Synthesis of High-purity YBa2Cu3O7-d Superconductors by Polymerized Complex Method.

AbstractThe high-purity and superfine high-entropy zirconate nanopowders, namely (Y0.25La0.25Sm0.25Eu0.25)2Zr2O7 nanopowders, without agglomeration, were successfully synthesized via polymerized complex method at low temperatures for the first time. The results showed that the crystallinity degree, lattice strain, and particle size of the as-synthesized powders were gradually enhanced with the increase of the synthesis temperature from 800 to 1300 °C. The as-synthesized powders involved fluorite phase in the range of 800–1200 °C while they underwent the phase evolution from fluorite to pyrochlore at 1300 °C. It is worth mentioning that the as-synthesized powders at 900 °C are of the highest quality among all the as-synthesized powders, which is due to the fact that they not only possess the particle size of 11 nm without agglomeration, but also show high purity and good compositional uniformity.

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CuBi2O4 Prepared by the Polymerized Complex Method for Gas-Sensing Applications

ACS Applied Materials & Interfaces ◽

10.1021/acsami.8b02439 ◽

2018 ◽

Vol 10 (17) ◽

pp. 14901-14913 ◽

Cited By ~ 19

Author(s):

Yun-Hyuk Choi ◽

Dai-Hong Kim ◽

Seong-Hyeon Hong

Keyword(s):

Gas Sensing ◽

Complex Method ◽

Sensing Applications ◽

Polymerized Complex Method

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Microwave-assisted synthesis of nanocrystalline BaMoO4 by a polymerized complex method and its photoluminescent property

Journal of Materials Science ◽

10.1007/s10853-005-1539-1 ◽

2005 ◽

Vol 40 (18) ◽

pp. 4979-4982 ◽

Cited By ~ 4

Author(s):

Jeong Ho Ryu ◽

Bong Geun Choi ◽

Seon Hye Kim ◽

Jong-Won Yoon ◽

Chang Sung Lim ◽

...

Keyword(s):

Microwave Assisted Synthesis ◽

Complex Method ◽

Photoluminescent Property ◽

Microwave Assisted ◽

Polymerized Complex Method

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Model Calibration for the High-Purity Oxygen Activated Sludge Process – Algorithm Development and Evaluation

Water Science & Technology ◽

10.2166/wst.1993.0656 ◽

1993 ◽

Vol 28 (11-12) ◽

pp. 163-171 ◽

Cited By ~ 15

Author(s):

Weibo (Weber) Yuan ◽

David Okrent ◽

Michael K. Stenstrom

Keyword(s):

Activated Sludge ◽

High Purity ◽

Model Calibration ◽

Process Model ◽

Model Parameters ◽

Complex Method ◽

Activated Sludge Process ◽

Activated Sludge Model ◽

Kinetic Coefficients ◽

Calibration Algorithm

A model calibration algorithm is developed for the high-purity oxygen activated sludge process (HPO-ASP). The algorithm is evaluated under different conditions to determine the effect of the following factors on the performance of the algorithm: data quality, number of observations, and number of parameters to be estimated. The process model used in this investigation is the first HPO-ASP model based upon the IAWQ (formerly IAWPRC) Activated Sludge Model No. 1. The objective function is formulated as a relative least-squares function and the non-linear, constrained minimization problem is solved by the Complex method. The stoichiometric and kinetic coefficients of the IAWQ activated sludge model are the parameters focused on in this investigation. Observations used are generated numerically but are made close to the observations from a full-scale high-purity oxygen treatment plant. The calibration algorithm is capable of correctly estimating model parameters even if the observations are severely noise-corrupted. The accuracy of estimation deteriorates gradually with the increase of observation errors. The accuracy of calibration improves when the number of observations (n) increases, but the improvement becomes insignificant when n>96. It is also found that there exists an optimal number of parameters that can be rigorously estimated from a given set of information/data. A sensitivity analysis is conducted to determine what parameters to estimate and to evaluate the potential benefits resulted from collecting additional measurements.

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Synthesis of ZrO2–Y6WO12 solid solution powders by a polymerized complex method

Journal of Materials Research ◽

10.1557/jmr.1998.0130 ◽

1998 ◽

Vol 13 (4) ◽

pp. 939-943 ◽

Cited By ~ 10

Author(s):

Junfeng Ma ◽

Masahiro Yoshimura ◽

Masato Kakihana ◽

Masatomo Yashima

Keyword(s):

Solid Solution ◽

Crystallite Size ◽

Surface Area ◽

Solid Solutions ◽

Lattice Parameter ◽

Cubic Phase ◽

Complex Method ◽

Amorphous Precursor ◽

Fine Powders ◽

Polymerized Complex Method

A series of solid solutions (1 − x) ZrO2 · xY0.857 W0.143 O1.714 (1/7Y6WO12) of metastable cubic phase were synthesized at 800 °C through a polymerized complex method. Lattice parameter a0 of solid solutions varies linearly with Y0.857 W0.143 O1.714 content (x). Crystallization began to occur above 400 °C from amorphous precursor to yield at 800 °C fine powders of 6–10 nm and 19–40 m2/g for crystallite size and surface area, respectively.

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