Sol–gel-hydrothermal synthesis and sintering of K0.5Bi0.5TiO3 nanowires

Hou, Lei; Hou, Yudong; Song, Xuemei; Zhu, Mankang; Wang, Hao; Yan, Hui

doi:10.1016/j.materresbull.2005.12.010

Cited by 46 publications

(24 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with nanowires synthesized by the sol-gelhydrothermal process, the KBT powders synthesized at 700°C by the conventional sol-gel method consist of the aggregated spherical particles. The detailed morphology characterization can refer to the literatures [55][56][57]. The above results highlight the particulate morphology of the crystallized KBT particles in the sol-gel-hydrothermal process.…”

Section: Introductionsupporting

confidence: 53%

“…They found that when synthesized via a conventional soft chemical route or hydrothermal method, KTN tends to grow uniformly along three major directions, leading to the formation of nanopowders; while using PVA as polymer additives, the [001]-oriented nanorods were observed and the preferred crystallographic orientation of the nanorods can even be controllable by using different types of polymers. In our former work, without using gel precursors, the hydrothermal reaction can only result in the formation of KBT particles with cubic shape [63]. Considering gel precursor is one kind of polymer, it is nature to speculate that the gel precursor containing Ti-O chain played an important role as PVA in the hydrothermal formation of the Bi-based complex perovskite nanowires.…”

Section: The Formation Mechanism Of Bi-based Complex Perovskite Seriementioning

confidence: 94%

“…As we known, sol-gel technique is a conventional preparation method, which could realize evenly mixed gelatin, while hydrothermal technique, in which reactions could take place under elevated pressure and moderated temperature, has many advantages over other manufacture techniques, such as morphology, purity, and lowering down the reaction temperature considerately. The sol-gelhydrothermal method gives a double advantage of both sol-gel and hydrothermal syntheses and became attractive in the last decade for the possibly of producing highly crystallized and well dispersed ceramic powders at relative low temperature [52][53][54][55]. In our recent series works, we have found that the sol-gel-hydrothermal method can also be developed to direct generation of ferroelectric nanowires.…”

Section: Introductionmentioning

confidence: 99%

“…As noted, we found it to be a simple, readily scaleable (in terms of grams) chemical reaction without using expensive apparatus. The typical experimental procedures include [55]: (1) sol-gel preparation: according to the stoichiometric ratio of NBT, KBT, KBT-BT and KBT-NBT, the raw materials of bismuth, sodium, potassium and barium in the form of nitrate or acetate were weighted and then introduced into the solution of tetrabutyl titanate in ethanol. In this step, the control of PH value is important to obtain homogeneous sol.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Lead-free Bi-based complex perovskite nanowires: Sol–gel-hydrothermal processing and the densification behavior

et al. 2010

Self Cite

View full text Add to dashboard Cite

One dimensional ferroelectric nanostructure is noteworthy for their size-dependent dielectric, piezoelectric, and electro-optic properties with corresponding applications in smart devices such as transducers, actuators, and high-k dielectrics at the nanoscale. Due to their extremely small size and anisotropy, the control of nucleation and growth of one dimensional nanostructure materials is still a big challenge. Sol-gel-hydrothermal chemistry combines both the merits of sol-gel and hydrothermal technique, which offers a very useful tool for low-temperature synthesis of the ferroelectric nanowires. In this paper, we will review recent works devoted to the synthesis of Bi-based complex perovskite nanowires, i.e. Na 0.5 Bi 0.5 TiO 3 , K 0.5 Bi 0.5 TiO 3 , (K 0.5 Bi 0.5 ) 0.4 Ba 0.6 TiO 3 and (Na 0.8 K 0.2 ) 0.5 Bi 0.5 TiO 3 systems. We will focus on the formation mechanism and morphology evolution of nanowires prepared in sol-gelhydrothermal process. Moreover, due to the good sinterability of the nanowires, the high-densified single-phase ceramic can be fabricated even by a conventional sintering process.

show abstract

Section: Introductionsupporting

confidence: 53%

Section: The Formation Mechanism Of Bi-based Complex Perovskite Seriementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lead-free Bi-based complex perovskite nanowires: Sol–gel-hydrothermal processing and the densification behavior

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…As a method to prepare oxide materials at moderate condition, the gel-hydrothermal technique combines the advantage of both sol-gel and hydrothermal synthesis and is a promising method to produce well dispersed and homogeneous nano-sized materials. 18 Pure phase and LTO nanoparticles (ca. 20 nm) are obtained at hydrothermal temperature as low as 180 ℃ and subsequent calcination treatment at 500 ℃ for just 2 h. Excellent high rate performance of the prepared LTO nanoparticles in lithium batteries is presented.…”

