Preparation and Infrared Radiation Property of Lanthanum-cerium Oxide Ceramics by (Ca,Fe) Co-doping

doi:10.15541/jim20150340

Abstract

Abstract:

(Ca,Fe) co-doped lanthanum-cerium oxide (La_1.9Ca_0.1Ce_1.9Fe_0.1O₇) infrared radiation ceramics were prepared via solid state reaction by using La₂O₃, CeO₂, CaO and Fe₂O₃ as starting materials. The phase, micro-structure, chemical composition, UV-Vis-NIR reflectivity spectrum, and UV-Vis absorption spectrum of the samples were characterized by X-ray diffractometer, scanning electron microscopy, energy dispersive X-ray spectroscopy, and UV-Vis-NIR spectrophotometer. The infrared emissivity of the samples in 3-5 μm waveband was also measured by an infrared emissometer. The phase and EDS analysis showed the co-doped sample also had fluorite structure, indicating that Ca and Fe irons entered the crystal lattice of lanthanum-cerium oxide. An impurity energy level was introduced into lanthanum-cerium oxide by co-doping of Ca and Fe irons, which enhanced the free-carrier absorption and impurity energy level absorption of the sample. This led to a significant increase of absorption and emission in the region of 0.75-5 μm, transforming lanthanum-cerium oxide ceramic from high reflection to high absorption (radiation) ceramic after (Ca,Fe) co-doping. The (Ca,Fe) co-doped sample exhibited an absorptivity of 0.88 in 0.75-2.5 μm waveband and an infrared emissivity of 0.752 in 3-5 μm waveband, increasing by 1660% and 60%, respectively, as compared with that of pure La₂Ce₂O₇ ceramic sample.

Key words: lanthanum-cerium oxide ceramic, doping, near-infrared absorption, infrared emissivity

CLC Number:

TQ174

WANG Feng, BU Cong-Hao, YE Jian-Ke, LI Jiang-Tao, HE Zhi-Yong, ZHANG Qi-Fu. Preparation and Infrared Radiation Property of Lanthanum-cerium Oxide Ceramics by (Ca,Fe) Co-doping[J]. Journal of Inorganic Materials, 2016, 31(2): 185-189.

Figures/Tables 4

Fig. 1 XRD patterns of La2Ce2O7 and La1.9Ca0.1Ce1.9Fe0.1O7 ceramic samples

Fig. 2 SEM images and EDS patterns of La2Ce2O7 (a) and La1.9Ca0.1Ce1.9Fe0.1O7 (b) ceramic samples

Fig. 3 UV-Vis-NIR reflectivity spectra of La2Ce2O7 and La1.9 Ca0.1Ce1.9Fe0.1O7 ceramic samples

Fig. 4 Absorption spectra (a) and plot of hν~(αhν)2 (b) of La2Ce2O7 and La1.9Ca0.1Ce1.9Fe0.1O7 ceramic samples

References 16

[1]	BLOSSER M L, POTEET CC, CHEN R R, et al.Development of advanced metallic-thermal-protection system prototype hardware.Journal of Spacecraft and Rockets, 2004, 41(2): 183-194.
[2]	LIU H Z, OUYANG J H, LIU Z G, et al.Thermo-optical properties of LaMAl11O19 (M=Mg,Mn,Fe) hexaalumiantes for high-temperature thermal protection applications. Journal of the American Ceramic Society, 2011, 94(10): 3195-3197.
[3]	LIU H Z, LIU Z G, OUYANG J H, et al.Thermo-optical properties of LaMg1-xNixAl11O19 (0≤x≤1) hexaaluminates for metallic thermal protection system.Materials Letters, 2011, 65(17/18): 2614-2617.
[4]	MANARA J, ARDUINI-SCHUSTER M, RÄTZER-SCHEIBE H J, et al. Infrared-optical properties and heat transfer coefficients of semitransparent thermal barrier coatings.Surface&Coating Technology, 2009, 203(8): 1059-1068.
[5]	HUANG J P, FAN C L, SONG G P, et al.Enhanced infrared emissivity of CeO2 coating by La doping.Applied Surface Science, 2013, 280(1): 605-609.
[6]	HUANG J P, LI Y B, HE X D, et al.Enhanced spectral emissivity of CeO2 coating with cauliflower-like microstructure.Applied Surface Science, 2012, 259(12): 301-305.
[7]	CAO X Q, VASSEN R, FISCHER W, et al.Lanthanum-cerium oxide as a thermal barrier-coatings materials for high-temperature applications.Advanced Materials, 2003, 15(17): 1438-1442.
[8]	MA W.Study on The modification of the High Temperature of La2Ce2O7 and Its Thermal Barrier Coatings with Double Ceramic layers. Beihang University, 2006.
[9]	MA W, GONG S K, XU H B, et al.On improving the phase stability and thermal expansion coefficients of lanthanum cerium oxide solid solutions.Scripta Materialia, 2006, 54(8): 1505-1508.
[10]	MANDAL B P, GARG N, SHARMA S M, et al.Preparation, XRD and Raman spectroscopic studies on new compounds RE2Hf2O7 (RE=Dy, Ho, Er,Tm,Lu,Y): pryrochlores or defect- fluorite?.Journal of Solid State Chemistry, 2006, 179(7): 1990-1994.
[11]	WANG L, SONG J, DAI L, et al.Investigation on effect of Ca doping on properties of proton conductors La2-xCaxCe2O7-δ.Chinese Journal of Inorganic Chemistry, 2013, 29(2): 367-373.
[12]	BUTLER M A.Photoelectrolysis and physical properties of the semiconducting electrode WO3.Journal of Applied Physics, 1977, 48(5): 1914-1920.
[13]	SUN H D, CHANG D D, FAN Z.Study on high emissivity infrared coatings.Chinese Journal of Infrared Research, 1990, 9(5): 401-404.
[14]	OUYANG D G, ZHOU M S, ZHANG Q G, et al.Analysis on route to improvement in radiation quality of infrared radiation paint.Research on Iron & Steel, 2000, 28(3): 34-37.
[15]	HAN Z, LIU J, LI X W, et al.Ca2+-doped LaCrO3: a novel energying-saving materials with high infrared emissivity.Journal of the American Ceramic Society, 2014, 97(9): 2705-2708.
[16]	WANG S M.Effects of Fe on crystallization and properties of a new high infrared radiance glass-ceramics.Environmental Science&Technology, 2010, 44(12): 4816-4820.