scholarly journals Synthesis and characterization of AlMgB14 hot pressed under different environments

2017 ◽  
Vol 49 (3) ◽  
pp. 311-317 ◽  
Author(s):  
Zhou Yumei ◽  
Zhang Fenglin ◽  
Pengcheng Li ◽  
Bai Kun ◽  
Shanghua Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Scanning Electron Microscopy ◽  
Single Phase ◽  
Synthesis And Characterization ◽  
Carbon Powder ◽  
X Ray ◽  
Spinel Mgal2o4 ◽  
Scanning Electron

AlMgB14 hot pressed under different environments from the elemental powders was investigated. The microstructure of the products was analyzed by scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX) and X-ray diffractometer (XRD). The density, hardness and fracture toughness of AlMgB14 were also examined. The results show that single phase of MgAl2O4 is formed in hot pressed Al-Mg-B system in air. The addition of carbon powder cannot reduce the formation of MgAl2O4. Additional Al (10 wt.%) and Mg (10 wt.%) can effectively compensate for their loss in the formation of MgAl2O4 and enhance the production of AlMgB14 under agron atmosphere. The AlMgB14 with 10 vol.% spinel MgAl2O4 owns a hardness of 28.42 GPa and a fracture toughness of 2.92 MPa?m1/2.

Hydrothermal Synthesis and Characterization of BiFeO3 Polyhedral Crystallites

2012 ◽  
Vol 174-177 ◽  
pp. 508-511
Author(s):  
Lin Lin Yang ◽  
Yong Gang Wang ◽  
Yu Jiang Wang ◽  
Xiao Feng Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

BiFeO3 polyhedrons had been successfully synthesized via a hydrothermal method. The as-prepared products were characterized by power X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The possible mechanisms for the formation of BiFeO3 polyhedrons were discussed. Though comparison experiments, it was found that the kind of precursor played a key role on the morphology control of BiFeO3 crystals.

Darstellung und Charakterisierung des Silber(I,II,III)-oxidclathrates Ag7O8HCO3 / Synthesis and Characterization of the Silver(I,II,III) Oxide Clathrate Ag7O8HCO3

2000 ◽  
Vol 55 (9) ◽  
pp. 882-886 ◽  
Author(s):  
Martin Jansen ◽  
Sascha Vensky
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Magnetic Susceptibility ◽  
Solid State Nmr ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The silver(I,II,III) oxide clathrate Ag7O8HCO3 was synthesized by anodic oxidation of silver(I) in a suspension of Ag2CO3 in an aqueous AgF solution. The title compound was characterized by single crystal X-ray diffraction (cubic, Fm3̄m, a = 9.8085(3) Å, Z = 4), scanning electron microscopy, thermal analysis, IR spectroscopy, 1H-solid state-NMR and measurement of the magnetic susceptibility

scholarly journals Sintesis Senyawa Aurivillius Ca1-xBi3,5+xLa0,5Ti4-xMnxO15: Struktur dan Sifat Dielektrik

2018 ◽  
Vol 14 (1) ◽  
pp. 143
Author(s):  
Zulhadjri Zulhadjri ◽  
Rini Ramadhani ◽  
Aulia Arivin Billah ◽  
Syukri Arief ◽  
Emriadi Emriadi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Single Phase ◽  
Double Exchange ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Aurivillius Phase ◽  
X Ray ◽  
Scanning Electron

