A REVISION OF THE ATOMIC WEIGHT OF IRON.<sup>1</sup> [FIFTH PAPER.] THE ANALYSIS OF FERRIC OXIDE.

Baxter, Gregory Paul; Hoover, Charles R.

doi:10.1021/ja02213a003

Cited by 22 publications

(4 citation statements)

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“…This procedure is similar to the one successfully employed on a small scale by Baxter and Hoover [13] in their classic determination of the atomic weight of iron.…”

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 90%

“…The rate of the reaction increases with increasing temperature until an optimum temperature for rapid and complete reduction is reached, between 500 0 and 600° C [ll, 12,13]. With increasing temperature above the optimum range there is an increasing tendency to sinter the surface of the particles of partially reduced oxide, which hinders the penetration of hydrogen to the cen tel' of the particles and thus increases the time required to complete the reduction.…”

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 99%

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Preparation of high-purity iron

Thompson¹,

Cleaves²

1939

J. RES. NATL. BUR. STAN.

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Iron of high purity, in the form of 1-lb ingots, has been prepared by reducing purified iron oxide to sponge iron, melting the sponge iron, and remelting under hydrogen and in vacuo. The ingots were examined by spectroscopic and chemical methods for the presence of 55 possible impurities; the number of impurities that could be identified in individual ingots ranges from 6 to 9. The total of impurities in each ingot in most cases is less than 0.010 percent. The major impurities are nonmetallic, chiefly oxygen and sulfur, with traces of carbon, phosphorus, nitrogen, and hydrogen. Copper is the only metallic impurity in seven of the ingots; others contain small amounts of silicon and occasional traces of aluminum or beryllium from the refractories.

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“…This procedure is similar to the one successfully employed on a small scale by Baxter and Hoover [13] in their classic determination of the atomic weight of iron.…”

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 90%

Section: Conversion Of Purified Oxide To Sponge Ironmentioning

confidence: 99%

Preparation of high-purity iron

Thompson¹,

Cleaves²

1939

J. RES. NATL. BUR. STAN.

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show abstract

“…Aston (48) has concluded that there are two isotopes of mass 56 and 54, respectively, the latter being about 5 percent as abundant as the rrincipal isotope. 3 Iron forms two series of chemica compounds, ferrous and ferric, in which the iron is bivalent and trivalent, respectively.…”

Section: Atomic Propertiesmentioning

confidence: 99%

“…According to Heindlhofer (61) no allotropic change in iron below 0° C has ever been observed. 3. STRUCTURE Crystallographic studies of iron crystals indicated that iron crystallizes in the cubic or isometric system.…”

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confidence: 99%