Kinetics of Cr3+ to Cr4+ ion valence transformations and intra-lattice cation exchange of Cr4+ in Cr,Ca:YAG ceramics used as laser gain and passive Q-switching media

被引：30

作者：

Chaika, M. A. ^{[1
,2
]}

Tomala, R. ^{[1
]}

Strek, W. ^{[1
]}

Hreniak, D. ^{[1
]}

Dluzewski, P. ^{[3
]}

Morawiec, K. ^{[3
]}

Mateychenko, P., V ^{[2
]}

Fedorov, A. G. ^{[2
]}

Doroshenko, A. G. ^{[2
]}

Parkhomenko, S., V ^{[2
]}

Lesniewska-Matys, K. ^{[4
]}

Podniesinski, D. ^{[4
]}

Kozlowska, A. ^{[4
]}

Mancardi, G. ^{[5
]}

Vovk, O. M. ^{[2
]}

机构：

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

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

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

[4] Inst Elect Mat Technol, 133 Wolczynska Str, PL-01919 Warsaw, Poland

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

来源：

JOURNAL OF CHEMICAL PHYSICS | 2019年 / 151卷 / 13期

关键词：

OPTICAL IN-SITU; CONVERSION EFFICIENCY; OXYGEN DIFFUSION; HIGH-TEMPERATURE; WHITE EMISSION; YAG; Y3AL5O12; OPTIMIZATION; ABSORPTION; ADDITIVES;

D O I：

10.1063/1.5118321

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper focuses on the kinetics of Cr4+ formation in Cr,Ca:YAG ceramics prepared by solid-state reaction sintering. The kinetics of Cr4+ formation was studied by annealing of Cr,Ca:YAG ceramics in ambient air under different temperatures at different times, resulting in the transformation of Cr3+ to Cr4+. The activation energy (E-a) of Cr3+ oxidation determined by the Jander model was 2.7 +/- 0.2 eV, which is in good correlation with the activation energy of innergrain oxygen diffusion in the YAG lattice. It is concluded that Cr3+ to Cr4+ transformation in YAG ceramics is limited by oxygen diffusion through the grain body. It was established that in Cr,Ca:YAG ceramics, the intralattice cation exchange, in which the Cr4+ ions exchange positions with the Al3+ ions, switching from "A" to "D" sites, is faster than Cr3+ to Cr4+ oxidation. In the temperature range of 900-1300 degrees C, the reaction enthalpy of Al3+/Cr4+ ion exchange between octahedral "A" and tetrahedral "D" lattice sites is close to zero, and this exchange ratio is thermodynamically driven by entropy.

引用

页数：10

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