Probing disorder in cubic pyrochlore Bi1.5Zn1.0Nb1.5O7 (BZN) thin films

Singh, Jitendra Kumar; Krupanidhi, S. B.

doi:10.1016/j.ssc.2010.09.030

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…The plots are well fitted by a single parallel RC element (inset of Fig. 5) where R and C belong to bulk resistance and capacitance, respectively [36][37][38]. The measured parameters are listed in Table 2.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Synthesis, structure and electrical properties of Mg-, Ni-codoped bismuth niobates

Королева¹,

Пийр²,

Истомина³

2017

Chim.Tech.Acta

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Synthesis, structure and electrical properties of Mg-, Ni-codoped bismuth niobatesMg-, Ni-codoped bismuth niobates Bi 1.6 Mg 0.8-x Ni x Nb 1.6 O 7-δ (x = 0; 0.2; 0.4; 0.6; 0.8) were obtained by conventional solid-state reaction method. It was shown that the Mg atoms are distributed at the Nb sites while the Ni atoms are distributed over the Bi-and the Nb-sites, according to the results of comparison of pycnometric and X-ray density of the Bi 1.6 Mg 0.4 Ni 0.4 Nb 1.6 O 7-δ pyrochlore. In this case, about 15-20% of the vacancies are formed at the Bi sites. The obtained compounds are stable up to their melting point based on the DSC analysis data. Real dielectric permittivity ε' of the Bi 1.6 Mg 0.8-x Ni x Nb 1.6 O 7-δ samples decreases from 80 to 65 with the temperature decrease from 25 to 700 °C and practically does not depend on frequency in the range of 1-1000 kHz. Oxides Bi 1.6 Mg 0.8-x Ni x Nb 1.6 O 7-δ behave like insulators up to 280 °C, their conductivity increases with temperature (E a,dc ≈ 1.3 eV, dc) and with the Ni content at a given temperature.

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Section: Electrical Propertiesmentioning

confidence: 99%

Synthesis, structure and electrical properties of Mg-, Ni-codoped bismuth niobates

Королева¹,

Пийр²,

Истомина³

2017

Chim.Tech.Acta

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“…There are two basic phases in the BZN system: cubic structure Bi 1.5 ZnNb 1.5 O 7 ( phase) and monoclinic structure Bi 2 Zn 2/3 Nb 4/3 O 7 ( phase). Several studies have reported synthesis of various forms of cubic BZN compounds using a variety of synthetic techniques [2][3][4]. Conventional solid state reaction is the most commonly employed synthesis strategy to prepare both thin film and bulk crystal BZN materials [5,6].…”

Section: Introductionmentioning

confidence: 99%

Sol‐Gel Synthesis and Characterization of Cubic Bismuth Zinc Niobium Oxide Nanopowders

Perenlei

Talbot

Martens

2014

Journal of Nanomaterials

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Bismuth zinc niobium oxide (BZN) was successfully synthesized by a diol-based sol-gel reaction utilizing metal acetate and alkoxide precursors. Thermal analysis of a liquid suspension of precursors suggests that the majority of organic precursors decompose at temperatures up to 150 ∘ C, and organic free powders form above 350 ∘ C. The experimental results indicate that a homogeneous gel is obtained at about 200 ∘ C and then converts to a mixture of intermediate oxides at 350-400 ∘ C. Finally, single-phased BZN powders are obtained between 500 and 900 ∘ C. The degree of chemical homogeneity as determined by X-ray diffraction and EDS mapping is consistent throughout the samples. Elemental analysis indicates that the atomic ratio of metals closely matches a Bi 1.5 ZnNb 1.5 O 7 composition. Crystallite sizes of the BZN powders calculated from the Scherrer equation are about 33-98 nm for the samples prepared at 500-700 ∘ C, respectively. The particle and crystallite sizes increase with increased sintering temperature. The estimated band gap of the BZN nanopowders from optical analysis is about 2.60-2.75 eV at 500-600 ∘ C. The observed phase formations and measured results in this study were compared with those of previous reports.

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