کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5440448 | 1398229 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Annealing induced discoloration of transparent YAG ceramics using divalent additives in solid-state reaction sintering
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Tetraethyl orthosilicate (TEOS) was commonly served as a sintering additive to promote the densification of transparent Y3Al5O12 (YAG) ceramics. However, Si4+ that decomposed from TEOS would restrain the conversion of dopants into a higher valence state (e.g., Cr3+ â Cr4+). In this study, by using divalent sintering additives (CaO and MgO), the colorless and highly transparent YAG ceramics (T = 84.6%, at 1064 nm) were obtained after vacuum sintering at 1840 °C for 8 h and without subsequent annealing in air. An absorption peak centered at â¼320 nm was observed before annealing, and it extended to â¼550 nm after annealing at 1450 °C for 10 h in air. A discoloration phenomenon occurred and more scattering centers were observed with the formation of new [Mg/Ca2+F+] color centers. Air annealing did not improve the optical quality of the as-fabricated YAG ceramics with divalent dopants as sintering additives, owing to the formation of scattering centers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 13, October 2017, Pages 4123-4128
Journal: Journal of the European Ceramic Society - Volume 37, Issue 13, October 2017, Pages 4123-4128
نویسندگان
Tianyuan Zhou, Le Zhang, Farida A. Selim, Rong Sun, Chingping Wong, Hao Chen, Qitu Zhang,