XPS and NEXAFS Studies of Zn-Doped Bismuth Iron Tantalate Pyrochlore

被引：1
|
作者：
Nekipelov, Sergey V. [1 ]
Sivkov, Victor N. [1 ]
Sivkov, Danil V. [1 ]
Lebedev, Alexey M. [2 ]
Chumakov, Ratibor G. [2 ]
Koroleva, Aleksandra V. [3 ]
Makeev, Boris A. [4 ]
Zhuk, Nadezhda A. [5 ]
机构：
[1] Komi Sci Ctr UB RAS, Inst Phys & Math, Oplesnina St 4, Syktyvkar 167982, Russia
[2] Kurchatov Inst, Natl Res Ctr, 1 Akad Kurchatova Sq, Moscow 123182, Russia
[3] St Petersburg State Univ, Fac Phys, Univ Emb 7-9, St Petersburg 199034, Russia
[4] Komi Sci Ctr UB RAS, Inst Geol, Pervomaiskaya St 48, Syktyvkar 167982, Russia
[5] Syktyvkar State Univ, Inst Nat Sci, Oktyabrsky Prospect 55, Syktyvkar 167001, Russia
来源：
INORGANICS | 2023年 / 11卷 / 07期
关键词：
pyrochlore; Zn-doping; BiTaO4; XPS and NEXAFS spectroscopy; SUBSOLIDUS PHASE-EQUILIBRIA; SPECTROSCOPIC CHARACTERIZATION; MAGNETIC CHARACTERIZATION; ELECTRICAL-PROPERTIES; DIELECTRIC-PROPERTIES; TRANSITION-METALS; SYSTEM; OXIDATION; TRENDS; OXIDES;
D O I：
10.3390/inorganics11070285
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The effect of Zn-doping on the phase composition and optical properties of the Bi2ZnxFe1-xTa2O9.5-& UDelta; (x = 0.3, 0.5, 0.7) was studied. XRD data showed that the samples crystallize in the structural type of pyrochlore (sp. gr.Fd-3m). For all the samples, an admixture of bismuth orthotantalate & beta;-BiTaO4 triclinic modification up to 22.5 wt.% is observed. The content of & beta;-BiTaO4 increases with zinc doping. The unit cell parameter of the pyrochlore phase rises from 10.4878 (x = 0.3) to 10.5154 & ANGS; (x = 0.7). The samples are characterized by a porous microstructure with indistinct grain boundaries. Zinc oxide has a sintering effect on ceramics. The charge state of the ions in Bi2ZnxFe1-xTa2O9.5-& UDelta; was investigated by X-ray spectroscopy. NEXAFS and XPS data show that zinc doping does not change the oxidation degree of iron and bismuth ions in pyrochlore. The ions are in the charge states Bi(+3), Fe(+3), Zn(+2). In the Ta4fspectrum, an energy shift of the absorption band towards lower energies by & UDelta;E = 0.5 eV is observed, which is typical for tantalum ions with an effective charge of (+5-& delta;). With the increase of x(Zn), the Bi 4f(7/2) and Bi 4f(5/2) bands are observed to shift to lower energies due to the distribution of some Zn(II) ions in the bismuth position.
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页数：11
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