کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5440684 | 1398235 | 2017 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This paper presents the mechanical behavior of LaCoO3 and La0.8Ca0.2CoO3 ceramics under four-point bending in which the two cobaltites are subjected to a low stress of â¼8 MPa at temperatures ranging from room temperature to 1000 °C. Unexpected stiffening is observed in pure LaCoO3 in the 700-900 °C temperature range, leading to a significant increase in the measured Young's modulus, whereas La0.8Ca0.2CoO3 exhibits softening from 100 °C to 1000 °C, as expected for most materials upon heating. Neutron diffraction, X-ray diffraction and micro-Raman spectroscopy are used to study the crystal structure of the two materials in the RT-1000 °C temperature range. Despite a detailed study, there is no conclusive evidence to explain the stiffening behavior observed in pure LaCoO3 as opposed to the softening behavior in La0.8Ca0.2CoO3 at high temperatures (above 500 °C).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 4, April 2017, Pages 1563-1576
Journal: Journal of the European Ceramic Society - Volume 37, Issue 4, April 2017, Pages 1563-1576
نویسندگان
Amjad Aman, Ryan Jordan, Yan Chen, Richard Stadelmann, Mykola Lugovy, Nina Orlovskaya, E. Andrew Payzant, Clarina dela Cruz, Michael J. Reece, Thomas Graule, Jakob Kuebler,