The effect of particle size distribution on the phase composition in YBa2Cu3O7−x as determined by DTA

Barus, A. M. M.; Taylor, J. A. T.

doi:10.1016/0921-4534(94)90738-2

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…2(b), from which it can be seen that the positions of most of the DTG and DTA peaks are coincident. [26][27][28][29] These observations indicate that dehydration and nitrate decomposition in the spray-dried powder occur mainly below ϳ700 ± C and that the formation of the 123 and possibly 211 phases occurs at a significantly higher temperature. 3(a).…”

Section: A Nitrate Decomposition and Formation Of The 123 And 211 Phmentioning

confidence: 99%

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Cardwell

Dung

et al. 1996

J. Mater. Res.

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YBa 2 Cu 3 O 72d precursor powder suitable for the fabrication of melt-processed ceramic has been prepared by spray drying and subsequent calcination. The dehydration and decomposition processes in the nitrate-based spray-dried powder and the formation processes of the YBa 2 Cu 3 O 72d and Y 2 BaCuO 5 phases have been studied in detail using thermal analysis and powder x-ray diffractometry. The morphology, microstructure, and size distribution of the particles in the calcined powder have been investigated using high resolution scanning electron microscopy and particle size analysis and found to contain a significant proportion of submicron sized particles of Y 2 BaCuO 5 . Melt-processed samples prepared using the spray-dried powder have been observed to exhibit a significantly finer distribution of the 211 phase than is typically obtained in similar specimens prepared via a mixed oxide route. This provides direct evidence of the suitability of spray-dried precursor powder for the fabrication of large grain, high J c melt-processed YBCO ceramics.

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Section: A Nitrate Decomposition and Formation Of The 123 And 211 Phmentioning

confidence: 99%

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Cardwell

Dung

et al. 1996

J. Mater. Res.

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“…The mean particle size might have some effect; the possible effect of the spread of particle size in the sample appears, however, scarcely to have been considered [14]. Already, the effect of particle size on quantitative differential thermal analysis is generally considered in organic materials [8,9,26,27] and biomass sample, Pinus radiata [28]. Depending on various parameters such as particle size and density, surrounding temperature, oxygen concentration in the surrounding flow, the combustion of biomass particle may take place sequentially or simultaneously [29].…”

Section: Discussionmentioning

confidence: 98%

“…Previous studies have stated that the thermal decomposition and phase composition in thermal analysis are known to be influenced by particle size of the sample [8,9]. In the most popular thermoanalytical methods, such as TG, DTA, and DSC, powder samples are often the subject of investigation [10].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of green algae for comparing relationship between particle size and heat evolved

Kang

Yoon

2014

Biomass Conv. Bioref.

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The thermal properties affected by particle size of microbial cell were investigated by the simultaneous thermogravimetry (TG) and differential thermal analysis (DTA). The particle size, which could affect the heat evolved, occurred from the combustion of the microbial cells. The model microorganism used in this study is Nostoc, a genus of flamentous, heterocystous, and cyanobacteria, known as a freshwater microalga, which can accumulate a large amount of lipid in the cell. As a result, the marked difference in heat energy between the different particle sizes of microbial sample was detected in the temperature range from 310 to 351°C. So, the two-step linear temperature program is used for resolving the overlapping exothermic peaks in the DTA curves in the temperature range from 310 to 315°C. The heat evolved from 45 μm-sized particle sample in this temperature range was 3.78±0.19 kJ/g which was 1.1-to 1.4-fold greater than those from the other particle size samples. The heat evolved occurred in 310-351°C was inversely proportional to the particle size of dried microbial cells. In conclusion, exothermic heat per dry sample mass (kJ/g) in the temperature range from 310 to 351°C is highly dependent on the particle size of dried microbial cell.

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“…The sample was polished with diamond or alumina paste to a 50 nm finish, and rinsed with toluene or acetone in an ultrasonic vibrator. The toluene and acetone used for the rinsing of the polished sample have been reported as not reacting with the Y 123 superconductor and preventing the degradation of the superconducting phase with water [20]. The rinsed sample was etched in a mixture of 1% perchloric acid +99% butyl oxyethanol, and coated with a thin film of sputtered carbon.…”

Section: Characterizationmentioning

confidence: 99%

Synthesis of yttrium barium copper oxide-0.325Ag superconductors via intermediate precursor with overall composition Y:Ba:Cu:0=l:2:3:Y, Y>7 produced by high-energy attrition milling

Lee¹,

Park

Lee

2000

Metals and Materials

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A highly homogeneous composite precursor containing nano-scale particles was synthesized from the highenergy attrition milling of a mixture of metallic Y, metallic Cu and barium nitrate (Ba(NO&) containing 5 wt.% silver. +0.325Ag. Y 123-Ag superconductors in powder or bulk forms were prepared using heat treatment or thermomechanical processing of the intermediate precursor containing BaCuO,,. The high oxygen orthorhombic Y 123-Ag phase (y>7) was obtained in quenched samples which were held for 30 min or less at 950 "C in ambient air. As the holding time extended to 40 min, the sample was still orthorhombic Y123-Ag (6.79 7). The transport critical current density (Jc) at 77 K and zero magnetic field for the quenched sample which was held for 40 min at 950°C was -1.3~10~ A/cm*.

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The effect of particle size distribution on the phase composition in YBa2Cu3O7−x as determined by DTA

Cited by 11 publications

References 17 publications

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Thermal analysis of green algae for comparing relationship between particle size and heat evolved

Synthesis of yttrium barium copper oxide-0.325Ag superconductors via intermediate precursor with overall composition Y:Ba:Cu:0=l:2:3:Y, Y>7 produced by high-energy attrition milling

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