نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 استادیار، گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، آذربایجان شرقی، ایران
2 دانشیار، گروه مهندسی مواد و متالورژی، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، آذربایجان شرقی، ایران
3 دانشجوی کارشناسی ارشد، گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، آذربایجان شرقی، ایران
چکیده
چکیده در این پژوهش، ریزساختار و خواص دی‌الکتریک چندسازه پلی‌وینیل الکل ـ تیتانات مس کلسیم (CCTO-PVA)، با درصدهای وزنی صفر، 10، 30 و 70 فاز سرامیکی به‌عنوان افزاینده خواص دی‌الکتریک بررسی شد. برای تهیه چندسازه، نخست، ذرات CCTO از تکلیس مخلوط مواد اولیه اکسیدهای مس و تیتانیم و کربنات کلسیم، در دمای 1000 درجه سلسیوس به‌دست آمد. سپس محلول‌هایی با مقادیر مناسبی از PVA در آب تهیه و ذرات CCTO براساس درصد وزنی چندسازه به آن‌ها اضافه شد. در انتها، مخلوط در دمای 60 درجه سلسیوس خشک شد. نتایج الگوی پراش پرتو ایکس (XRD) نشان داد که با افزایش میزان فاز CCTO در چندسازه‌ها، از ارتفاع قله نیمه‌بلوری PVA به‌شدت کاسته می‌شود. تصاویر میکروسکوپ الکترونی روبشی (SEM) نمایانگر آن بود که ذرات CCTO به‌خوبی در فاز پلیمری پراکنده شده‌اند. از بررسی نتایج خواص دی‌الکتریک اندازه‌گیری‌شده مشخص شد که برای ذرات CCTO، ثابت دی‌الکتریک و فاکتور اتلاف در بسامد یک کیلوهرتز، به‌ترتیب، حدود 1360 و 04/0 است، درحالی‌که این پارامترها برای PVA، به‌ترتیب، 4 و 15/0 است. با افزایش مقدار فاز سرامیکی در چندسازه از صفر به 70 درصد وزنی، ثابت دی‌الکتریک از 4 به 68 افزایش و فاکتور اتلاف از 17/0 به 04/0 کاهش یافت. مقایسه رفتار خواص دی‌الکتریک با نتایج مدل‌های پیش‌بینی‌کننده، آشکار کرد که رفتار چندسازه با مدل لگاریتمی بیشتر همخوانی دارد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Investigating microstructure and dielectric properties of a composite based on Polyvinyl alcohol - CaCu3Ti4O12
نویسندگان [English]
- Siamak Alipour 1
- Mohammad Maleki Shahraki 2
- Javad Kolivandzadeh 3
1 Assistant Professor, Department of Chemical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran
2 Associate Professor, Department of Materials Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran
3 M. Sc. Student, Department of Chemical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran
چکیده [English]
Abstract The current study aims to investigate the microstructural and dielectric properties of the composite based on Polyvinyl alcohol-CaCu3Ti4O12 (CCTO-PVA) containing 0, 10, 30, and 70 wt % ceramic phase as the dielectric promoter. To this end, CCTO particles were first prepared by calcination of CuO, TiO2, and CaCO3 mixture at 1000 °C to fabricate the composite. Then, solutions with adequate amounts of PVA in water were provided, and the CCTO was added to solutions considering the composite weight percentage. Finally, the mixtures were dried at 60 °C. The X-Ray Diffraction (XRD) results of the powder indicated that upon increasing the amount of CCTO considerably, the semi-crystal peak height of the PVA would decrease. In addition, according to Scanning Electron Microscopy (SEM), the CCTO particles were dispersed preferably well in the polymeric phase. Dielectric properties were measured at 1 KHz, and the findings revealed that the dielectric constant and dissipation factors of the CCTO were measured as 1360 and 0.04, respectively. Moreover, these parameters of the PVA were obtained as 4 and 0.15, respectively. Increasing the CCTO weight percent of composites from zero to 70 % would increase the dielectric constant from 4 to 68 and reduce the dissipation factor from 0.17 to 0.04. The comparison of the dielectric constants with the results from different models indicated that the composite behavior was in good agreement with the logarithm model output.
کلیدواژه‌ها [English]
- Composite
- CaCu3Ti4O12
- Dielectric Properties
- Polyvinyl Alcohol
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