Control of the boron content in amorphous powder prepared by borohydride reduction

Xue, Desheng; Li, F. S.; Zhou, Rongjie

doi:10.1007/bf00725858

Cited by 15 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the research of controlled B content in the amorphous powder [3], amorphous powders of (Feo,7C~n~3)loo-xBx (x = 27, 30, 33, 37, 40 at%) were prepared by adjusting the following technological factors to fulfil the condition that divalent metal ions were reduced fully: 1. sort of reduction agent (KBH, and NaBH,) and its concentration and volume; 2. volume and concentration of the mixture of divalent metal salts in the solution; 3. temperature at which the reaction takes place; 4. pH value of the reacting aqueous solution.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Mössbauer study of ultrafine FeCoB amorphous powder

Xue

1992

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

Ultrafine (Fe0.7Co0.3)100−xBx amorphous powders with boron content x in the range of 27 to 40 at% are prepared by borohydride reduction without oxide of Fe3+ in the samples. With increasing boron content the average hyperfine field decreases and the average isomer shift increases. Comparing the hyperfine parameters of FeCoB powder with those of FeB powder having the same compositions, it can be seen that the average hyperfine fields and isomer shifts are quite different and the local environment of FeCoB powder is more complicated than that of FeB amorphous powder. DSC results indicated that the stability of the powder increases with increasing B content.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The experimental procedure has been described elsewhere [3]. The boron content in the samples was analysed by the acid-base volume method.…”

Section: Methodsmentioning

confidence: 99%

Mössbauer study of ultrafine FeCoB amorphous powder

Xue

1992

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

show abstract

“…The ultrafine amorphous alloy powders combine the features of amorphous and ultrafine powders, have more surface atoms and a higher concentration of highly coordinated unsaturated sites. Their unique isotropic structural and chemical properties have attracted extensive interest in recent years 1–11. Previous investigators reported such a combination to create properties, particularly for catalytic10, 12 and magnetic recording applications 1.…”

Section: Introductionmentioning

confidence: 99%

“…Ultrafine amorphous alloy particles produced by chemical reduction have received increasing attention in recent years 1. 2, 5, 6, 12, 14, 15 Notably, the ultrafine amorphous alloy particles obtained by chemical reduction have the obvious merits of a larger surface area, the applicability for large‐scale production and the higher dispersion that can be compacted to serve many purposes 9…”

Section: Introductionmentioning

confidence: 99%

Catalytic properties of Ni-B and Ni-P ultrafine materials

Lee

Chen

2000

J. Chem. Technol. Biotechnol.

View full text Add to dashboard Cite

The ultra®ne Ni±B and Ni±P amorphous alloy catalysts were prepared by the chemical reduction method. The catalysts were characterized with respect to ICP-AES, XRD, nitrogen sorption, DSC, SEM, TEM and XPS. Nitrobenzene hydrogenation was used to compare their hydrogenation abilities. The different metalloids of boron and phosphorus bound to the nickel metal for the Ni±B and Ni±P catalysts result in the distinct different surface area, amorphous structure and hydrogenation activity of the catalysts. Ni±B had a larger surface area than Ni±P. The speci®c activity per surface area of Ni±P was greater than that of Ni±B. The different activities between the Ni±P and Ni±B can be attributed to the difference of the electron density on the nickel metal; boron donates electrons to the nickel metal and phosphorus accepts electrons from the nickel metal. The catalysts were easier to oxidize when they were exposed to air. This would result in the lower activity. However, the activity could be recovered in the reaction process due to the presence of hydrogen in the reaction system.

show abstract

“…The commercial importance of sodium borohydride reached its first peak in the fifties in U.S. military research programs [4,5]. Recently borohydride reduction of metal ions is the basis of several commercial processes including: (1) the preparation of selective catalysts, magnetic materials [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], (2) the recovery of precious metals (silver, gold, platinum and palladium group metals) [6,[25][26][27][28][29][30][31][32][33][34][35], (3) the removal and recovery of heavy metals (mercury, lead, copper, nickel, cobalt and silver) from aqueous discharge streams [36][37][38][39][40][41][42][43][44][45][46][47], and (4) the electroless plating of nickel, cobalt, copper, silver and gold o...…”

Section: Introductionmentioning

confidence: 99%

Cobalt precipitation by reduction with sodium borohydride

1997

View full text Add to dashboard Cite

In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission.

show abstract

Control of the boron content in amorphous powder prepared by borohydride reduction

Cited by 15 publications

References 6 publications

Mössbauer study of ultrafine FeCoB amorphous powder

Mössbauer study of ultrafine FeCoB amorphous powder

Catalytic properties of Ni-B and Ni-P ultrafine materials

Cobalt precipitation by reduction with sodium borohydride

Contact Info

Product

Resources

About