Influence of calcium concentration on formation of tetravalent chromium doped Y3Al5O12 ceramics

被引：35

作者：

Chaika, M. A. ^{[1
,3
]}

Dulina, N. A. ^{[1
]}

Doroshenko, A. G. ^{[1
]}

Parkhomenko, S. V. ^{[1
]}

Gayduk, O. V. ^{[1
]}

Tomala, R. ^{[2
]}

Strek, W. ^{[2
]}

Hreniak, D. ^{[2
]}

Mancardi, G. ^{[4
]}

Vovk, O. M. ^{[1
]}

机构：

[1] Natl Acad Sci Ukraine, STC Inst Single Crystals, 60 Nauky Ave, UA-61072 Kharkov, Ukraine

[2] Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2, PL-50422 Wroclaw, Poland

[3] Polish Acad Sci, Inst Phys, Al Lotnikow 32-46, PL-02668 Warsaw, Poland

[4] UCL, Dept Chem, Gower St, London WC1E 6BT, England

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 12期

关键词：

Vacuum sintering; Impurities; Optical properties; Cr-4(+):YAG; OPTICAL-PROPERTIES; CRYSTAL-GROWTH; TEMPERATURE; CR4+YAG; PERFORMANCE; ABSORPTION; SCATTERING; COMPOSITE; SPECTRA; LIGHT;

D O I：

10.1016/j.ceramint.2018.04.182

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Yttrium Aluminium Garnet (YAG) ceramics doped with chromium were prepared by solid-state reactive sintering in a vacuum. The influence of the charge compensator Ca2+ concentration on microstructure, optical properties and efficacy of Cr3+ oxidation to Cr4+ under air annealing was investigated. A non-monotonic dependence of these features on the amount of CaO as an additive was found. The changes in ceramic transparency and microstructure were explained considering the interaction between CaO and Cr2O3 at the ceramic grain boundaries, which leads to a different pore evolution in distinct samples during sintering. The efficacy of the oxidation of Cr3+ to Cr4+ strongly depends on the concentration of Ca dissolved in the YAG. The calcium solubility decreases due to the higher oxygen partial pressure of the extra phases on the grain boundaries that decreases the amount of generated Cr4+ ions. Such phenomenon explains the lower concentration of Cr4+ ions in the sample with 0.8% of Ca against the one with 0.5%. The experiment shows that the ceramic with 0.5% of Ca has a better inline transmission and a higher concentration of Cr4+ ions in comparison with samples with a different Ca concentration.

引用

页码：13513 / 13519

页数：7

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