Volume combustion and mechanochemical syntheses of LaB6

Date

2017-01-01

Author

Akgun, Baris
Sevinc, Naci
ÇAMURLU, HASAN ERDEM
Topkaya, Yavuz Ali

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

47
views

0
downloads

LaB6 powder was produced by volume combustion synthesis (VCS) and mechanochemical synthesis (MCS) methods, through magnesiothermic reduction of La2O3 and B2O3 powders. VCS was achieved by rapid heating of the reactant mixture in argon, whereas MCS was performed via high energy ball milling. All the products were subjected to XRD, SEM, gravimetric and particle size distribution analyses. MCS resulted in the expected products LaB6 and MgO. In addition to these, VCS products contained LaBO3 and Mg3B2O6. In order to obtain pure LaB6, 30 min leach in 1 M HCl was found to be enough for MCS products, whereas Mg3B2O6 could not be removed from the VCS products even after 15 h leach. Wet milling of VCS products before leach facilitated obtaining of pure LaB6. Average particle sizes of the LaB6 powder produced by VCS and MCS were 290 and 180 nm, respectively.

Subject Keywords

Lanthanum Hexaboride, Lab6, Mechanochemical Synthesis, MCS, Volume Combustion Synthesis, Magnesiothermic Reduction

URI

https://hdl.handle.net/11511/48221

Journal

INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY

DOI

https://doi.org/10.1504/ijmpt.2017.10007219

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Dimethyl ether from syngas and effect of CO2 sorption on product distribution over a new bifunctional catalyst pair containing STA@SBA-15 ÇELİK ÖZCAN, MERVE; PEKMEZCİ KARAMAN, BİRCE; OKTAR, NURAY; Doğu, Timur (2022-12-01) Direct synthesis of dimethyl ether (DME) from syngas was investigated in the presence of a bifunctional catalyst pair containing silicotungstic acid (STA) incorporated SBA-15 (5, 10, 25% by wt. STA) for the in-situ dehydration of synthesized methanol. The methanol synthesis component of this catalyst mixture is a Cu/ZnO-based commercial (HF) catalytic material. The new STA@SBA-15 type solid acid catalysts synthesized in this study indicated ordered mesoporous structures with surface area values in the range...
Formation of TiB2 by volume combustion and mechanochemical process Bilgi, Eda; ÇAMURLU, HASAN ERDEM; Akgun, Baris; Topkaya, Yavuz Ali; SEVİNÇ, NACİ (Elsevier BV, 2008-04-01) Titanium diboride was produced both by volume combustion synthesis (VCS) and by mechanochemical synthesis (MCP) through the reaction of TiO2, B2O3 and Mg. VCS products, expected to be composed of TiB2 and MgO, were found to contain also side products such as Mg2TiO4, Mg3B2O6, MgB2 and TiN. HCl leaching was applied to the reaction products with the objective of removing MgO and the side products. Formation of TiN could be prevented by conducting the VCS under an argon atmosphere. Mg2TiO4 did not form when 40...
Synthesis, characterizations and investigation of thermoluminescence properties of strontium pyrophosphate doped with metals Ilkay, L. S.; ÖZBAYOĞLU, GÜLHAN; Yılmaz, Ayşen (2014-11-01) Strontium pyrophosphate, Sr2P2O7, was synthesized by solid-state synthesis method; the product was co-doped with copper-silver (Cu-Ag), copper-indium (Cu-In) and manganese-praseodymium (Mn-Pr) oxides (CuO, MnO, In2O3, Pr6O11 and AgNO3) by solid-state reaction method. The variation of dopant concentrations was investigated from 0.5 to 15% by weight. In addition to these processes, chemical characterizations of samples and the investigation of thermoluminescence (TLD) properties of strontium pyrophosphate wit...
Direct hydrothermal synthesis of palladium-incorporated silicate-structured mesoporous catalysts Sener, Canan; Doğu, Timur; Dogu, Guelsen (2007-01-01) Pd-Si-structured novel mesoporous nanocomposite catalytic materials, having quite high Pd/Si ratios, were synthesized by an acidic direct hydrothermal synthesis route. The nanocomposite catalytic materials were then characterized by XRD, XPS, EDS, nitrogen adsorption, and SEM techniques. Unlike MCM-41, the XRD patterns indicated a rather wide d((100)) band at a 2 theta value of about 1.9. The materials, with very high Pd/Si wt ratios between 1.43 and 2.66, were synthesized and had BJH surface area values be...
Synthesis and characterization of Ba/MCM-41 Kaya, Emine; Oktar, Nuray; Karakaş, Gürkan; Murtezaoglu, Kirali (2010-01-01) Mesoporous Ba/MCM-41 type materials (Ba/MCM-41) with high Ba/Si molar ratios between 0.025 and 0.1 were synthesized by direct hydrothermal synthesis. The samples were characterized by XRD, nitrogen adsorption, TGA-DTA, FTIR, SEM-EDS, and TEM techniques. BET surface areas of samples with various Ba loadings were found between 722 and 931 m(2)/g with 28 A average pore size, which is consistent with the pore size of 30 A for pure MCM-41 samples synthesized by the same procedure. The crystal structures of synth...

Citation Formats

B. Akgun, N. Sevinc, H. E. ÇAMURLU, and Y. A. Topkaya, “Volume combustion and mechanochemical syntheses of LaB6,” INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY, pp. 331–339, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48221.