Refinement of the crystal structure of Na2Ti3O7

Yakubovich, O. V.; Kireev, V. V.

doi:10.1134/1.1541737

Cited by 71 publications

(49 citation statements)

References 3 publications

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“…The spread of the individual TiÀO distances in the Ti(1)ÀO and Ti(2)ÀO octahedra is very close to the mean value, while the variation of TiÀO distances in the Ti(3)ÀO octahedron is much larger ( Table 3), however. The shortest distance is comparable with the TiÀO distance of 1.7086 reported for Na 2 Ti 3 O 7 [9], the longest Ti(3)ÀO(4) being close to the value of 2.5389 , found in the high temperature modification of BaTi 2 O 5 [10]. The large distortion of the Ti(3)ÀO 6 coordination polyhedron makes it reasonable to better interpret the short Ti(3)ÀO(6) contact as a titanyl group.…”

supporting

confidence: 88%

Na₆[Ti₅O₁₂(OH)₂]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti₅O₁₂(OH)₂]⁶⁻ Ribbons

Wörle

Lorenzen

Nesper

2009

Helvetica Chimica Acta

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supporting

confidence: 88%

Na₆[Ti₅O₁₂(OH)₂]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti₅O₁₂(OH)₂]⁶⁻ Ribbons

Wörle

Lorenzen

Nesper

2009

Helvetica Chimica Acta

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“…The Na/Ti = 0.67 ratio is similar to that observed in the lamellar Na 2 Ti 3 O 7 (sodium titanate) compound. 26 Our analysis indicates that the composition of the nanotubes washed with deionized water is close to Na 2 Ti 3 O 7 . Therefore, we propose that the Na belongs to the nanotube structure, as we discuss below.…”

Section: Structure and Composition Of The Nanotubesmentioning

confidence: 98%

“…We have proposed that the structure of the as-prepared NTTiO x is very close to the Na 2 Ti 3 O 7 phase. The structural difference between Na 2 Ti 3 O 7 and Na 2 Ti 6 O 13 is that the former presents a lamellar structure with Ti 3 O 7 2-corrugated layers (steps formed by the connections among three TiO 6 octahedron) and two interlamellar Na + ions, 26 while the latter exhibits a tunnellike structure with two Na + ions inside the tunnel. From the structural point of view, the tunnels of the Na 2 Ti 6 O 13 phase can be formed from lamellar Na 2 Ti 3 O 7 by connection of Ti 3 O 7 2-units of adjacent layers, keeping the two Na + ions inside the tunnel.…”

Section: Thermal Decomposition Of Titanate Nanotubesmentioning

confidence: 99%

Unveiling the structure and composition of titanium oxide nanotubes through ion exchange chemical reactions and thermal decomposition processes

Ferreira¹,

Filho²,

Filho³

et al. 2006

J. Braz. Chem. Soc.

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Neste trabalho reportamos reações de troca iônica e decomposição térmica em nanotubos de óxido de titânio, obtidos pelo tratamento hidrotérmico de TiO 2 e NaOH. Considerando os resultados obtidos, sugerimos uma nova composição química para os nanotubos: Na 2 Ti 3 O 7 ·nH 2 O. Os resultados também indicam que a estrutura da parede dos nanotubos seria isoestrutural às lamelas observadas para o Na 2 Ti 3 O 7 bulk. Dependendo da natureza da lavagem (água deionizada ou solução ácida) executada no nanotubo após o tratamento hidrotérmico a concentração de íons Na + pode ser modificada através de um processo de troca iônica do Na + por H + . Tais resultados permitem sugerir a seguinte fórmula química geral para os nanotubos obtidos: Na 2-x H x Ti 3 O 7 ·nH 2 O (0≤ x ≤2), sendo x dependente das condições de lavagens.In this paper we report the ion exchange reactions and the thermal decomposition of titanium oxide nanotubes, obtained by hydrothermal treatment of TiO 2 and NaOH. Based on these results we propose a new composition for the as-prepared nanotubes as Na 2 Ti 3 O 7 ·nH 2 O. Our results also suggest that nanotube walls have structure similar to those observed in the layer of the bulk Na 2 Ti 3 O 7 . Depending on how the washing process is performed on the nanotubes (water or acid solutions) the Na + content can be modified via the exchange reaction of Na + by H + . Thus, a general chemical formula was also proposed: Na 2-x H x Ti 3 O 7 ·nH 2 O (0≤ x ≤2), x being dependent on the washing process.Keywords: titanate nanotubes, nanorods, TiO 2 , photocatalysis, hydrothermal treatment IntroductionThe discovery of carbon nanotubes in early 90's opened a new research area in materials science. 1 Since then, much attention has been given to the study and search for new materials with tubular structures. The understanding of nanotube formation mechanisms has significantly improved but a clear picture of this process is still an open subject. Since carbon nanotubes originate from graphite layers (graphene) a lot of effort has been devoted to prepare nanotubes from other layered materials. After carbon nanotubes the first studied inorganic nanotubes were WS 2 , MoS 2 , BN and NbS 2 . [2][3][4][5] The preparation of these nanotubes from layered materials leads to the thought that is possible to prepare nanotubes from all materials whose bulk counterpart is a layered compound. Nowadays, a considerable list of inorganic nanotubes is known and it is increasing at an amazing rate. Among the inorganic nanotubes, titanium oxide nanotubes are very attractive because these nanostructures are promising for applications as photocatalysts, UV absorbers, dye-sensitizing solar cells, self-cleaning devices, and catalyst supports. 6,7 Kasuga et al. 8 reported the preparation of titanium oxide nanotubes through hydrothermal treatment of TiO 2 -SiO 2 powders in aqueous NaOH solutions. This preparation method is very simple and inexpensive. However, a great debate has been established in the literature regarding the formation mechanism, compo...

