Synthesis of Magnesium Borates by Mechanically Activated Annealing

Ağaoğulları, Duygu; Balcı, Özge; Gökçe, Hasan; Duman, İsmail; Öveçoğlu, M. Lütfi

doi:10.1007/s11661-012-1109-5

Cited by 17 publications

(7 citation statements)

References 26 publications

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“…Besides, the slope of the enthalpy change-temperature curve for the La 2 O 3 -B 2 O 3 -Mg system arises from the melting of B 2 O 3 at 450 °C, the melting of Mg at 650 °C, the formation of magnesium borate phases in different compositions (MgB 4 O 7 , Mg 2 B 2 O 5 and Mg 3 B 2 O 6 ) at 700-1000 °C and the boiling of Mg at 1095 °C (Ağaoğulları et al, 2012a;2012b). On the basis of the enthalpy changes calculated by thermochemical software in case of using Ca or Mg as a reducing agent, it can be stated that calcium borate phases emerged at about 100 °C lower temperatures than those of magnesium borate phases.…”

Section: Resultsmentioning

confidence: 99%

“…11) and also AAS analysis of the decanted supernatant liquid demonstrate that final LaB 6 powders are sufficiently pure and they do not contain any remnants of residual elements during HCl leaching. Dis- similarly, 3.6 M HCl is enough to remove all undesirable MgO in the milled La 2 O 3 -B 2 O 3 -Mg powders due to the absence of Mg borate phase in the microstructure (Ağaoğulları et al, 2012a).…”

Section: G)mentioning

confidence: 99%

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Preparation of LaB6 Powders via Calciothermic Reduction using Mechanochemistry and Acid Leaching

Ağaoğulları

Balcı

Öveçoğlu

et al. 2016

KONA

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This study reports a room temperature mechanochemical route for the synthesis of LaB 6 powders originated from related metal oxide powders as La 2 O 3 and B 2 O 3 . Ca granules and B 2 O 3 powders were respectively used as reducing agent and boron source in the experiments. This study is actually meaningful to create added value by using the native boron source of Turkey for the production of high-technology boron materials. Milling duration as the most important parameter of mechanochemistry was examined to reveal the ideal production conditions. Mechanochemically synthesized powders were subjected to selective HCl leaching in order to eliminate unwanted phases. Thermochemical software of HSC Chemistry TM program was utilized to determine the reaction probability and to estimate the predicted products. Characterization investigations were carried out by X-ray diffractometer (XRD), differential scanning calorimeter (DSC), particle size analyzer (PSA), stereomicroscope (SM), scanning electron microscope (SEM), transmission electron microscope/energy dispersive spectrometer (TEM/EDS) and atomic absorption spectrometer (AAS). Nanosized LaB 6 powders were achieved with/without an insignificant amount of Ca 3 (BO 3 ) 2 phase via mechanochemistry in a high-energy ball mill for 3 h and via leaching with 4 M and 6 M HCl. Lastly, the experimental outputs obtained by a calciothermic reduction were compared with those of magnesiothermic reduction.

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Section: Resultsmentioning

confidence: 99%

Section: G)mentioning

confidence: 99%

Preparation of LaB6 Powders via Calciothermic Reduction using Mechanochemistry and Acid Leaching

Ağaoğulları

Balcı

Öveçoğlu

et al. 2016

KONA

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“…9(a) and (b) at the end of the annealing processes. It was thought as a probability because Mg/MgO and B 2 O 3 can react and form Mg borates in different compositions between the temperatures of 700 and 1000 °C (Ağaoğulları et al, 2012b). Thus, 1200 °C and 12 h can be respectively evaluated as an optimum annealing temperature and annealing time for yielding ZrB 2 /ZrO 2 ceramic powders with an amount of MgO which will be easily leached out using HCl as well as probable Fe impurity.…”

Section: Annealing Of the Milled Powdersmentioning

confidence: 99%

Microstructural Evaluation of ZrB2/ZrO2 Ceramic Powders Prepared by Milling-Assisted Magnesiothermic Reduction of Oxide Raw Materials

Ağaoğulları

Balcı

Öveçoğlu

et al. 2017

KONA

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This study reports on the synthesis and microstructural evaluation of ZrB 2 /ZrO 2 ceramic powders prepared by milling-assisted magnesiothermic reduction of oxide raw materials. Powder blends containing ZrO 2 , B 2 O 3 and Mg reactants were milled in different type of mills at different durations and were subsequently annealed in a tube furnace under Ar atmosphere. An additional purification step (HCl leaching) was conducted on the milled and annealed samples to obtain only Zr-based products. FactSage TM thermochemical software was used in order toshow a preliminary route for the experiments. The effects of milling duration (up to 100 h), milling type (a SPEX TM 8000D Mixer/Mill and a planetary ball mill), excess Mg amount (5-20 wt.%) and annealing duration (6 and 12 h) on the formation and microstructure of the products were examined. The milled, annealed and leached products were characterized using an X-ray diffractometer (XRD), stereomicroscope (SM), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). Pure ZrB 2 /ZrO 2 ceramic powders having particles in size range of 200 nm-1 μm and containing two different crystal structures of ZrO 2 phase (monoclinic and tetragonal) were obtained after milling in the SPEX TM 8000D Mixer/Mill for 30 h, annealing at 1200 °C for 12 h and leaching with 5 M HCl.

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“…Besides, Mg 2 B 2 O 5 has a great tensile strength (mechanical properties) and excellent thermoluminescent properties. It is a remarkable functional material [2], with excellent anticorrosion and antiwear behavior [3,4]. Mg 2 B 2 O 5 has potential applications as catalysts (for hydrocarbon conversion) and as a wide band gap semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermal Stability and Synergistic Effects of Magnesium and Iron Borate Composites against Pathogenic Bacteria

Ahmad

Khandaker

Khan

et al. 2022

BioMed Research International

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A simple process based on the dual roles of both magnesium oxide (MgO) and iron oxide (FeO) with boron (B) as precursors and catalysts has been developed for the synthesis of borate composites of magnesium and iron (Mg2B2O5-Fe3BO6) at 1200°C. The as-synthesized composites can be a single material with the improved and collective properties of both iron borates (Fe3BO6) and magnesium borates (Mg2B2O5). At higher temperatures, the synthesized Mg2B2O5-Fe3BO6 composite is found thermally more stable than the single borates of both magnesium and iron. Similarly, the synthesized composites are found to prevent the growth of both gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) pathogenic bacteria on all the tested concentrations. Moreover, the inhibitory effect of the synthesized composite increases with an increase in concentration and is more pronounced against S. aureus as compared to E. coli.

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Synthesis of Magnesium Borates by Mechanically Activated Annealing

Cited by 17 publications

References 26 publications

Preparation of LaB<sub>6</sub> Powders via Calciothermic Reduction using Mechanochemistry and Acid Leaching

Preparation of LaB<sub>6</sub> Powders via Calciothermic Reduction using Mechanochemistry and Acid Leaching

Microstructural Evaluation of ZrB<sub>2</sub>/ZrO<sub>2</sub> Ceramic Powders Prepared by Milling-Assisted Magnesiothermic Reduction of Oxide Raw Materials

Enhanced Thermal Stability and Synergistic Effects of Magnesium and Iron Borate Composites against Pathogenic Bacteria

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