OH defects in synthetic xenotime
OH defects in synthetic xenotime
复制标题
合成磷钇矿中的 OH 缺陷
DOI：
10.1127/ejm/2016/0028-2526
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发表时间：
2016
影响因子：
2.1
通讯作者：
M
中科院分区：
文献类型：
--
作者：
Abe;T.;Kuribayashi;T. and Nakamura;M
测量了含氢杂多酸(YPO4)的偏振红外光谱，以获得其OH缺陷的信息。样品合成是在1.0 Gpa下，使用活塞-圆柱体装置在水饱和条件下进行的。通过以10℃/h的速率将温度从12 0 0℃降低到80 0℃，获得了长达30 0μm的单晶。在3302 cm−1处观察到明显的OH伸缩振动带，摩尔吸光系数为111217 L−1 cm−2，估算出样品中H2O的浓度为20±10ppm。OH带表现出垂直于c轴的强红外吸收和平行于c轴的弱吸收。根据静电的考虑，假设Y3+或P5+空位的存在，估计了O-H键的可能取向。我们认为在合成的杂多酸中，OH的掺入机制是由Y3+空位(YY×↔V‴Y+3Hi·)控制的。
The polarized infrared spectra of hydrogen-containing xenotime (YPO4) were measured to obtain information on its OH defects. Sample syntheses were conducted at 1.0 GPa using a piston-cylinder apparatus under water-saturated conditions. By lowering the temperature at a rate of 10°C/h from 1200 to 800 °C, xenotime single crystals up to ~300 μm in length were obtained. A sharp OH stretching vibrational band was observed at 3302 cm−1. Using a molar absorption coefficient of 111 217 L mol−1cm−2, the H2O concentration in the sample was estimated as 20±10 ppm. The OH band showed strong infrared absorption perpendicular to thec-axis and weak absorption parallel to thec-axis. According to electrostatic considerations and assuming the presence of Y3+or P5+vacancy, possible orientations of the O–H bonds were estimated. We propose that the OH incorporation mechanism in synthetic xenotime is controlled by Y3+vacancy (YY×↔V‴Y+3Hi•).