Revealing the oxidation number and local coordination of uranium in Nd2Zr2O7 pyrochlore: A photoluminescence study

被引：36

作者：

Gupta, Santosh K. ^{[1
]}

Reghukumar, C. ^{[2
]}

Keskar, M. ^{[3
]}

Kadam, R. M. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Div Radiochem, Bombay 400085, Maharashtra, India

[2] Visva Bharati, Integrated Sci Educ & Res Ctr, Santini Ketan, W Bengal, India

[3] Bhabha Atom Res Ctr, Div Fuel Chem, Bombay 400085, Maharashtra, India

来源：

JOURNAL OF LUMINESCENCE | 2016年 / 177卷

关键词：

Nd2Zr2O7; Uranium; Photoluminescence; Annealing temperature; Lifetime; THERMALLY STIMULATED LUMINESCENCE; FLUORESCENCE; MATRIX; SPECTROSCOPY; SPECIATION; RESONANCE; SPECTRUM; STATE; U5+; LN;

D O I：

10.1016/j.jlumin.2016.04.031

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Uranium doped Nd2Zr2O7 is synthesized at 800 degrees C (NUZO-800) using gel-combustion method and characterized using X-ray diffraction, scanning electron microscopy (SEM), X-ray photoelectron microscopy (XPS) and time-resolved photoluminescence (TRPL). As prepared sample was annealed further at 900, 1000, 1100 and 1200 degrees C leading to increase in the size of the particle and the effect of same has been investigated on the photophysical properties of NUZO. Based on excitation and emission spectroscopy it was inferred that uranium stabilizes as +6 oxidation state in the form of UO66-. XPS measurement also establishes +6 oxidation state of uranium in Nd2Zr2O7. Both emission intensity and photoluminescence (PL) decay time increases with increase in temperature till 1000 degrees C beyond which lifetime saturates whereas emission intensity decreases. The decay curve shows two different chemical environments for uranate ion in Nd2Zr2O7 pyrochlore matrix. (c) 2016 Elsevier B.V. All rights reserved.

引用

页码：166 / 171

页数：6

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