Structural, characterization and spectroscopic properties of NH₄YbP₂O₇ micro-powders

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• 作者：Jalila Ché ; kir-Mzali ; ^{jalila.chekir@yahoo.fr" class="auth_mail" title="E-mail the corresponding author} ; Karima Horchani-Naifer ; Mokhtar Fé ; rid
• 关键词：Ytterbium ; Diphosphate ; X-ray diffraction ; Infrared spectroscopy ; Raman spectroscopy ; Particle-size distribution ; Band gap ; Spectroscopic property
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：127
• 期：14
• 页码：5622-5630
• 全文大小：2249 K

文摘

Powders of NH₄YbP₂O₇ diphosphate have been grown using the flux method. This compound was found to be isotopic to RbYP₂O₇. It crystallizes in the monoclinic space group P2₁/c with unit cell parameters: a = 7.7038(6) Å; b = 19.924(7) Å; c = 8.625(2) Å and β = 105.239(5)°. Thermal treatment of NH₄YbP₂O₇ up to 550 °C allowed us to obtain Yb(PO₃)₃ triphosphate. Powder X-ray diffraction, vibrational spectroscopy and particle-size distribution have been used to identify these materials. Spectroscopic properties of the Yb³⁺ in both compounds NH₄YbP₂O₇ and Yb(PO₃)₃, at room temperature (RT) have been carried out. Absorption spectra of Yb³⁺ ion in both phosphates have been registered. A broad band located between 970 nm and 1060 nm relative to the Stark levels of the Yb 4f configuration is observed. The excitation and emission spectra in UV–vis and IR range have been registered. Calcinations effect on the PL measurements, have been observed. They show that the position of the charge transfer band (CTB) depends on the host lattices.