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

基金：

英国科学技术设施理事会;

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.

引用

页数：11

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