Fabrication and optical properties of transparent LaErZr2O7 ceramic with high excess contents of La and Er

Fabrication and optical properties of transparent LaErZr2O7 ceramic with high excess contents of La and Er
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高过量La、Er透明LaErZr2O7陶瓷的制备及光学性能

DOI:
10.1016/j.ceramint.2019.03.047
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发表时间:
2019-06
影响因子:
5.2
通讯作者:
Xu Kai
Xu Kai
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhao Wenwen;Zhang Kuibao;Li Weiwei;Luo Baozhu;Zhang Haibin;Xu Kai

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在本研究中,用纳米粉末在1850 °C真空烧结6 h,成功地制备了高过剩La和Er含量的LaErZr2O7透明陶瓷(名义上为La1.28Er1.28Zr2O7.84)。X射线衍射仪、扫描电子显微镜、能谱分析和透射电子显微镜分析结果表明,粉末样品经高温烧结后,由单一的焦绿石相转变为富La焦绿石相和富Er缺陷萤石相共存。过量的La和Er有利于焦绿石结构的形成。尽管存在两种相共存,但厚度为1 mm的样品在可见光到中红外区域具有良好的在线透过率(在1100 nm处透过率高达81%)。对980 nm激发下的上转换和红外发射进行了测量和讨论。
In this study, transparent LaErZr2O7ceramic with high excess La and Er contents (nominally La1.28Er1.28Zr2O7.84) was successfully prepared by vacuum sintering at 1850 °C for 6 h using nanosized powder. The XRD, SEM, EDX and TEM results reveal that the single pyrochlore phase in the powder sample transforms to the coexistence of La-rich pyrochlore phase and Er-rich defect fluorite phase after high temperature sintering. The high excess amounts of La and Er favor the formation of pyrochlore structure. Despite the coexistence of two phases, the sample with 1 mm thickness shows excellent in-line transmittance in the visible to mid-infrared region (as high as 81% at 1100 nm). The upconversion and infrared emission under 980 nm exciting were measured and discussed as well.
La2-xGdxHf2O7透明陶瓷的制备及性能
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