Structure transformation and remarkable site-distribution modulation of Eu3+ ions in CaMoO4 : Eu3+ nanocrystals under high pressure

Zhi Zhao; Zhilei Sui; Xiantao Wei; Jian Zuo; Xianwen Zhang; Rucheng Dai; Zengming Zhang; Zejun Ding

doi:10.1039/C5CE01580D

Structure transformation and remarkable site-distribution modulation of Eu³⁺ ions in CaMoO₄ : Eu³⁺ nanocrystals under high pressure†

Zhi Zhao,^a Zhilei Sui,^b Xiantao Wei,^c Jian Zuo,^a Xianwen Zhang,*^d Rucheng Dai,^c Zengming Zhang*^c and Zejun Ding^ab

Author affiliations

* Corresponding authors

^a Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China

^b Department of Physics, University of Science and Technology of China, Hefei, China

^c The Center of Physics Experiment, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
E-mail: zzm@ustc.edu.cn

^d Institute of Advanced Energy Technology and Equipment, Hefei University of Technology, Hefei, China
E-mail: xianwen.zhang@hfut.edu.cn

Abstract

High-pressure behaviors of scheelite-type CaMoO₄ : Eu³⁺ nanocrystals with an average size of 30 nm have been investigated by using Raman and luminescence spectroscopy at pressures of up to 21 GPa in a diamond anvil cell (DAC). Under the loading of pressure, the softening of the external T(B_g) mode before 10.8 GPa and the appearance of new Raman peaks suggest a phase transformation around this pressure from scheelite to fergusonite structure. When the pressure is released, the scheelite phase recovers due to the small difference in bond strength between scheelite and fergusonite structures. The transformation pressure is slightly enhanced in nanosized CaMoO₄ : Eu³⁺ as compared to the bulk due to the difference in surface energy between the two samples of different sizes. Moreover, it is identified that the Eu³⁺ ions occupy both the bulk and the surface sites in CaMoO₄ : Eu³⁺ nanocrystals at ambient pressure by the site-selective excitation, emission and lifetime spectra. As an effective site probe, the red-to-orange luminescence intensity ratio of Eu³⁺ ions, I(⁵D₀ → ⁷F₂)/I(⁵D₀ → ⁷F₁), is found to exhibit remarkable changes with pressure, which indicates a large variation of the distribution and the local symmetry of Eu³⁺ ions.

Supplementary files

Article information

DOI: https://doi.org/10.1039/C5CE01580D
Article type: Paper
Submitted: 06 Aug 2015
Accepted: 15 Sep 2015
First published: 15 Sep 2015

Download Citation

CrystEngComm, 2015,17, 7905-7914

Permissions

Request permissions

Structure transformation and remarkable site-distribution modulation of Eu³⁺ ions in CaMoO₄ : Eu³⁺ nanocrystals under high pressure

Z. Zhao, Z. Sui, X. Wei, J. Zuo, X. Zhang, R. Dai, Z. Zhang and Z. Ding, CrystEngComm, 2015, 17, 7905 DOI: 10.1039/C5CE01580D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

CrystEngComm

Structure transformation and remarkable site-distribution modulation of Eu³⁺ ions in CaMoO₄ : Eu³⁺ nanocrystals under high pressure†

Abstract

Supplementary files

Article information

Download Citation

Permissions

Structure transformation and remarkable site-distribution modulation of Eu³⁺ ions in CaMoO₄ : Eu³⁺ nanocrystals under high pressure

Social activity

Search articles by author

Spotlight

Advertisements

CrystEngComm