التفاصيل البيبلوغرافية
| العنوان: |
Charakterizace mikrostruktury transparentní YAG keramiky pomocí mikroskopické obrazové analýzy se zvláštním ohledem na velikostní čísla zrn ; Quantitative microstructural characterization of transparent YAG ceramics via microscopic image analysis using stereological relations |
| المؤلفون: |
Uhlířová, Tereza, Hostaša, Jan, Pabst, Willi, Esposito, Laura |
| المجموعة: |
Czech Academy of Sciences: dKNAV / Knihovna Akademie věd České Republiky |
| مصطلحات موضوعية: |
transparent ceramics, YAG (yttrium aluminum garnet), image analysis via stereological relations, mean chord length, Jeffries size, interface density, mean curvature integral density, ASTM (equivalent) grain size number, transparentní keramika, YAG (yttrium-aluminium granát), obrazová analýza pomocí stereologických vztahů, střední délka úseků, Jeffriesova velikost, hustota rozhraní, hustota integrálu středního zakřivení, ASTM (ekvivalentní) velikostní čísla zrn |
| جغرافية الموضوع: |
109-114 |
| الوصف: |
The microstructure of transparent yttrium-aluminum garnet (YAG) ceramics is characterized using different microstructural descriptors, with special focus on grain size numbers. Both linear and planar grain size numbers are used to describe the dependence of the average grain size on Yb dopant content (0 - 10 at.%),sintering additive (tetraethyl orthosilicate, TEOS) content (0.3 - 0.5 wt.%) and firing time. Although the two grain size numbers are very close for the materials studied (with ratios very close to unity, around 0.987 ± 0.109), these two numbers are principally independent and provide complementary microstructural information. Their relations to other microstructural descriptors (interface density, mean curvature integral density, mean chord length, Jeffries size) are discussed throughout the text. It isfound that Yb doping of more than 3 at.% has a grain-growth-inhibiting effect (after sufficiently long firing times), but differences in the TEOS content between 0.3 and 0.5 wt.% do not have any sensible effect. The largest effect on the microstructure is exerted by the firing time (with prolonged firing times leading to grain growth), but with higher Yb doping the effect of firing time on the grain size becomes less pronounced: for YAG samples without Yb doping, increasing the firing time by a factor of 8 (from 2 h to 16 h), deceases the grain size number by 33.2 - 35.0 %, whereas with a Yb dopant content of 10 at.%, the corresponding decrease in the grain size number is only 8.7 - 10.0 %. These findings are fully corroborated using the other microstructural descriptors. ; Mikrostruktura transparentní keramiky YAG (yttrium-aluminium granát) byla charakterizována pomocí různých deskriptorů se zaměřením na velikostní čísla zrn. Jak lineární, tak planární velikostní čísla zrn byla použita k popisu závislosti průměrné velikosti zrn na koncentraci ytterbitého (Yb) dopantu (0 - 10 at. %), koncentraci slinovací přísady - tetraethylorthosilikát, TEOS (0,3 - 0,5 hm. %) a době slinování. Přestože obě tato ... |
| نوع الوثيقة: |
other/unknown material |
| وصف الملف: |
média; svazek |
| اللغة: |
Czech |
| العلاقة: |
https://kramerius.lib.cas.cz/view/uuid:15613a20-5572-4338-a18c-1e3262fc36c5Test |
| الإتاحة: |
https://kramerius.lib.cas.cz/view/uuid:15613a20-5572-4338-a18c-1e3262fc36c5Test |
| حقوق: |
policy:public |
| رقم الانضمام: |
edsbas.8299379F |
| قاعدة البيانات: |
BASE |
