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 Sep 2017
Accepted
23 Okt 2017
First published
27 Okt 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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