Influence of stoichiometry and alkalinity on barium hexaferrite formation via the supercritical water crystallization method

2002 ◽  
Vol 19 (1) ◽  
pp. 120-125 ◽  
Author(s):  
Seungwook Rho ◽  
Sangdo Park
Keyword(s):  
Supercritical Water ◽  
Barium Hexaferrite ◽  
Crystallization Method ◽  
Water Crystallization

Crystallization of barium hexaferrite

1992 ◽  
Vol 50 (1) ◽  
pp. 362-363
Author(s):  
Chung-kook Lee ◽  
Yolande Berta ◽  
Robert F. Speyer
Keyword(s):  
Size Distribution ◽  
Raw Materials ◽  
Barium Hexaferrite ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Promising Candidate ◽  
Crystallization Method ◽  
Temperature Heat ◽  
High Density Magnetic Recording ◽  
Temperature Heat Treatment

Barium hexaferrite (BaFe12O19) is a promising candidate for high density magnetic recording media due to its superior magnetic properties. For particulate recording media, nano-sized single crystalline powders with a narrow size distribution are a primary application requirement. The glass-crystallization method is preferred because of the controllability of crystallization kinetics, hence, particle size and size distribution. A disadvantage of this method is the need to melt raw materials at high temperatures with non-reactive crucibles, e.g. platinum. However, in this work, we have shown that crystal growth of barium hexaferrite occurred during low temperature heat treatment of raw batches.

ChemInform Abstract: Flow Method for Rapidly Producing Barium Hexaferrite Particles in Supercritical Water.

ChemInform ◽  
2010 ◽  
Vol 29 (49) ◽  
pp. no-no
Author(s):  
Y. HAKUTA ◽  
T. ADSCHIRI ◽  
T. SUZUKI ◽  
T. CHIDA ◽  
K. SEINO ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Barium Hexaferrite ◽  
Flow Method

Flow Method for Rapidly Producing Barium Hexaferrite Particles in Supercritical Water

2005 ◽  
Vol 81 (9) ◽  
pp. 2461-2464 ◽  
Author(s):  
Yukiya Hakuta ◽  
Tadafumi Adschiri ◽  
Toshiyuki Suzuki ◽  
Toshihiro Chida ◽  
Kazuei Seino ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Barium Hexaferrite ◽  
Flow Method

SYNTHESIS AND PROPERTIES OF ACICULAR BARIUM HEXAFERRITE

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-839-C8-840 ◽  
Author(s):  
M. Najmi ◽  
P. Poix ◽  
J. C. Bernier
Keyword(s):  
Barium Hexaferrite

Preparation of M-type Barium Hexaferrite and Studying Structural and Microwave Properties

2017 ◽  
Vol 13 (2) ◽  
pp. 167-182
Author(s):  
Tahseen Mubarak ◽  
Lubab  Ali Salman ◽  
Saib Thiab Alwan ◽  
Hussein Sulaiman Mahmood
Keyword(s):  
Barium Hexaferrite ◽  
Microwave Properties

PENGGUNAAN AIR SUPER KRITIS PADA DEPOLIMERISASI NYLON-12 (BATCH PROCESS)

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Mohamad Yusman
Keyword(s):  
Supercritical Water ◽  
Scale Up ◽  
Experimental Studies ◽  
Reaction System ◽  
Batch Process ◽  
Chemical Recycling ◽  
Water Decomposition ◽  
Product Distributions ◽  
New Process ◽  
Nylon 12

Water at the supercritical state is a new process for the chemical recycling. At this thermodynamic state i.e. Pc = 218 atmospheres and Tc = 374oC , water behaves very differently from its everyday temperament and it is a very good solvent for organic components. Experimental studies show that supercritical water can decompose hydrocarbons/polymers and produce useful products like 2-Azacyclotridecanone /lactam-1 from Nylon-12 (batch process). The decomposition process itself was carried out in batch reaction system in order to get more information about product distributions, time dependence, and scale-up possibilities.Keywords: supercritical water, decomposition, batch, polymer, hydrocarbon

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