Europium gallium garnet (Eu3Ga5O12) and Eu3GaO6: Synthesis and material properties
Europium gallium garnet (Eu3Ga5O12) and Eu3GaO6: Synthesis and material properties
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DOI：
10.1063/1.4964444
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发表时间：
2016-10
影响因子：
3.2
通讯作者：
K. Sawada;Toshihiro Nakamura;S. Adachi
中科院分区：
文献类型：
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作者：
K. Sawada;Toshihiro Nakamura;S. Adachi
以立方相（c-）Eu 2 O3和单斜相Ga 2 O3（β-Ga 2 O3）为原料，采用固相反应法，在Tc = 1200 °C下煅烧合成了Eu-Ga-O三元化合物。利用X射线衍射分析、光致发光（PL）分析、PL激发（PLE）光谱和拉曼散射测量研究了Eu-Ga-O三元化合物的结构和光学性质。在x = 0.375和0.75 [x <$Eu_2O_3/（Eu_2O_3 + Ga_2O_3）]的摩尔比下，分别合成了立方晶系Eu_3Ga_5O_（12）（EGG）和正交晶系Eu_3GaO_6，以及终点二元化合物β-Ga_2O_3（x = 0）和单斜晶系（m-）Eu_2O_3（x = 1.0）。Eu_2O_3由立方晶系转变为单斜晶系是由于在Tc ≥ 1050 °C时发生结构相变所致。原则上，钙钛矿型EuGaO 3和单斜晶系Eu 4Ga 2 O 9也可以分别在x = 0.5和0.667时合成，但是，这样的化学计量化合物不能在此条件下合成。
Eu−Ga−O ternary compounds were synthesized from a mixture of cubic (c-) Eu2O3 and monoclinic Ga2O3 (β-Ga2O3) raw powders using the solid-state reaction method by calcination at Tc = 1200 °C. The structural and optical properties of the Eu−Ga−O ternary compounds were investigated using X-ray diffraction analysis, photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and Raman scattering measurements. Stoichiometric compounds such as cubic Eu3Ga5O12 (EGG) and orthorhombic Eu3GaO6 were synthesized using molar ratios of x = 0.375 and 0.75 [x≡Eu2O3/(Eu2O3 + Ga2O3)], respectively, together with the end-point binary compounds β-Ga2O3 (x = 0) and monoclinic (m-) Eu2O3 (x = 1.0). The structural change from “cubic” to “monoclinic” in Eu2O3 is due to the structural phase transition occurring at Tc ≥ 1050 °C. In principle, the perovskite-type EuGaO3 and monoclinic Eu4Ga2O9 can also be synthesized at x = 0.5 and 0.667, respectively; however, such stoichiometric compounds could not be synthesized in this s...