2021
DOI: 10.1021/acs.inorgchem.1c00007
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Thermal Expansion, XPS Spectra, and Structural and Electrical Properties of a New Bi2NiTa2O9 Pyrochlore

Abstract: A phase-pure nickel bismuth tantalate with pyrochlore structure was synthesized by a solid-phase synthesis method for the first time. The crystal structure of pyrochlore (refined formula Bi 1.58 Ni 0.60 Ta 1.40 O 7 , sp. gr. Fd-3m, a = 10.5343 Å, Z = 8) was clarified by the Rietveld method on the basis of X-ray powder diffraction (XRD) data. The crystallite size determined by the Scherrer method is ∼46 nm. The sample has an atypical pink-purple color. The electronic state of the atoms was investigated by XPS. … Show more

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Cited by 38 publications
(20 citation statements)
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“…One of the dissociation products, according to the results of high-temperature X-ray diffraction, is copper (II) (magnesium) tantalate (MgTa 2 O 6 ) CuTa 2 O 6 (Figures –). It is worth noting that this is similar to the thermal behavior of bismuth–magnesium tantalate and its solid solutions Bi 1.6 Mg 0.8– x Cu x Ta 1.6 O 7.2−Δ (M–Ni, Cu) . All are characterized by decomposition at practically the same temperature (1080 °C), regardless of the concentration of the dopant, and the release of the same type of dissociation productMTa 2 O 6 (M–Mg, Ni, Cu), regardless of the nature of the dopant.…”
Section: Results and Discussionsupporting
confidence: 69%
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“…One of the dissociation products, according to the results of high-temperature X-ray diffraction, is copper (II) (magnesium) tantalate (MgTa 2 O 6 ) CuTa 2 O 6 (Figures –). It is worth noting that this is similar to the thermal behavior of bismuth–magnesium tantalate and its solid solutions Bi 1.6 Mg 0.8– x Cu x Ta 1.6 O 7.2−Δ (M–Ni, Cu) . All are characterized by decomposition at practically the same temperature (1080 °C), regardless of the concentration of the dopant, and the release of the same type of dissociation productMTa 2 O 6 (M–Mg, Ni, Cu), regardless of the nature of the dopant.…”
Section: Results and Discussionsupporting
confidence: 69%
“…According to the structure refinement results, the 6-coordinated B-site cations form undistorted (Ta/Cu/Mg)­O 6 octahedra with the metal–oxygen bond length of ∼2.001 Å (Table ). The BiO 8 polyhedra are, however, more distorted with respect to Ni-doped bismuth pyrochlores . This asymmetry may indicate Cu­(I) incorporation into the bismuth sites.…”
Section: Results and Discussionmentioning
confidence: 90%
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“…X-ray diffraction (XRD) analysis confirmed the formation of continuous solid solution series in the pseudobinary system Bi 1.4 Mg 0.7 Ta 1.4 O 6.3 –Bi 1.4 Ni 0.7 Ta 1.4 O 6.3 (Figures and ). It should be noted that the data on Mg-free end member, Bi 1.4 Ni 0.7 Ta 1.4 O 6.3 , were reported in . All Bi 1.4 (Mg 1– x Ni x ) 0.7 Ta 1.4 O 6.3 ( x = 0.3, 0.5, 0.7) are single phase and have a cubic pyrochlore structure.…”
Section: Resultsmentioning
confidence: 95%
“…The oxidation states of Ni 2p 3/2 and 2p 1/2 at 860 eV and 878 eV, respectively, with their two satellite peaks and Ta 4d 5/2 , 4d 3/2 , 4f 7/2 , and 4f 5/2 at 234, 245, 30, and 31 eV, respectively, confirm perfect crystallinity with the molecular fingerprint. 39,40 The shapes of peaks of Ta atoms indicate the same charge states without any distortion and splitting of the peaks. However, their positions slightly shifted toward lower energies, which is stabilized by the peak shifting of Ni 2p 3/2 and 2p 1/2 toward higher energies.…”
Section: ■ Results and Discussionmentioning
confidence: 95%