<p>Sintesis senyawa feroelektrik yang berbasis fasa Aurivillius berlapis empat (n = 4) yang didadah kation La<sup>3+</sup> dan Mn<sup>3+</sup>, Ca<sub>1-x</sub>Bi<sub>3,5+x</sub>La<sub>0,5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub> dengan <em>x</em> = 0, 0,2, 0,4, 0,6, 0,8, dan1 telah dilakukan dengan teknik lelehan garam. Karakterisasi produk dengan difraksi sinar-X (XRD) menunjukkan bahwa fasa tunggal Aurivillius ditunjukkan oleh sampel dengan <em>x</em> = 0, 0,2, 0,4, dan 0,6. <em>Refinement</em> struktur dengan teknik <em>Le Bail</em> diketahui bahwa senyawa Aurivillius yang terbentuk sesuai dengan simetri ortorombik dan grup ruang <em>A2<sub>1</sub>am</em>. Analisis dengan <em>Scanning Electron Microscopy </em>(SEM) untuk semua sampel memperlihatkan morfologi sampel berupa lempengan yang merupakan ciri khas senyawa Aurivillius. Nilai konstanta dielektrik sampel dan konduktivitasnya mengalami kenaikan dengan meningkatnya <em>x</em>. Konduktivitas paling tinggi dimiliki oleh sampel <em>x</em> = 0,2 yang diperkirakan akibat adanya interaksi pertukaran ganda (<em>double exchange</em>) antara Mn<sup>3+</sup> dan Mn<sup>4+</sup>.</p><p><strong>Synthesis of Aurivillius Compounds Ca<sub>1-x</sub>Bi<sub>3,5 + x</sub>La<sub>0,5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub>: Structure and Dielectric Properties</strong><strong>. </strong>Synthesis of ferroelectric compounds based on a four-phase Aurivillius phase (n = 4) which is doped with La<sup>3+</sup> and Mn<sup>3+</sup> cations, Ca<sub>1-x</sub>Bi<sub>3,5+x</sub>La<sub>0,5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub> with <em>x</em> = 0, 0.2, 0.4, 0.6, 0 , 8, and 1 were carried out by molten salts technique. Characterization of products using X-ray diffraction (XRD) revealed that the single phase Aurivillius was shown by the samples with <em>x</em> = 0, 0,2, 0,4, and 0,6. The results of refinement show that the Aurivillius phase formed has orthorhombic symmetry with <em>A2<sub>1</sub>am</em> space group. Morphology analysis by scanning electron microscopy (SEM) for all samples shows the plate-like as the characteristic of Aurivillius compounds. The value of dielectric constant and conductivity of the samples increases as increase of x. The conductivity of <em>x</em> = 0.2 is the highest predicted due to the interaction of double exchange between Mn<sup>3+</sup> and Mn<sup>4+</sup>.<strong> </strong><strong></strong></p>

Synthesis and Characterization of NiO Doped SnO2 Nano-Flowers

2013 ◽  
Vol 575-576 ◽  
pp. 58-60
Author(s):  
Wei Ping Tang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectrum ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Scanning Electron

In this present work, a new method for preparing NiO doped SnO2 nanoflowers by hydrothermal route is suggested. The composition and microstructure of samples were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and Fourier transform infrared spectrum (FTIR). Moreover, a possible formation mechanism was discussed.

scholarly journals Hydrothermal synthesis and characterization of polycrystalline gadolinium aluminum perovskite (GdAlO3, GAP)

2015 ◽  
Vol 33 (2) ◽  
pp. 301-305 ◽  
Author(s):  
Girish H. N. ◽  
Basavalingu B. ◽  
Shao G.-Q. ◽  
Sajan C. P. ◽  
S. K. Verma
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Infrared Spectroscopy ◽  
High Temperature ◽  
Synthesis And Characterization ◽  
Energy Dispersive Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

AbstractGadolinium aluminum perovskite (GdAlO3, GAP) is a promising high temperature ceramic material, known for its wide applications in phosphors. Polycrystalline gadolinium aluminum perovskites were synthesized using a precursor of co-precipitate gel of GdAlO3 by employing hydrothermal supercritical fluid technique under pressure and temperature ranging from 150 to 200 MPa and 600 to 700 °C, respectively. The resulted products of GAP were studied using the characterization techniques, such as powder X-ray diffraction analysis (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM) and energy dispersive analysis of X-ray (EDX). The X-ray diffraction pattern matched well with the reported orthorhombic GAP pattern (JCPDS-46-0395).

scholarly journals Synthesis and Characterization of (Ca,Sr)[C2O4]∙nH2O Solid Solutions: Variations of Phase Composition, Crystal Morphologies and in Ionic Substitutions

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 654 ◽  
Author(s):  
Aleksei V. Rusakov ◽  
Mariya A. Kuzmina ◽  
Alina R. Izatulina ◽  
Olga V. Frank-Kamenetskaya
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
Solid Solutions ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcium Oxalates ◽  
Scanning Electron

To study strontium (Sr) incorporation into calcium oxalates (weddellite and whewellite), calcium-strontium oxalate solid solutions (Ca,Sr)[C2O4]∙nH2O (n = 1, 2) are synthesized and studied by a complex of methods: powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. Two series of solid solutions, isomorphous (Ca,Sr)[C2O4]·(2.5 − x)H2O) (space group I4/m) and isodimorphous Ca[C2O4]·H2O(sp.gr. P21/c)–Sr[C2O4]·H2O(sp.gr. P 1 - ), are experimentally detected. The morphogenetic regularities of their crystallization are revealed. The factors controlling this process are discussed.

