Structural properties and phase transformation of sol–gel prepared lanthanum tantalates

Bruncková, Helena; Medvecký, Ľubomír; Durisin, Juraj; Hvizdoš, Pavol; Girman, Vladimír

doi:10.1007/s10853-014-8552-1

Cited by 12 publications

(2 citation statements)

References 48 publications

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“…Examples of such aerogel materials can be found in literature mainly on metal chalcogenides, metals and recently also metal oxides . The direct synthesis of tantalum oxide and tantalate gels is rather challenging, as the sol‐gel chemistry and especially the hydrolysis rate of tantalum precursors are difficult to control in the first place . Examples of tantalum oxide aerogels in literature are scarce .…”

Section: Introductionmentioning

confidence: 99%

Nonaqueous sol‐gel synthesis of InTaO₄ nanoparticles and their assembly into macroscopic aerogels

2017

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Due to their band gap energy, metal tantalates absorb both ultraviolet and visible parts of the solar spectrum, which is beneficial to applications in photocatalysis.However, tantalates are very challenging to synthesize. In comparison to traditional solid-state reactions, which often lead to impurities, wet-chemical approaches starting from molecular precursors offer better homogeneity. In this study, amorphous InTaO 4 nanoparticles were synthesised in a nonaqueous sol-gel method. Subsequent annealing at 800°C yielded crystalline and phase-pure nanoparticles. In addition, the amorphous nanoparticles could be used as building blocks for the assembly into macroscopic gels by careful centrifugation. After supercritical drying, the three-dimensionally interconnected microstructure was preserved, resulting in highly porous aerogel monoliths with a large surface area of 357 m 2 g À1 . Upon calcination, crystallization and 46% shrinkage of the aerogel occurred and a decrease in surface area to 49 m 2 g À1 was observed. Uniaxial compression tests revealed the mechanical stability of these nanoparticle-based aerogels. Although the large surface area and the ability to absorb visible light, combined with the unique mechanical properties, are ideal prerequisites to make these aerogels promising for photocatalytic reactions, the degradation of methylene blue only showed limited success.

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Section: Introductionmentioning

confidence: 99%

Nonaqueous sol‐gel synthesis of InTaO₄ nanoparticles and their assembly into macroscopic aerogels

2017

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“…Gas phase method [15], sol-gel method [16], and microemulsion flame spraying [17] are all common methods for the fabrication of nano-powders with the dimension of 10-100 nm. Besides, some modified methods are also carried out.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of size-controlled SiC/Si3N4 ceramic microspheres with enhanced extinction property

Kang

Liu

et al. 2015

Ceramics International

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Synthesis and dielectric enhancement of rare-earth ions substituted lanthanum tantalate solid solutions

2021

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Structural properties and phase transformation of sol–gel prepared lanthanum tantalates

Cited by 12 publications

References 48 publications

Nonaqueous sol‐gel synthesis of InTaO₄ nanoparticles and their assembly into macroscopic aerogels

Nonaqueous sol‐gel synthesis of InTaO₄ nanoparticles and their assembly into macroscopic aerogels

Fabrication of size-controlled SiC/Si3N4 ceramic microspheres with enhanced extinction property

Synthesis and dielectric enhancement of rare-earth ions substituted lanthanum tantalate solid solutions

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Structural properties and phase transformation of sol–gel prepared lanthanum tantalates

Cited by 12 publications

References 48 publications

Nonaqueous sol‐gel synthesis of InTaO4 nanoparticles and their assembly into macroscopic aerogels

Nonaqueous sol‐gel synthesis of InTaO4 nanoparticles and their assembly into macroscopic aerogels

Fabrication of size-controlled SiC/Si3N4 ceramic microspheres with enhanced extinction property

Synthesis and dielectric enhancement of rare-earth ions substituted lanthanum tantalate solid solutions

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Nonaqueous sol‐gel synthesis of InTaO₄ nanoparticles and their assembly into macroscopic aerogels

Nonaqueous sol‐gel synthesis of InTaO₄ nanoparticles and their assembly into macroscopic aerogels