Mechanochemical Synthesis of Yttrium and Lanthanum Tantalates

Molchanov, V. V.; Зуев, М. Г.; Plyasova, L. M.; Bogdanov, S. V.

doi:10.1023/b:inma.0000012182.99092.6b

Cited by 25 publications

(16 citation statements)

References 5 publications

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“…Lanthanide orthotantalates can be prepared by different techniques. However, all of the existing techniques for the preparation of tantalates have two serious drawbacks: they require high temperatures and considerable time because of the low reactivity of the oxides involved and slow diffusion rates 16 . In general, the incompatibility between acid-soluble rare-earth oxides and based-soluble tantalum oxides render aqueous solution preparations more difficult 1 .…”

Section: Introductionmentioning

confidence: 99%

Effect of the processing parameters on the crystalline structure of lanthanide orthotantalates

Siqueira

Dias

2013

Mat. Res.

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The influence of the synthesis parameters on the crystalline structures of orthotantalate ceramics has been investigated. Powder materials were prepared by the solid-state reaction route. X-ray diffraction and Raman scattering measurements were employed to investigate the crystal structure of the produced materials. In this work, we analyzed three different examples in which the temperature and time were decisive on the final crystal structure of LnTaO 4 compounds besides the lanthanide ionic size. Firstly, the thermal evolution for NdTaO 4 samples showed that mixed crystal phases are formed up to 1100 °C, while well-crystallized M-NdTaO 4 (I2/a) materials are obtained in temperatures higher than 1200 °C. Also, the influence of the synthesis time was investigated for the LaTaO 4 ceramics: it was necessary 14 h to obtain samples in the P2 1 /c structure. Finally, two polymorphs could be obtained for the DyTaO 4 ceramics: P2/a and I2/a space groups were obtained at 1300 °C and 1500 °C, respectively. This study indicated that the temperature, time and lanthanide size are directly correlated with the crystalline arrangement of the orthotantalate materials.

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Section: Introductionmentioning

confidence: 99%

Effect of the processing parameters on the crystalline structure of lanthanide orthotantalates

Siqueira

Dias

2013

Mat. Res.

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“…At present, much attention has also been paid to the development of methods to synthesize Y(Nb x Ta 1-x )O 4 compositions that allow one to control the largeness of separate particles, and in particular, to obtain nanoscale powders. This substantially enhances the light efficiency of luminescent materials, increasing the emission intensity due to their higher structural homogeneity [4][5][6]. It is worth noting that the reports published so far lack studies on the mechanical characteristics of luminescent ceramics based on mixed yttrium tantalo-niobates.…”

Section: Introductionmentioning

confidence: 99%

SYNTHESIS, STRUCTURE, LUMINESCENT AND MECHANICAL PROPERTIES OF YNbхTa1–хO4 SOLID SOLUTIONS

et al. 2021

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A series of mixed yttrium tantalo-niobates (YNb х Ta 1-х O 4 , x = 0-1) is obtained by the sol-gel synthesis. It is shown that the temperature of this synthesis of YNb х Ta 1-х O 4 and its duration are much lower than those in the solid-phase synthesis. The properties of both synthesized powders and ceramic solid solutions (SSs) YNb х Ta 1-х O 4 , x = 0-1, prepared based on them, are investigated. It is found that under UV excitation at any Nb:Ta ratio in YNb х Ta 1-х O 4 SSs the luminescent signal is enhanced as compared to that in individual YNbO 4 and YTaO 4 compounds, which is caused by energy transfer between the Nb 4+ -Oand Ta 4+ -Oluminescence centers. Morphological features of the microstructure of ceramic YNb х Ta 1-х O 4 SSs are studied. Mechanical characteristics of ceramic YNb х Ta 1-х O 4 SSs, such as Young's modulus and the stress intensity factor for mode 1 K IC , which is a criterion of the material crack resistance, are estimated.

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“…The low temperature YTaO 4 actually exists in two polymorphs: M and M'. 125 The M'phase (fergusonite structure) transforms into the M-phase (scheelite structure 126 ) upon heating to 1400°C followed by cooling to below 1325°C. In the two polymorphs, yttrium is in a nearly cubic eightfold oxygen coordination, with a slight dodecahedral distortion, but the Ta-O bond distances in M'-YTaO 4 are shorter than those in M-YTaO 4 .…”

Section: Introductionmentioning

confidence: 99%

In-situ High Temperature Phase Transformations in Ceramics

Sarin¹,

Kriven²

2009

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This project was aimed at developing the foundation, based on existing knowledge of various high temperature material properties, to explore new ceramic materials with interesting phase transformation properties. The systems focused on were one and two component oxide ceramic systems with the potential for application in the aerospace industry, namely, high temperature, chemically stable, oxide ceramics. A thorough evaluation of literature was conducted to identify three to five key ceramic oxide materials that may have promising high temperature phase transformation behavior. Eventually, based on literature and PIs extensive knowledge on phase transformations in oxide ceramics, four candidate ceramic oxide materials were identified for in-depth investigation of their high temperature and phase transformation properties by state-of-the-art, in-situ high temperature experimentation which included DSC/TGA, dilatometry and high temperature X-ray diffraction using synchrotron radiation. These included (a) Y 2 SiO 5 , (b) CaWO 4 , (c) CePO 4 and (d) YTaO 4 .

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Mechanochemical Synthesis of Yttrium and Lanthanum Tantalates

Cited by 25 publications

References 5 publications

Effect of the processing parameters on the crystalline structure of lanthanide orthotantalates

Effect of the processing parameters on the crystalline structure of lanthanide orthotantalates

SYNTHESIS, STRUCTURE, LUMINESCENT AND MECHANICAL PROPERTIES OF YNbхTa1–хO4 SOLID SOLUTIONS

In-situ High Temperature Phase Transformations in Ceramics

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