Synthesis and Characterization of Mixed Rare Earths Hydroxide Catalyst

2018 ◽  
Vol 936 ◽  
pp. 53-57
Author(s):  
Bheechanat Duangdee ◽  
Dussadee Rattanaphra ◽  
Anusith Thanapimmetha ◽  
Maythee Saisriyoot ◽  
Penjit Srinophakun
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Rare Earth ◽  
Rare Earths ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
Scanning Electron

This work presents the synthesis and characterization of mixed rare earths hydroxide heterogeneous catalyst. The catalysts were prepared by co-precipitation of mixed rare earths with NaOH at different pH (6, 7 and 12). The prepared catalysts were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM–EDS). The XRF results showed that the catalyst composed of cerium (Ce), neodymium (Nd), lanthanum (La), praseodymium (Pr) and samarium (Sm) being predominant at pH up to 7. Particularly, cerium (Ce) was favorable precipitation at pH 7. This results were confirm by SEM-EDS. The Ce (OH)3 phase was clearly observed for the mixed rare earth catalyst precipitated at pH 7. The XRF, SEM-EDS and XRD results were consistency.

scholarly journals Sintesis Senyawa Aurivillius Ca1-xBi3,5+xLa0,5Ti4-xMnxO15: Struktur dan Sifat Dielektrik

2018 ◽  
Vol 14 (1) ◽  
pp. 160
Author(s):  
Zulhadjri Zulhadjri ◽  
Rini Ramadhani ◽  
Aulia Arivin Billah ◽  
Syukri Arief ◽  
Emriadi Emriadi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Single Phase ◽  
Double Exchange ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Aurivillius Phase ◽  
X Ray ◽  
Scanning Electron

<p>Sintesis senyawa feroelektrik yang berbasis fasa Aurivillius berlapis empat (n = 4) yang didadah kation La<sup>3+</sup> dan Mn<sup>3+</sup>, Ca<sub>1-x</sub>Bi<sub>3,5+x</sub>La<sub>0,5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub> dengan <em>x</em> = 0, 0,2, 0,4, 0,6, 0,8, dan1 telah dilakukan dengan teknik lelehan garam. Karakterisasi produk dengan difraksi sinar-X (XRD) menunjukkan bahwa fasa tunggal Aurivillius ditunjukkan oleh sampel dengan <em>x</em> = 0, 0,2, 0,4, dan 0,6. <em>Refinement</em> struktur dengan teknik <em>Le Bail</em> diketahui bahwa senyawa Aurivillius yang terbentuk sesuai dengan simetri ortorombik dan grup ruang <em>A2<sub>1</sub>am</em>. Analisis dengan <em>Scanning Electron Microscopy </em>(SEM) untuk semua sampel memperlihatkan morfologi sampel berupa lempengan yang merupakan ciri khas senyawa Aurivillius. Nilai konstanta dielektrik sampel dan konduktivitasnya mengalami kenaikan dengan meningkatnya <em>x</em>. Konduktivitas paling tinggi dimiliki oleh sampel <em>x</em> = 0,2 yang diperkirakan akibat adanya interaksi pertukaran ganda (<em>double exchange</em>) antara Mn<sup>3+</sup> dan Mn<sup>4+</sup>.</p><p><strong>Synthesis of Aurivillius Compounds Ca<sub>1-x</sub>Bi<sub>3,5 + x</sub>La<sub>0,5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub>: Structure and Dielectric Properties</strong><strong>. </strong>Synthesis of ferroelectric compounds based on a four-phase Aurivillius phase (n = 4) which is doped with La<sup>3+</sup> and Mn<sup>3+</sup> cations, Ca<sub>1-x</sub>Bi<sub>3,5+x</sub>La<sub>0,5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub> with <em>x</em> = 0, 0.2, 0.4, 0.6, 0 , 8, and 1 were carried out by molten salts technique. Characterization of products using X-ray diffraction (XRD) revealed that the single phase Aurivillius was shown by the samples with <em>x</em> = 0, 0,2, 0,4, and 0,6. The results of refinement show that the Aurivillius phase formed has orthorhombic symmetry with <em>A2<sub>1</sub>am</em> space group. Morphology analysis by scanning electron microscopy (SEM) for all samples shows the plate-like as the characteristic of Aurivillius compounds. The value of dielectric constant and conductivity of the samples increases as increase of x. The conductivity of <em>x</em> = 0.2 is the highest predicted due to the interaction of double exchange between Mn<sup>3+</sup> and Mn<sup>4+</sup>.<strong> </strong><strong></strong></p>

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