Preparation of Spectrographic Standards of Low Boron Content for Determination of Boron in Iron

1955 ◽  
Vol 27 (10) ◽  
pp. 1542-1543 ◽  
Author(s):  
J. C. Shyne ◽  
E. R. Morgan
Keyword(s):  
Boron Content

scholarly journals Determination of thermodynamic stability of FeB monoboride

2019 ◽  
Vol 27 (2) ◽  
pp. 69-76
Author(s):  
N. Yu. Filonenko ◽  
A. N. Galdina
Keyword(s):  
Thermodynamic Stability ◽  
Boron Content ◽  
Boron Concentration ◽  
Cast Alloy ◽  
Thermodynamic Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Temperature Expansion ◽  
Experimental Findings

In this paper we investigate the phase composition and phase transformations in the Fe-B system alloys with boron content in the range of 9.0–15.0 wt.%. We use microstructural, X-ray diffraction, differential thermal and durometric analyzes to determine the physical properties of the alloys. The experimental findings show that in the as-cast alloy structure there is Fe5B3 phase in small quantities along with FeB monoboride and Fe2B boride. The Fe5B3 phase is formed as a result of the peritectic reaction L+FeB→Fe5B3 at the temperature of 1680 K. The eutectic transformation L→Fe5B3 +Fe2B occurs in the boron concentration range of 8.8–10.5 wt.%. After annealing of the Fe-B alloys at the temperature of 1473 K and cooling with the rate of 102 K/s we observe the occurring of the Fe5B3 phase. To spot an opportunity of the secondary monoboride formation in the alloys under consideration, we calculate the thermodynamic characteristics of stability of the system. Accounting for the contribution of the first degree approximation of high-temperature expansion of thermodynamic potential of FeB iron monoboride in a Fe-B binary alloy enables us to study its thermodynamic stability. It is shown that stability decrease of FeB at 1423 K allows suggesting that at this temperature the phase transformation occurs and this fact correlates to the differential thermal analysis results.

Accurate and efficient determination of boron content in volcanic rocks by neutron induced prompt gamma-ray analysis

1999 ◽  
Vol 239 (3) ◽  
pp. 613-617 ◽  
Author(s):  
T. Sano ◽  
T. Fukuoka ◽  
T. Hasenaka ◽  
C. Yonezawa ◽  
H. Matsue ◽  
...  
Keyword(s):  
Boron Content ◽  
Gamma Ray ◽  
Volcanic Rocks ◽  
Prompt Gamma

Determination of the boron content of supplementary neutron poisons in critical assemblies by activation analysis

1988 ◽  
Vol 65 (1) ◽  
pp. 563-568
Author(s):  
I. N. Alekseev ◽  
L. M. Bogomolov ◽  
G. I. Borisov ◽  
M. M. Komkov ◽  
V. A. Kuz'michev ◽  
...  
Keyword(s):  
Activation Analysis ◽  
Boron Content

scholarly journals Determination of Boron Content in Volcanic Rocks by Using Neutron-induced Prompt .GAMMA.-Ray. Correction of Count Rate Fluctuation Using Silicon Internal Standard.

RADIOISOTOPES ◽  
1998 ◽  
Vol 47 (10) ◽  
pp. 735-744 ◽  
Author(s):  
Takashi SANO ◽  
Takaaki FUKUOKA ◽  
Toshiaki HASENAKA ◽  
Chushiro YONEZAWA ◽  
Hideaki MATSUE ◽  
...  
Keyword(s):  
Count Rate ◽  
Boron Content ◽  
Gamma Ray ◽  
Volcanic Rocks ◽  
Internal Standard ◽  
Prompt Gamma ◽  
Rate Fluctuation

scholarly journals Determination of “Effective Boron Content” in Steel

1976 ◽  
Vol 16 (10) ◽  
pp. 538-544 ◽  
Author(s):  
Kazuo KAWAMURA ◽  
Takashi OTSUBO ◽  
Takeshi FURUKAWA
Keyword(s):  
Boron Content

Emission Spectrographic Analysis of Boron in 40% NH4F Solution

1974 ◽  
Vol 28 (4) ◽  
pp. 369-371 ◽  
Author(s):  
Carlo Grilletto
Keyword(s):  
Detection Limit ◽  
Reliable Method ◽  
Boron Content ◽  
Accurate Determination ◽  
Ammonium Fluoride ◽  
Spectrographic Analysis ◽  
Fluoride Solution ◽  
Spectrographic Method ◽  
Boron Level

This paper describes a reliable emission spectrographic method capable of quantitatively determining boron in the 0.5 to 50 ppm range. The detection limit for the method is 0.1 ppm. Previous to this report no reliable method was available for the accurate determination of boron in reagent 40% ammonium fluoride solution in the ppm range; consequently, no incoming inspection or manufacturer's certification was available for boron content. Analysis of representative ammonium fluoride samples shows that the boron level is less than 0.1 ppm, suggesting that this element may not be a major problem in ammonium fluoride reagent.

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