The Effect of Hydrothermal Synthesis Parameters on the Formation of Sodium Bismuth Titanate

IF 3.8 3区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Comments on Inorganic Chemistry Pub Date : 2020-09-23 DOI:10.1080/02603594.2020.1813728

E. A. Reshetnikova, I. V. Lisnevskaya, Ekaterina A. Zalyubovskaya, V. Butova, A. Soldatov

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引用次数: 4

Abstract

ABSTRACT We report the effect of various Bi:Ti ratios x:1 (x = 0.5–3) on the phase formation of sodium-bismuth titanate Na0.5Bi0.5TiO3 (NBT) during hydrothermal synthesis (230°С, 3 MPa, 96 h) from titanium oxide and bismuth hydroxide in 20 M NaOH solution. It was shown that single-phase ceramics with perovskite structure could be obtained at x = 0.5–0.9 using the hot-pressing technique (1025°С, 60 MPa, 1 h). At x = 1, hydrothermal synthesis results in single-phase samples, while, after sintering, the admixture of Na2Ti3O7 was detected. At x = 2 and 3, samples contained admixtures after hydrothermal synthesis. The x–value does not significantly affect the composition of perovskite-like products despite the excess of bismuth in the system. The chemical composition of the samples with x = 0.5–0.9 corresponds to the general formula Na0.60–0.69Bi0.40–0.31TiO2.9–2.81δ0.10–0.19 (where δ represents vacancies in oxygen sublattice). The Bi3+ content in the samples is underestimated due to the solubility of its hydroxide in a 20 M alkali solution. The properties of ceramics are not significantly affected by x values, and materials exhibit following average characteristics: electrical resistivity 1.3 × 109 Ohm∙cm, tanδ = 0.15, Кр = 0.1, d31 = 6.7 and d33 = 9.5 pC/N, g31 = 2.34 and g33 = 3 mV∙m/N.

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水热合成参数对钛酸铋钠生成的影响

摘要本文报道了不同Bi:Ti比x:1 (x = 0.5-3)对钛酸钠-铋酸钠Na0.5Bi0.5TiO3 (NBT)在20 M NaOH溶液中水热合成(230°С， 3 MPa, 96 h)相形成的影响。结果表明，在x = 0.5 ~ 0.9的温度下(1025°С， 60 MPa, 1 h)，热压技术可以得到具有钙钛矿结构的单相陶瓷。在x = 1时，水热合成得到单相样品，烧结后检测到Na2Ti3O7的掺入。在x = 2和3时，样品中含有水热合成后的外加剂。尽管系统中存在过量的铋，但x值对类钙钛矿产品的组成没有显著影响。x = 0.5 ~ 0.9时样品的化学组成为:Na0.60-0.69Bi0.40-0.31TiO2.9-2.81δ0.10-0.19(其中δ为氧亚晶格空位)。由于氢氧化物在20 M碱溶液中的溶解度，样品中的Bi3+含量被低估。陶瓷的性能不受x值的显著影响，材料的平均电阻率为1.3 × 109欧姆∙cm, tanδ = 0.15， Кр = 0.1, d31 = 6.7和d33 = 9.5 pC/N, g31 = 2.34和g33 = 3 mV∙m/N。

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来源期刊

Comments on Inorganic Chemistry 化学-无机化学与核化学

CiteScore

9.00

自引率

1.90%

发文量

审稿时长

>12 weeks

期刊介绍： Comments on Inorganic Chemistry is intended as a vehicle for authoritatively written critical discussions of inorganic chemistry research. We publish focused articles of any length that critique or comment upon new concepts, or which introduce new interpretations or developments of long-standing concepts. “Comments” may contain critical discussions of previously published work, or original research that critiques existing concepts or introduces novel concepts. Through the medium of “comments,” the Editors encourage authors in any area of inorganic chemistry - synthesis, structure, spectroscopy, kinetics and mechanisms, theory - to write about their interests in a manner that is both personal and pedagogical. Comments is an excellent platform for younger inorganic chemists whose research is not yet widely known to describe their work, and add to the spectrum of Comments’ author profiles, which includes many well-established inorganic chemists.