions ◽  
Heat Production ◽  
Polymorphic Transformation ◽  
Eutectoid Reaction ◽  
Electron Microscopic ◽  
X Ray ◽  
Scanning Electron Microscopic ◽  
Primary Crystals ◽  
Scanning Electron ◽  
Microscopic Energy

The structure of boron-rich iron alloys in the concentration range of 9.0–15.0 wt. % В, 0.01–0.17 wt. % C, Fe – the balance (with charge impurities of Si, Al, Mn) was investigated in this work. The methods of metallographic, X-ray, stop-quenching, scanning electron microscopic, energy dispersive, and fluorescent spectral analyses were applied. The FeB- and Fe2B-based solid solutions are proved to be the major constituents of the investigated alloys. No evidence is found for the possible formation of the Fe5B3 boride via peritectic reaction L+FeB→Fe5B3 at 1650 K and its further decomposition via eutectoid reaction Fe5B3→FeB+Fe2B at 1410 K. It is shown that the phase under consideration is iron hemiboride alloyed mainly by silicon which peritectically forms from primary crystals of iron monoboride and the rest of liquid at 1650 K. The thermal effect at 1410 K is assumed to be caused by a heat production connected with polymorphic transformation α-FeB→β-FeB in the presence of carbon.

scholarly journals PELATIHAN PENGGUNAAN PERALATAN LABORATORIUM FISIKA MATERIAL DAN RISET BAGI GURU-GURU FISIKA SMA SE KOTA MANADO

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
Donny R Wenas
Keyword(s):  
Fourier Transform ◽  
Ultra Violet ◽  
Energy Dispersive ◽  
Electron Microscopic ◽  
X Ray ◽  
Infra Red ◽  
Scanning Electron Microscopic ◽  
Scanning Electron ◽  
Microscopic Energy

Kemampuan melaksanakan kegiatan praktikum/demonstrasi dan mengembangkan materi pembelajaran berbasis laboratorium adalah salah satu kompetensi guru fisika. Peningkatan kemampuan tersebut akan meningkatkan daya saing lulusan siswa. Tujuan pelaksanaan kegiatan pengabdian pada masyarakat ini adalah: 1) memperkenalkan pengetahuan tentang laboratorium Fisika material dan Riset bagi guru Fisika SMA se kota Manado; 2) memberikan pelatihan keterampilan penggunaan peralatan laboratorium Fisika material dan riset bagi guru Fisika SMA se kota Manado; 3) menjelaskan manfaat karakterisasi peralatan laboratorium Fisika Material dan Riset bagi guru Fisika SMA se kota Manado; dan 4) menjalin kerja sama antara dunia kerja yaitu Sekolah dengan Perguruan Tinggi (UNIMA) agar tercipta keserasian tentang kebutuhan Sumber Daya Manusia dilapangan dan kurikulum yang diterapkan khususnya pada Program Studi Fisika FMIPA UNIMA. Metode yang dilakukan adalah ceramah, demonstrasi, peragaan, diskusi dan evaluasi. Kegiatan ini akan menghasilkan produk berupa buku panduan bagaimana dan apa yang harus dilakukan dalam mengoperasikan peralatan laboratorium fisika material dan riset. Buku panduan akan dirancang semenarik mungkin disertai gambar dan keterangan serta langkah-langkah dalam mengoperasikan alat laboratorium. Disamping buku panduan, akan dibuat juga buku ajar tentang konsep dan teori terkait dengan peralatan laboratorium fisika material dan riset serta artikel ilmiah. Berdasarkan kegiatan yang dilaksanakan, maka diperoleh hasil sebagai berikut: 1) para peserta (Guru fisika SMA) mengenal pengetahuan tentang spektroskopi UV-Vis (Ultra Violet Visible); 2) memahami pengetahuan tentang spektroskopi FTIR (Fourier Transform Infra red); 3) mengenal pengetahuan tentang SEM-EDX (Scanning Electron Microscopic-Energy Dispersive X-Ray Spectrometric); dan 4) mampu mengoperasikan alat spektrometer UV-Vis, FTIR, dan SEM-EDX.

scholarly journals Preparation of Reswellable Amorphous Porous Celluloses through Hydrogelation from Ionic Liquid Solutions

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3249 ◽  
Author(s):  
Satoshi Idenoue ◽  
Yoshitaka Oga ◽  
Daichi Hashimoto ◽  
Kazuya Yamamoto ◽  
Jun-ichi Kadokawa
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquid ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Liquid Solutions ◽  
Scanning Electron Microscopic ◽  
Porous Morphology ◽  
Scanning Electron

In this study, we have performed the preparation of reswellable amorphous porous celluloses through regeneration from hydrogels. The cellulose hydrogels were first prepared from solutions with an ionic liquid, 1-butyl-3-methylimidazolium chloride (BMIMCl), in different concentrations. Lyophilization of the hydrogels efficiently produced the regenerated celluloses. The powder X-ray diffraction and scanning electron microscopic measurements of the products suggest an amorphous structure and porous morphology, respectively. Furthermore, the pore sizes of the regenerated celluloses, or in turn, the network sizes of cellulose chains in the hydrogels, were dependent on the concentrations of the initially prepared solutions with BMIMCl, which also affected the tensile mechanical properties. It was suggested that the dissolution states of the cellulose chains in the solutions were different, in accordance with the concentrations, which representatively dominated the pore and network sizes of the above materials. When the porous celluloses were immersed in water, reswelling was observed to regenerate the hydrogels.

scholarly journals Influence of the type of electrolyte on the morphological and crystallographic characteristics of lead powder particles

2013 ◽  
Vol 78 (9) ◽  
pp. 1387-1395 ◽  
Author(s):  
Nebojsa Nikolic ◽  
Vesna Maksimovic ◽  
Goran Brankovic ◽  
Predrag Zivkovic ◽  
Miomir Pavlovic
Keyword(s):  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Lead Powder ◽  
Scanning Electron Microscopic ◽  
Crystallographic Characteristics ◽  
Powder Particles ◽  
Primary Type ◽  
Secondary Type ◽  
Scanning Electron

Lead electrodeposition processes from the basic (nitrate) and complex (acetate) electrolytes were mutually compared by the scanning electron microscopic and the X-ray diffraction analysis of the produced powder particles. The shape of dendritic particles strongly depended on the type of electrolyte. The dendrites composed of stalk and weakly developed primary branches (the primary type) were predominantly formed from the basic electrolyte. The ramified dendrites composed of stalk and of both primary and secondary branches (the secondary type) were mainly formed from the complex electrolyte. In the both type of powder particles Pb crystallites were predominantly oriented in the (111) plane. Formation of powder particles of the different shape with the strong (111) preferred orientation was discussed and explained by the consideration of the general characteristics of the growth of a crystal in the electrocrystallization processes.

Scanning Electron Microscopic (SEM) Studies on the Effect of X-Ray Contrast Media on Aortic Endothelium in the Rat

1983 ◽  
Vol 18 (4) ◽  
pp. 382-386 ◽  
Author(s):  
CHRISTIAN GOSPOS ◽  
HERBERT KURT KOCH ◽  
K. MATHIAS ◽  
W. SEEMANN ◽  
K. G. TAN ◽  
...  
Keyword(s):  
Contrast Media ◽  
Electron Microscopic ◽  
X Ray ◽  
Aortic Endothelium ◽  
Scanning Electron Microscopic ◽  
Scanning Electron ◽  
Sem Studies
Sign in / Sign up

Export Citation Format

Share Document