Issue 79, 2017

High-pressure synthesis, crystal structure and photoluminescence properties of a new terbium silicate: Na2Tb1.08Ca2.92Si6O18H0.8

Abstract

The crystal properties of a terbium silicate Na2Tb1.08Ca2.92Si6O18H0.8 synthesized at 1 GPa and 800 °C using a piston-cylinder apparatus is reported. Our single-crystal X-ray analysis shows that this new compound is triclinic with the space group [P with combining macron]1 (Z = 1), and its unit-cell parameters are a = 7.056(3) Å, b = 7.075(3) Å, c = 8.029(3) Å, α = 102.381(5)°, β = 95.387(6)°, γ = 90.552(6)°, and V = 389.6(2) Å3. This structure consists of octahedral double chains of the compositions [Ca0.875Tb0.125O6] and [Ca0.585Tb0.415O6]. The double chains are linked by tetrasilicate chains via vertex oxygen atoms to form a 3D framework with 6-membered (2 octahedra and 4 tetrahedra) ring channels along the b-axis where the Na+ cations locate. The luminescence properties of the Na2Tb1.08Ca2.92Si6O18H0.8 phase are also investigated. This phase, with most of its Tb in 3+, emits mainly from one transition, 5D47F5 (542 and 552 nm). The room temperature fluorescence decay curves are fit well by an exponential function, yielding a lifetime value of about 2.498(7) ms.

Graphical abstract: High-pressure synthesis, crystal structure and photoluminescence properties of a new terbium silicate: Na2Tb1.08Ca2.92Si6O18H0.8

Supplementary files

Article information

Article type
Review Article
Submitted
13 9 2017
Accepted
23 10 2017
First published
27 10 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 50195-50199

High-pressure synthesis, crystal structure and photoluminescence properties of a new terbium silicate: Na2Tb1.08Ca2.92Si6O18H0.8

X. Bao, X. Liu and X. Liu, RSC Adv., 2017, 7, 50195 DOI: 10.1039/C7RA10182A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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