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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Investigation of intrinsic and extrinsic defects in solid solution Gd-3(Al,Ga) O-5(12) crystals grown by the Czochralski method
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Investigation of intrinsic and extrinsic defects in solid solution Gd-3(Al,Ga) O-5(12) crystals grown by the Czochralski method

机译：用直拉法生长固溶体Gd-3（Al，Ga）O-5（12）晶体的本征和外在缺陷的研究

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摘要

Mixed garnet crystals with nominal stoichiometry Gd3Al2.5Ga2.5O12 undoped, single doped with Sm3+, Ho3+, Er3+ and Yb3+ and co-doped with Ho3+ + Yb3+ and Er3+ + Yb3+ were grown by the Czochralski method. Optical spectra and thermal conductivity of obtained single crystal samples were measured and analyzed. Recorded optical absorption spectra revealed that the intensity and spectral characteristics of color centre absorption in the UV region, close to the UV absorption edge of the host, are affected by the type of incorporated rare earth ions. On the other hand, spectral characteristics of stable color centers induced by an intense UV irradiation of crystals depend weakly on the rare earth admixture. Low temperature optical spectra provided the evidence that Sm3+ ions and Er3+ ions occupy at least two different types of sites in this host but Yb3+ ions seem to be located preferentially in identical sites. Thermal conductivity of the crystals at 300 K, weakly affected by incorporated rare earth ions, is comparable to that reported for ordered gallium gadolinium garnet crystals. At cryogenic temperatures, i.e. below ca 80 K, thermal conductivities of the crystals containing rare earth ions are markedly smaller than that of undoped one, however. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过Czochralski方法生长了未掺杂，单掺杂Sm3 +，Ho3 +，Er3 +和Yb3 +以及共掺杂Ho3 + + Yb3 +和Er3 + + Yb3 +的标称化学计量为Gd3Al2.5Ga2.5O12的石榴石混合晶体。测量和分析获得的单晶样品的光谱和热导率。记录的光学吸收光谱揭示，在紫外区域内，靠近主体的紫外吸收边缘的色心吸收的强度和光谱特性受掺入稀土离子类型的影响。另一方面，由强烈的紫外线照射晶体引起的稳定色心的光谱特性在某种程度上取决于稀土元素的混合物。低温光谱提供了证据，表明Sm3 +离子和Er3 +离子在该宿主中占据至少两种不同类型的位点，但Yb3 +离子似乎优先位于相同的位点。受掺入稀土离子影响较小的300 K晶体的热导率与报道的有序镓g石榴石晶体的热导率相当。但是，在低温下，即低于80 K，含稀土离子的晶体的热导率明显小于未掺杂的晶体。 （C）2016 Elsevier B.V.保留所有权利。

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