کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1489381 992306 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural, microstructural and electrical properties of BiFeO3–BaTiO3 ceramics with high thermal stability
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Structural, microstructural and electrical properties of BiFeO3–BaTiO3 ceramics with high thermal stability
چکیده انگلیسی

Structural, microstructural, electrical properties and their thermal stability for (1 − x)BF–xBT system where x ranges from 0.20 to 0.35 have been investigated. Its phase diagram shows a morphortropic phase boundary (MPB) with the coexistence of rhombohedral and pseudo-cubic phases for the composition around 0.275 ≤ x ≤ 0.30. The optimized piezoelectric properties with d33 varied from 50 to 136 pC/N and the planar electromechanical coupling factor kp varied from 0.165 to 0.312 over a broad high Curie temperature range from 380 to above 600 °C were obtained. The results indicated that samples with pseudo-cubic phase began to depole far below Curie point, while samples with rhombohedral phase showed good resistance to thermal depoling. A high thermal stability with Td = 460 °C, combining a high d33 value of 116 pC/N, was obtained in (1 − x)BF–xBT ceramics prepared by the conventional ceramic processing technique. The internal bias field in rhombohedral phase would stabilize the remnant polarization and favor the thermal stability.

Figure optionsDownload as PowerPoint slideHighlights
► A morphortropic phase boundary (MPB) with the coexistence of rhombohedral and pseudo-cubic phases was found.
► Rhombohedral phase showed better resistance to thermal depoling than that of pseudo-cubic phase.
► A high thermal stability with Td = 460 °C, combining a high d33 value of 116 pC/N, was obtained.
► The internal bias field would stabilize the remnant polarization and favor the thermal stability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 47, Issue 12, December 2012, Pages 4233–4239
نویسندگان
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