کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1620992 1005741 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, characterization, and electrical studies on Cu-doped K2Ti6O13 lead-free ceramics: Role of defect associate dipoles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Synthesis, characterization, and electrical studies on Cu-doped K2Ti6O13 lead-free ceramics: Role of defect associate dipoles
چکیده انگلیسی

Pure and some copper doped (x = 0.01, 0.05, 0.1) ceramic specimens of K2Ti6O13 were synthesised using solid-state route. Lattice constants determined from room temperature XRD data revealed its single phase formation in a monoclinic symmetry. X-band EPR-data, recorded at RT, revealed the substitution of Ti4+ lattice sites by two different copper species corresponding to their distinct locally distorted environments. Dielectric data revealed the role of (Fe′Ti–VO)(Fe′Ti–VO)defect associate dipoles identified as low-field signals (g ∼ 5.43) in the EPR-spectra on the ferroelectric–paraelectric type phase transitions recognized in the ɛr(T) plots for all the compositions with distinct TC. Dielectric loss mechanism included space charge polarization, dipole orientation, and electrical conduction. Structural configuration was found to favour polaron conduction and impede the intratunnel ionic conduction. Moreover, electron-hopping conduction was dominant in the low-temperate region whereas intratunnel ionic conduction prevailed at higher temperatures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 489, Issue 2, 21 January 2010, Pages 700–707
نویسندگان
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