Infrared Emission Property of (Ca, Cr) Co-doped YAG Ceramics

doi:10.15541/jim20160199

Abstract

Abstract:

(Ca, Cr) co-doped YAG ceramics were synthesized by high temperature solid state reaction. The effects of Ca²⁺ and Cr³⁺ ions doping on the infrared emission properties of YAG ceramics were investigated. X-ray diffraction results showed that the phase composition of the prepared samples were yttrium aluminum garnet, which indicated that the Ca²⁺ and Cr³⁺ irons were incorporated into the crystal lattice of yttrium-aluminate garnet structure. Infrared absorption results showed that the infrared absorptivity of the (Ca, Cr) co-doped samples was 0.90, which was 29 times higher than that of the pure YAG sample (0.03). The band gap of YAG ceramics were decreased 1.77 eV by Ca²⁺ and Cr³⁺ co-doping based on calculation of the absorbance test results. Therefore, the absorption of the free carrier was improved, which is the main reason why the (Ca, Cr) co-doping YAG ceramics have a high emissivity in near infrared wavelength.

Key words: co-doped, infrared emissivity, near-infrared absorption, the band gap

CLC Number:

TQ174

BU Cong-Hao, HE Gang, LI Jiang-Tao. Infrared Emission Property of (Ca, Cr) Co-doped YAG Ceramics[J]. Journal of Inorganic Materials, 2016, 31(10): 1094-1098.

Figures/Tables 5

Fig. 1 XRD patterns of Y2.5Ca0.5Cr0.5Al4.5O12 (a) and Y3Al5O12 (b) ceramic samples

Fig. 2 SEM images of Y3Al5O12 (a) and Y2.5Ca0.5Cr0.5Al4.5O12 (b) ceramic samples

Fig. 3 Absorptivity spectra of Y3Al5O12, Y3Cr0.5Al4.5O12 and Y2.5Ca0.5Cr0.5Al4.5O12 ceramic samples

Fig. 4 Absorbance spectra (a) and plot of hν~(αhν)2 (b) of Y3Al5O12, Y3Cr0.5Al4.5O12 and Y2.5Ca0.5Cr0.5Al4.5O12 ceramic samples

Table1 Infrared emissivity of Y3Al5O12, Y3Cr0.5Al4.5O12 and Y2.5Ca0.5Cr0.5Al4.5O12 ceramic samples

Sample	3-5 μm	8-14 μm
E1	0.43	0.88
E2	0.61	0.89
E3	0.83	0.90

References 15

[1]	IMRE B.High infrared emissivity coating for energy conservation and protection of inner surfaces in furnaces.Global Energy Issues, 2002, 17(1/2): 60-67.
[2]	GERALDINE J H, MASATSUGU N.High-emissivity coatings on reactor tubes and furnace walls in steamcracking furnaces. Chemical Engineering Science, 2004, 59(22): 5657-5662.
[3]	PAUL C S.High Emissivity coatings for improved performance of electric arc furnaces.Iron and Steel Technology, 2006, 3(2): 49-53.
[4]	TOM K, BILL F.Fuel Savings with High Emissivity Coatings. 71st Conference on Glass Problems, 2011, 32(1): 125-136.
[5]	HE X D, LI Y B, WANG L D, et al.High emissivity coatings for high temperature application: progress and prospect.Thin Solid Films, 2009, 517(17): 5120-5129.
[6]	HAN Z, LI X W, YE J K, et al.Significantly enhanced infrared emissivity of LaAlO3 by co-doping with Ca2+ and Cr3+ for energy-saving applications.Journal of the American Ceramic Society, 2015, 98(8): 2336-2339.
[7]	SUGIMOTO A, NOBE Y, YAMAGISHI K.Crystal growth and optical characterization of Cr, Ca: Y3Al5O12.Journal of Crystal Growth, 1994, 140(3/4): 349-354.
[8]	ZANETA D, PETRA S, NATALIIA G, et al.Study of ceramic pigments based on cobalt doped Y2O3-Al2O3 system.Journal of Thermal Analysis and Calorimetry, 2014, 116(2): 647-654.
[9]	XU X D, ZHAO Z W, SONG P X, et al.Effects of growth atmosphere, annealing temperature, Cr content, and Ca/Cr ratio on the Cr4+ absorption of Cr, Yb: YAG crystals.Journal of the Optical Society of America B, 2004, 21(7): 1289-1293.
[10]	BUTLER M A.Photoelectrolysis and physical properties of the semiconducting electrode WO2.Journal of Applied Physics, 1977, 48(5): 1914-1920.
[11]	XU Y N, CHING W Y.Electronic structure of yttrium aluminum garnet Y3Al5O12.Physical Review B, 1999, 59(16): 530-535.
[12]	ZHOU T, ZHANG L, YANG H, et al.Effects of sintering aids on the transparency and conversion efficiency of Cr4+, ions in Cr: YAG transparent ceramics.Journal of the American Ceramic Society, 2015, 98(8): 2459-2464.
[13]	FELDMAN R, SHIMONY Y, BURSHTEIN Z, et al.Dynamics of chromium ion valence transformations in Cr, Ca: YAG crystals used as laser gain and passive Q-switching media.Optical Materials, 2003, 24(1/2): 333-344.
[14]	ISHIBASHI S, NAGANUMA K, YOKOHAMA I.Cr, Ca: Y3Al5O12, laser crystal grown by the laser-heated pedestal growth method.Journal of Crystal Growth, 1998, 183(4): 614-621.
[15]	WANG F, QIAN X Q, LI X W, et al.Optical-thermal properties of reduced TiO2 microspheres prepared by flame spraying.Materials Letters, 2015, 151(6A): 82-84.