کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1475314 991115 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural, dielectric, and piezoelectric properties of fine-grained NBT–BT0.11 ceramic derived from gel precursor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Structural, dielectric, and piezoelectric properties of fine-grained NBT–BT0.11 ceramic derived from gel precursor
چکیده انگلیسی

(Na1/2Bi1/2)TiO3 doped in situ with 11 mol% BaTiO3 (NBT–BT0.11) powders were synthesized by a sol–gel method, and the electrical properties of the resulting ceramics were investigated. The powders consisting of uniform and fine preliminary particles of about 50 nm were prepared by calcining the gel precursor at 700 °C. (Na1/2Bi1/2)0.89Ba0.11TiO3 ceramics, sintered at temperatures up to 1150 °C have a rhombohedral symmetry, while the ceramic sintered at 1200 °C exhibits a tetragonal crystalline structure. The ceramics show high dielectric constant (ɛr ∼ 5456), dielectric loss of 0.02, depolarization temperature Td ∼ 110 °C and temperature corresponding to the maximum value of dielectric constant Tm ∼ 262 °C. The dielectric constant (ɛ33) and the piezoelectric constant (d33) attain the maximum values of 924 and 13 pC/N, respectively, while the electromechanical coupling factor (kp) value is 0.035. The NBT–BT0.11 ceramics derived from sol–gel present high mechanical quality factor (Qm ∼ 860). The dielectric and piezoelectric properties values of NBT–BT0.11 ceramics derived from sol–gel are smaller than those of samples produced by the conventional solid state reaction method, due to the grains size and oxygen vacancies that generate dipolar defects.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 32, Issue 10, August 2012, Pages 2389–2397
نویسندگان
, , , , , , ,