کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1475249 991113 2013 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sintering and microstructure of potassium niobate ceramics with stoichiometric composition and with potassium- or niobium excess
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Sintering and microstructure of potassium niobate ceramics with stoichiometric composition and with potassium- or niobium excess
چکیده انگلیسی

Stoichiometric potassium niobate (KNbO3) and materials with K- and Nb excess show marked differences in sintering behaviour and microstructure. Shrinkage is shifted to lower temperatures in material with K-excess and to higher temperatures in material with Nb-excess compared to the stoichiometric KNbO3. The stoichiometric material densified to 4.36 g/cm3, whereas the densities of the off-stoichiometric materials remained lower. Abnormal grain growth leading to grains up to 500 μm in size was observed for stoichiometric KNbO3. K-excess KNbO3 shows cuboid grain shape with size between 20 and 60 μm. In the Nb-excess KNbO3 the grains remain small. Approaches to improve the densification of the KNbO3 materials are discussed by investigating processing variations specific for each composition. The objective of our work is to analyze the interrelations between stoichiometry, materials characteristics and processing stability of alkaline niobate ceramics. The results on KNbO3 mark a starting point for investigations on complex high performance systems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 33, Issue 11, October 2013, Pages 2127–2139
نویسندگان
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