Section: Introductionmentioning

confidence: 99%

Li₄Ti₅O₁₂ Nanoparticles Prepared with Gel‐hydrothermal Process as a High Performance Anode Material for Li‐ion Batteries

et al. 2010

View full text Add to dashboard Cite

Li 4 Ti 5 O 12 (LTO) nanoparticles were prepared by gel-hydrothermal process and subsequent calcination treatment. Calcination treatment led to structural water removal, decomposition of organics and primary formation of LTO. The formation temperature of spinel LTO nanoparticles was lower than that of bulk materials counterpart prepared by solid-state reaction or by sol-gel processing. Based on the thermal gravimetric analysis (TG) and differential thermal gravimetric (DTG), samples calcined at different temperatures (350, 500 and 700 ℃) were characterized by X-ray diffraction (XRD), field emitting scanning electron microscopy (FESEM), transmission electron microscopy (TEM), cyclic voltammogram and charge-discharge cycling tests. A phase transition during the calcination process was observed from the XRD patterns. And the sample calcined at 500 ℃ had a distribution of diameters around 20 nm and exhibited large capacity and good high rate capability. The well reversible cyclic voltammetric results of both electrodes indicated enhanced electrochemical kinetics for lithium insertion. It was found that the Li 4 Ti 5 O 12 anode material prepared through gel-hydrothermal process, when being cycled at 8 C, could preserve 76.6% of the capacity at 0.3 C. Meanwhile, the discharge capacity can reach up to 160.3 mAh•g -1 even after 100 cycles at 1 C, close to the theoretical capacity of 175 mAh•g -1 . The gel-hydrothermal method seemed to be a promising method to synthesize LTO nanoparticles with good application in lithium ion batteries and electrochemical cells.

show abstract

(Na_0.8K_0.2)_0.5Bi_0.5TiO₃Nanowires: Low‐Temperature Sol–Gel–Hydrothermal Synthesis and Densification

Hou¹,

Zhang²,

Zhu³

et al. 2009

Progress in Nanotechnology

View full text Add to dashboard Cite

The sol-gel-bydrothermal processing of (Nao.sKo.z)o.sBio.s Ti03 (NKBT) nanowires as weU as their densification behavior were investigated. The morphology and structure analyses indicated that the sol-gel-bydrothermal route led to the formation of phase-pure perovskite NKBT nanowires with diameters of 50-80 nm and lengths of 1.5-2 Jim, and the processing temperature was as low as 160°C, but the conventional sol-gel route tended to lead to the formation of NKBT agglomerated porous structured nanopowders, and the processing temperature was higher than 650°C. It is believed that the gel precursor and hydrothermal environment play an important role in the formation of the nanowires at a low temperature. Owing to the better packing efficiency and therefore a good sinterability of the freestanding nanowbiskers, the pressed peUets made by NKBT nanowires showed > 98% theoretical density at HOO°C for 2 h. The solgel-bydrothermal-derived ceramics have typical characteristics of relaxor ferroelectrics, and the piezoelectric properties were better than the ceramics prepared by the conventional sol-gel and solid-state reaction.

show abstract

Sol–gel-hydrothermal synthesis and sintering of K0.5Bi0.5TiO3 nanowires

Cited by 46 publications

References 13 publications

Lead-free Bi-based complex perovskite nanowires: Sol–gel-hydrothermal processing and the densification behavior

Lead-free Bi-based complex perovskite nanowires: Sol–gel-hydrothermal processing and the densification behavior

Li₄Ti₅O₁₂ Nanoparticles Prepared with Gel‐hydrothermal Process as a High Performance Anode Material for Li‐ion Batteries

(Na_0.8K_0.2)_0.5Bi_0.5TiO₃Nanowires: Low‐Temperature Sol–Gel–Hydrothermal Synthesis and Densification

Contact Info

Product

Resources

About

Sol–gel-hydrothermal synthesis and sintering of K0.5Bi0.5TiO3 nanowires

Cited by 46 publications

References 13 publications

Lead-free Bi-based complex perovskite nanowires: Sol–gel-hydrothermal processing and the densification behavior

Lead-free Bi-based complex perovskite nanowires: Sol–gel-hydrothermal processing and the densification behavior

Li4Ti5O12 Nanoparticles Prepared with Gel‐hydrothermal Process as a High Performance Anode Material for Li‐ion Batteries

(Na0.8K0.2)0.5Bi0.5TiO3Nanowires: Low‐Temperature Sol–Gel–Hydrothermal Synthesis and Densification

Contact Info

Product

Resources

About

Li₄Ti₅O₁₂ Nanoparticles Prepared with Gel‐hydrothermal Process as a High Performance Anode Material for Li‐ion Batteries

(Na_0.8K_0.2)_0.5Bi_0.5TiO₃Nanowires: Low‐Temperature Sol–Gel–Hydrothermal Synthesis and Densification