بررسی اثر آلاییدن 5/2% مولی سریم بر رفتار الکتروتنگش پیزوسرامیک عاری از سرب (
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
راضیه حیاتی
1
(دانشجوی دکترای مهندسی مواد، پژوهشگاه مواد و انرژی، کرج)
محمد علی بهره ور
2
(دانشیار و عضو هیات علمی پژوهشگاه مواد و انرژی، کرج)
تورج عبادزاده
3
(استاد و عضو هیات علمی پژوهشگاه مواد و انرژی، کرج)
کلید واژه: سرامیک بدون سرب BZT-50BCT, الکتروتنگش, CeO2, فروالکتریک,
چکیده مقاله :
در این پژوهش رفتار الکتروتنگش سرامیک‌های بدون سرب[(Ba0.85Ca0.15)1-xCex/2](Zr0.1Ti0.9)O3 (BCCexZT) که با استفاده از روش تف جوشی حالت جامد تهیه شدند، بررسی شد. این سرامیک‌ها درمحدوده‌ی دمایی °C1450-1350 به مدت 4 ساعت تف جوشی شدند و نقش آلاینده‌ی سریا بر رفتار الکتروتنگش آن‌ها مطالعه شد. فازهای بلوری و ریزساختار نمونه‌ها با استفاده از روش‌های پراش اشعه‌ی X (XRD) و میکروسکوب الکترونی (SEM) مطالعه شدند و از اندازه گیری منحنی‌های هیسترزیس کرنش-میدان و قطبش-میدان در دماهای مختلف برای محاسبه‌ی ضرایب الکتروتنگش استفاده شد. وابستگی دمایی قطبش و کرنش القایی از میدان نشان داد که ضرایب الکتروتنگش به دست آمده از هر دو نوع قطبش و کرنش تک قطبی و دو قطبی تقریباً با هم برابر است و با توجه به این که دمای کوری ترکیب BCCe0.025ZT در نزدیکی دمای محیط واقع شده است، در کل محدوده‌ی دمایی ̊C110-20 در حدود 90 تا 100% از قطبش و کرنش القایی به اثر الکتروتنگش نسبت داده می‌شود. ب. بر اساس نتایج به‌دست آمده، نمونه‌ی BCZT حاوی 5/2% مولی سریم که در دمای °C1450 تف جوشی شد بزرگترین ضرایب الکتروتنگش m4/C2 063/0=Q33 و m2/V216-10×4/3 M33= را دارا بود که از مقادیرگزارش شده برای انواع ترکیب‌های BZT-50BCT در سایر مقالات بزرگتر بوده و این ترکیب را قابل رقابت با انواع ترکیب‌های بر پایه‌‌ی سرب می‌نماید.
Lead-free [(Ba0.85Ca0.15)1-xCex/2](Zr0.1Ti0.9)O3 (BCCexZT) piezoceramics were synthesized using conventional solid-state ceramic processing. Sintering was carried out in the temperature range of 1350 - 1450 °C for 4 h. The microstructure and phase composition were investigated by scanning electron microscopy and X-ray diffraction. Polarization and strain measurements were done using a modified Sawyer-Tower circuit and a commercial aix-PES piezoelectric evaluation system was used to record the variations of polarization and strain with temperature. The addition of CeO2 decreased the Curie temperature of BCZT to near room temperature and consequently a high permittivity value was obtained at room temperature. Additionally, the temperature dependence of strain and polarization showed that electrostrictive coefficients calculated from the unipolar and bipolar loops were approximately the same. Since the Curie temperature of BCCe0.025ZT is shifted to around room temperature, 90-100% of induced polarization and strain is attributed to the electrostriction effect. The highest electrostrictive coefficients of Q33= 0.063 m4/C2 and M33=3.4E-16 m2/V2 were obtained for BCCe0.025ZT ceramics with 2.5 mol% Ce, which are higher than the corresponding values in previous reports and make this composition as a candidate for electrostrictive applications.
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