Structure and optical properties of KLa9(GeO4)(6)O-2 and KLa8.37Eu0.63(GeO4)(6)O-2 / Lipina Olga A.,Surat Ludmila L.,Tyutyunnik Alexander P.,Enyashin Andrey N.,Chufarov Alexander Yu.,Zubkov Vladimir G. // CHEMICAL PHYSICS LETTERS. - 2017. - V. 667, l. . - P. 9-14.

ISSN/EISSN:

0009-2614 / 1873-4448

Type:

Article

Abstract:

New KLa9(GeO4)(6)O-2 and KLa8.37Eu0.63(GeO4)(6)O-2 germanates with the apatite structure type (space group P6(3)/m, Z = 1) have been synthesized by the sol-gel method using ethylenediaminetetraacetic acid as a precursor and characterized by powder X-ray diffraction, scanning electron microscopy and diffuse reflectance spectroscopy. Density functional theory calculations reveal that KLa9(GeO4)(6)O-2 is a direct bandgap material, and near-UV excitation leads to the electronic transitions from the O2p- orbitals to the Lad- and K4s- states. Photoluminescence measurements of the Eu3+-doped sample indicate emission in the visible spectral range corresponding to the characteristic transitions from the excited D-5(0) and D-5(1) levels in europium ion. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

Germanates; Rare earth elements; Density functional theory; Diffuse reflectance spectroscopy; Luminescence BOND-VALENCE PARAMETERS; RARE-EARTH IONS; CRYSTAL; APATITE; SILICATE; YB; NALA9(GEO4)(6)O-2; LUMINESCENCE; INTENSITIES; SPECTRA

DOI:

10.1016/j.cplett.2016.11.021

Web of Science ID:

ISI:000390659100003

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-4448
Keywords-Plus	BOND-VALENCE PARAMETERS; RARE-EARTH IONS; CRYSTAL; APATITE; SILICATE; YB; NALA9(GEO4)(6)O-2; LUMINESCENCE; INTENSITIES; SPECTRA
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Atomic, Molecular \& Chemical
Author-Email	LipinaOlgaA@yandex.ru
ResearcherID-Numbers	Enyashin, Andrey/A-8247-2017
ORCID-Numbers	Enyashin, Andrey/0000-0001-6195-7971
Funding-Acknowledgement	RSF {[}16-13-10111]
Funding-Text	This work was supported by RSF (Grant No. 16-13-10111). The structural studies were carried out at the multiple-access center for X-ray structure analysis at the Institute of Solid State Chemistry, UB RAS (Ekaterinburg, Russia).
Number-of-Cited-References	43
Usage-Count-Since-2013	3
Journal-ISO	Chem. Phys. Lett.
Doc-Delivery-Number	EF9OI