Synthesis of a mixed-valent europium(II, III)-borate and its optical and magnetic behavior

被引：0
|
作者：
Gatterdam, Maximilian [1 ]
Kannengiesser, Nils [2 ]
Albert, Barbara [1 ]
Glaum, Robert [2 ]
机构：
[1] Tech Univ Darmstadt, Eduard Zintl Inst Inorgan & Phys Chem, Alarich Weiss Str 12, D-64287 Darmstadt, Germany
[2] Rheinische Friedrich Wilhelms Univ, Inst Inorgan Chem, Gerhard Domagk Str 1, D-53121 Bonn, Germany
来源：
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2022年 / 648卷 / 24期
关键词：
Borates; Optical properties; Lanthanoides; mixed-valency; CRYSTAL-STRUCTURE; DIVALENT-EUROPIUM; LUMINESCENCE; PARAMETERS;
D O I：
10.1002/zaac.202200040
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The mixed-valent, europium borate Eu-5(BO3)(4) was synthesized from Eu2B2O5 and EuB2O4. Its structure was refined by Rietveld analysis. Eu-5(BO3)(4) crystallizes in space group Pnma (a=2229.77(2) pm, b=1599.91(2) pm, and c=877.75(1) pm) and was found to be isostructural with Eu-5(BO2.51N0.49)(4). Powder reflectance spectra (UV/vis/NIR) and magnetic susceptibility data of Eu-5(BO3)(4) and of the reference compounds (EuB4O7)-B-II and (EuBO3)-B-III were measured. The spectrum of the mixed-valent europium(II, III) borate shows the F-7(0)-> F-7(6) transition of the Eu3+ ion and the intervalence charge transfer Eu2+-> Eu3+. The experimental Bohr magneton number of Eu-5(BO3)(4), mu(obs)/mu(B)=14.90, agrees well to mu(calc)/mu(B) for a combination of three Eu2+ and two Eu3+ per formula.
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页数：6
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