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“…The difference in the structures of sodium trititanates and sodium hexatitanates is that the former presents a lamellar structure with Ti 3 O 7 2-corrugated layers and two interlamellar Na + ions [18]. Sauvet et al [19] proposed that at higher temperatures sodium trititanates tend to fuse and the formation of Na 2 Ti 6 O 13 is the result of ''dimerization like'' process of Na2Ti3O7.…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability on Morphology and Crystal Structures of Hydrothermally Synthesized Titanate Nanotubes and Their Photocatalytic Activity

Razali¹,

Osman²,

Rozaini³

et al. 2017

Asian J. Chem.

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Thermal stability on morphology and crystal structure of hydrothermally synthesized titanates nanotubes was investigated. Morphology study by FESEM and TEM revealed that the synthesized titanate nanotubes retained up to 500 °C before converted into nanowires and nanorods at 600 and 700 °C, respectively. The crystal structure of sodium trititanate nanotubes remained unchanged upon thermal treatment from 300 to 500 °C. However at 600 and 700 °C, the interlayer titanate in sodium trititanate samples undergo dimerization like process leading to the formation of an intermediate nanostructured hexatitanate, just before transformed into the corresponding anatase TiO2 crystals. Titanate nanotubes either trititanate or hexatitanate show low photocatalytic activity for methyl orange degradation due to their inter-layered crystal structure.

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Refinement of the crystal structure of Na2Ti3O7

Cited by 71 publications

References 3 publications

Na₆[Ti₅O₁₂(OH)₂]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti₅O₁₂(OH)₂]⁶⁻ Ribbons

Na₆[Ti₅O₁₂(OH)₂]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti₅O₁₂(OH)₂]⁶⁻ Ribbons

Unveiling the structure and composition of titanium oxide nanotubes through ion exchange chemical reactions and thermal decomposition processes

Thermal Stability on Morphology and Crystal Structures of Hydrothermally Synthesized Titanate Nanotubes and Their Photocatalytic Activity

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Refinement of the crystal structure of Na2Ti3O7

Cited by 71 publications

References 3 publications

Na6[Ti5O12(OH)2]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti5O12(OH)2]6− Ribbons

Na6[Ti5O12(OH)2]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti5O12(OH)2]6− Ribbons

Unveiling the structure and composition of titanium oxide nanotubes through ion exchange chemical reactions and thermal decomposition processes

Thermal Stability on Morphology and Crystal Structures of Hydrothermally Synthesized Titanate Nanotubes and Their Photocatalytic Activity

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Na₆[Ti₅O₁₂(OH)₂]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti₅O₁₂(OH)₂]⁶⁻ Ribbons

Na₆[Ti₅O₁₂(OH)₂]: A New Titanate Containing $\rm{{_{\infty }^{1}}}$[Ti₅O₁₂(OH)₂]⁶⁻ Ribbons