خواص ساختاری، مغناطیسی و حسگری گاز استون توسط هگزافریت باریم- کلسیم تولید شده به‌روش سل- ژل خوداحتراقی

نویسندگان

دانشکده معدن و متالورژی، دانشگاه یزد، یزد، ایران

چکیده

در این مطالعه، نانوذرات پودر هگزافریت باریم- کلسیم با فرمول Ba1-xCaxFe12O19 (1≥x≥0)به‌روش سل- ژل خوداحتراقی تولید شد. پس از کلسینه شدن نمونه‌های ژل خشک شده به‌مدت 4/5 ساعت در دمای 950 درجه سانتی‌گراد، تغییرات فازی و ریزساختاری آنها به‌ترتیب به‌کمک پراش پرتو ایکس (XRD) و میکروسکوپ الکترونی روبشی (SEM)، ارزیابی شد. بنابر نتایج، تشکیل فاز هگزافریت باریم- کلسیم همراه با مقدار جزئی هماتیت به‌عنوان فاز ثانویه تأیید شد. میانگین اندازه‌ ذرات بین 100-60 نانومتر و مورفولوژی ذرات به‌صورت هگزاگو‌نال یا پولکی‌شکل است. نتایج حاصل از آزمون مغناطیس‌سنج نمونه مرتعش (VSM) نشان داد مقدار مغناطش اشباع در نمونه 0/4=x به پایین‌ترین مقدار خود در مقایسه با سایر نمونه‌ها می‌رسد. این امر می‌تواند ناشی از ناهمگنی ساختار و حضور مقدار بیشتری از فازهای غیرمغناطیسی (BaFe2O4 و Fe2O3) در این نمونه نسبت به سایر نمونه‌ها باشد. نتایج آزمون حسگری در گاز استون نیز نشان داد نمونه هگزافریت باریم- کلسیم (0/2=x)، با وجود زمان بازیابی طولانی، از بالاترین حساسیت (0/28) و کوتاه‌ترین زمان پاسخ (15 ثانیه) در غلظت ppm 900 و دمای 200 درجه سانتی‌گراد برخوردار است.

کلیدواژه‌ها


عنوان مقاله [English]

Structural, Magnetic and Acetone Sensing Properties of Barium- Calcium Hexaferrite Synthesized by Sol- Gel Auto Combustion Method

نویسندگان [English]

  • A. Karimian
  • M. Kalantar
Engineering Faculty of Mining and Metallurgy, Yazd University, Yazd, Iran.
چکیده [English]

In this research, barium calcium hexaferrite (Ba1-xCaxFe12O19 , 0≤x£1) nanoparticles were synthesized through a sol-gel combustion method. The dried gel samples were then calcined at 950ºC for 4:30h. The phase and microstructural evolution of calcined samples were investigated by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results revealed formation of calcium -barium hexaferrite phase with a small amount of hematite as a secondary phase.  The average particle size is between 60-100 nm and the particle morphology is hexagonal or plate like structure. Results of a vibrating sample magnetometer (VSM) showed that the sample with x=0.4, exhibited the lowest value of saturation magnetization in comparison with others. This could be due to structural heterogeneity and presence of higher amounts of non- magnetic phases (BaFe2O4 and Fe2O3) in this sample compared to others. The results of sensory testing in acetone gas showed that the barium-calcium hexaferrite sample with x=0.2 had the highest sensitivity (0.28) and shortest response (15s) at a concentration of 900 ppm and a temperature of 200 °C despite of the long recovery time.

کلیدواژه‌ها [English]

  • Synthesis of barium-calcium ferrite
  • Sol-Gel autocombustion
  • gas sensor
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