Thermally-Induced Reentrant Order-Disorder-Order Transitions in ALa9(GeO4)6O2 Apatites

被引：0
|
作者：
Chufarov, Alexander Yu. [1 ]
Tyutyunnik, Alexander P. [1 ]
Tarakina, Nadezda V. [2 ]
Fortes, A. Dominic [3 ]
Melkozerova, Marina A. [1 ]
Enyashin, Andrey N. [1 ]
Lipina, Olga A. [1 ]
Baklanova, Yana V. [1 ]
Kiryakov, Arseny N. [4 ]
Surat, Ludmila L. [1 ]
Zubkov, Vladimir G. [1 ]
机构：
[1] Inst Solid State Chem, UB RAS, Pervomaiskaya Str 91, Ekaterinburg 620990, Russia
[2] Max Planck Inst Colloids & Interfaces, Muhlenberg 1, D-14476 Potsdam, Germany
[3] Rutherford Appleton Lab, ISIS Facil, Harwell Sci & Innovat Campus, Chilton OX11 0QX, Oxfordshire, England
[4] Ural Fed Univ, Mira Str 19, Ekaterinburg 620062, Russia
来源：
ADVANCED OPTICAL MATERIALS | 2024年 / 12卷 / 32期
关键词：
germanium; luminescence; reentrant transitions; solid-state structures; X-ray and neutron diffraction; POWDER NEUTRON-DIFFRACTION; ION CONDUCTION MECHANISM; SINGLE-CRYSTAL GROWTH; LUMINESCENCE PROPERTIES; ELECTRICAL-PROPERTIES; OPTICAL-PROPERTIES; OXIDE; ND; INTENSITIES; TRANSPORT;
D O I：
10.1002/adom.202401520
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Oxyapatites A(10)(GeO4)(6)O-2 (A - alkaline, rare-earth elements) are considered promising materials for applications in solid-state lighting and non-contact thermometry. The temperature dynamics of the oxygen sublattice have a crucial influence on the luminescent properties of these optical hosts. Here, the structural evolution with temperature of germanates with the general formula ALa(9)(GeO4)(6)O-2 (A - Li, Na, K, Rb) is investigated, using X-ray and neutron powder diffraction methods. These compounds crystallize in space-group P6(3)/m. NPD experiments helped to determine the oxygen and alkaline metal positions. Thermally-induced reentrant structural transitions relating to the oxygen in the apatite channel are discovered for the first time. In the example of Eu-doped RbLa9(GeO4)(6)O(2 )and KLa9(GeO4)(6)O-2, it is demonstrated that the luminescence of the Eu3+ ion is influenced by small changes in the crystal structure.
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页数：11
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