Volume 38, Issue 1 (Journal of Advanced Materials-Spring 2019)
2019, 38(1): 65-74 |
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Solgi S, Jafar Tafreshi M, Sasani qhamsari M. Synthesis & Characterization of CaB4O7 Powder by Solid-State Reaction. Journal of Advanced Materials in Engineering (Esteghlal) 2019; 38 (1) :65-74
URL: http://jame.iut.ac.ir/article-1-989-en.html
URL: http://jame.iut.ac.ir/article-1-989-en.html
1. Physics Department, Semnan University, Semnan, Iran. , s.solgi@semnan.ac.ir
Abstract: (5354 Views)
The synthesis of calcium tetraborate was investigated in a temperature ranging from 800℃ to 900℃ using the solid-state reaction method. The synthesis was done using ammonium tetraborate tetrahydrate as the source of boron. At temperatures of 800 ℃ and 880 ℃, the mixed phases from different compounds were formed. At the optimum temperature of 840℃, the mixed phase was only composed of meta and tetraborate phases. A 2wt% excess of ammonium tetraborate tetrahydrate led to the calcium tetraborate phase formation. X-ray diffraction analysis (XRD) confirmed the monoclinic structure at the optimum temperature of 840℃ and by 2wt% excess of ammonium tetraborate tetrahydrate. Formation of BO3 and BO4 units composition and morphology of the prepared sample were studied by Field emission scanning electron microscopy (FE-SEM). The stoichiometry of the prepared powders was almost the same as the theoretical amounts, and powder particles exhibited some monoclinic characteristics.
Keywords: Calcium tetraborate (CaB4O7), Solid-state reaction, Metal- borate, Phase diagram, Anionic groups.
Type of Study: Research |
Subject:
Ceramics and refractory materials
Received: 2018/08/6 | Accepted: 2019/02/26 | Published: 2019/06/15
Received: 2018/08/6 | Accepted: 2019/02/26 | Published: 2019/06/15
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