2025年1月5日 · In this work, phase-pure Cu-Cr codoped bismuth tantalate pyrochlore with equivalent copper and chromium content was synthesized, based on X-ray spectroscopy data (NEXAFS, XPS), the charge state of all cations was analyzed and the electrical properties of the ceramics were studied.

2022年5月15日 · The crystal structure and the thermal behavior of Fe-doped bismuth tantalate at high-temperature were investigated by the high-temperature x-ray diffractometry (HT-XRD) using a Rigaku Ultima IV X-ray diffractometer (CoK α radiation, 40 kV/30 mA, Bragg-Brentano geometry, PSD D-Tex Ultra) with a thermo-attachment in the range −170 ÷ 1200 °C ...

2024年6月15日 · In current work we demonstrate the solid-phase synthesis of phase-pure Zn, Cr codoped bismuth tantalate pyrochlores and report on the electronic state of chromium ions using X-ray photoelectron spectroscopy (XPS) and near …

Cu, Mg Codoped Bismuth Tantalate Pyrochlores: Crystal Structure, XPS Spectra, Thermal Expansion, and Electrical Properties. Cite this: Inorg. Chem. 2022, 61, 10, 4270–4282. The pyrochlore-type solid-solution formation in a Bi 1.6 Mg 0.8–x Cu x Ta 1.6 O 7.2−Δ system, synthesized for the first time, is observed at x ≤ 0.56.

2023年7月2日 · In our work, we demonstrated the possibility of formation of Zn, Fe codoped bismuth tantalate pyrochlores and investigated the influence of zinc ions on the structure and charge state of the ions in the pyrochlore.

2022年12月24日 · The obtained XPS spectra of bismuth–magnesium tantalate, Mg,Fe-codoped bismuth tantalate (on the example of a composition with x = 0.5) and corresponding oxides are shown in Figure 6a–d: XPS spectra in a wide energy range of binding energies (20–1400 eV) and spectral dependences in the region of Bi4f-, Bi5d-, Ta4f-, Ta4d-, Mg1s and Fe2p ...

As part of our work, we studied the electronic state of manganese ions in Mg(Zn), Mn codoped bismuth tantalate pyrochlores using NEXAFS and XPS spectroscopy. The influence of zinc and magnesium and the degree of substitution of Ta(V) ions on the proportion of oxidized manganese ions in pyrochlores has been established.

2024年4月3日 · Co doped bismuth magnesium tantalate with a pyrochlore structure (sp. gr. Fd-3m) was synthesized for the first time using the standard ceramic method. Single phase Bi2Mg1−xCoxTa2O9 samples were...

2021年3月23日 · Ni-doped bismuth tantalate refers to dielectrics and exhibits a moderately high dielectric constant, ∼32, and low dielectric losses, ∼2 × 10 –3 at 1 MHz and ∼30 °C. Above 300 °C, the dielectric losses and dielectric permittivity increase in the low-frequency region due to the activation of oxygen anions.

2019年4月15日 · In this paper, we report on the preparation of the SmNbO 4 (SNO) and tantalate SmTaO 4 (STO) precursors by sol-gel method from Nb and Ta-tartrate solutions at the same experimental conditions. XPS measurements have been done in order to investigate the chemical composition and bonding state of the SNO and STO phosphor powders.