کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1524444 1511837 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of dense lead lanthanum titanate ceramics prepared from powders synthesized by the oxidant peroxo method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Characterization of dense lead lanthanum titanate ceramics prepared from powders synthesized by the oxidant peroxo method
چکیده انگلیسی
Nanosized powders of lead lanthanum titanate (Pb1−xLaxTiO3) were synthesized by means of the oxidant-peroxo method (OPM). Lanthanum was added from 5 to 30% in mol through the dissolution of lanthanum oxide in nitric acid, followed by the addition of lead nitrate to prepare a solution of lead and lanthanum nitrates, which was dripped into an aqueous solution of titanium peroxo complexes, forming a reactive amorphous precipitate that could be crystallized by heat treatment. Crystallized powders were characterized by FT-Raman spectroscopy and X-ray powder diffraction, showing that tetragonal perovskite structure is obtained for samples up to 25% of lanthanum and cubic perovskite for samples with 30% of lanthanum. Powders containing 25 and 30% in mol of lanthanum were calcined at 700 °C for 2 h, and in order to determine the relative dielectric permittivity and the phase transition behaviour from ferroelectric-to-paraelectric, ceramic pellets were prepared and sintered at 1100 or 1150 °C for 2 h and subjected to electrical characterization. It was possible to observe that sample containing 25% in mol of La presented a normal behaviour for the phase transition, whereas the sample containing 30% in mol of La presented a diffuse phase transition and relaxor behaviour.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 124, Issues 2–3, 1 December 2010, Pages 1051-1056
نویسندگان
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