کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1678758 1009960 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Charge compensation by in-situ heating for insulating ceramics in scanning electron microscope
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Charge compensation by in-situ heating for insulating ceramics in scanning electron microscope
چکیده انگلیسی

With a steady temperature increase under high vacuum (HV) in an environmental scanning electronic microscope, we observed charge-free characterization and fine secondary electron (SE) images in focus for insulating ceramics (alumina (Al2O3), aluminum nitride (AlN), pure magnesium silicate (Mg2SiO4)). The sample current Isc increased from −8.18×10−13 to 2.76×10−7 A for Al2O3 and −9.28×10−12 to 2.77×10−6 A for AlN with the temperature increased from 298 to 633 K. The surface conductance σ increased from 5.6×10−13 to 5.0×10−11/Ω for Al2O3 and 1.1×10−12 to 1.0×10−7/Ω for AlN with the temperature increased from 363 to 593 K. The SE image contrast obtained via heating approach in high vacuum with an Everhart–Thornley SE-detector was better than that via conventional approach of electron–ion neutralization in low vacuum (LV) with a gaseous SE-detector. The differences of compensation temperatures for charge effects indicate dielectric and thermal properties, and band structures of insulators. The charge compensation mechanisms of heating approach mainly relate to accelerated release of trapped electrons on insulating surface and to increase of electron emission yield by heating.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 109, Issue 11, October 2009, Pages 1326–1332
نویسندگان
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