سنتز و مشخصه‌یابی پودر CaB4O7 تولید شده به‌روش واکنش حالت جامد

نویسندگان

1 1. دانشکده فیزیک، دانشگاه سمنان

2 2. پژوهشکده تحقیقات فناوری‌های فوتونیک و کوانتمی، سازمان انرژی اتمی، تهران

چکیده

در این پژوهش، پودر تترا‌بورات کلسیم (CaB4O7) در بازه دمایی 900-800 درجه سانتی‌گراد به‌روش واکنش حالت جامدسنتز شد. سنتز با استفاده از ماده خوش‌رفتار­تر آمونیوم تترا‌بورات به‌عنوان منبع بور انجام شد. در دماهای 800 و 880 درجه سانتی‌گراد پودری مرکب از فازهای مختلف تشکیل شد. در دمای بهینه 840 درجه سانتی‌گراد، پودری تنها مرکب از فاز­های متا و تترا‌بورات تشکیل شد. افزایش دو درصد وزنی آمونیوم تترا‌بورات نسبت به شرایط استوکیومتری، منجر به تولید محصول تک‌فاز تترا‌بورات کلسیم می­شود. آزمون پراش پرتو ایکس (XRD)، تشکیل ساختار مونوکلینیک را در دمای بهینه 840 درجه سانتی‌گراد و با افزایش دو درصد وزنی عنصر بور، تأیید کرد. تشکیل واحد­های BO3 و BO4 در گروه آنیونی تترا‌بورات کلسیم، توسط طیف‌سنجی مادون قرمز با تبدیل فوریه (FTIR) و رامان (Raman) آزموده شد. ترکیبات عنصری و مورفولوژی ظاهری به‌وسیله میکروسکوپ الکترونی روبشی– گسیل میدانی (FE-SEM) مورد مطالعه قرار گرفت. استوکیومتری پودر تولید شده نزدیک به مقدار تئوری آن به‌دست آمد و ذرات پودر برخی مشخصه­های مونوکلینیک از خود نشان داد.

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis & Characterization of CaB4O7 Powder by Solid-State Reaction

نویسندگان [English]

  • S. Solgi 1
  • M. Jafar Tafreshi 1
  • M. Sasani qhamsari 2
1 1. Physics Department, Semnan University, Semnan, Iran.
2 2. Photonics & Quantum Technologies Research School, NSTRI, Tehran, Iran.
چکیده [English]

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.

کلیدواژه‌ها [English]

  • Calcium tetraborate (CaB4O7)
  • Solid-state reaction
  • Metal- borate
  • Phase diagram
  • Anionic groups

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مواد پیشرفته در مهندسی
دوره 38، شماره 1
خرداد 1398
صفحه 65-74

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