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Strontium Ferrite Disc Magnet: 1 mol SrCO3 to 3 mol Iron Oxide, 1220 °C (Went, Philips 1956, Ex. 10)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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Strontium Ferrite Disc Magnet: 1 mol SrCO3 to 3 mol Iron Oxide, 1220 °C (Went, Philips 1956, Ex. 10)

A strontium ferrite: 1 mol strontium carbonate to 3 mol iron oxide, milled, bound and formed as in Example 4, and passed through a 1220 °C furnace in 10 minutes. Went's rod held 1,790 gauss with a coercive force of 3,260 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 10. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Hejuru
2 days

Amabwiriza

1

Weigh strontium carbonate and iron oxide

Weigh 147.6 g strontium carbonate (1 mol) and 484.1 g ferric oxide (3 mol).

Ibikoresho by'iyi ntambwe:

Carbonate ya strontiumCarbonate ya strontium147.6 g
Oxide ya feriOxide ya feri484.1 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Agapfukamunwa ka P100Agapfukamunwa ka P100
2

Mill with alcohol 15.5 hours, dry and sieve

As in Example 4: grind the mixture with alcohol in a ball mill for 15.5 hours, then dry it and sieve it.

Ibikoresho bikenewe:

Urusyo rw'imipira y'icyumaUrusyo rw'imipira y'icyuma
Etanoli - urwego rw'ubushakashatsi, 95 %Etanoli - urwego rw'ubushakashatsi, 95 %
Ifuru yo kumishahoIfuru yo kumishaho
AkayungurizoAkayungurizo
3

Knead with a binder and form

Mix 300 g of the powder with a binder such as polyvinyl alcohol (Went names it or nitrocellulose) into a kneadable mass. The patent extrudes rods about 3 mm across; ours: press discs at 1.5 tonnes per cm², as in its other examples. Dry them in air for about 24 hours.

Ibikoresho bikenewe:

Ifu ya polyvinyl alcoholIfu ya polyvinyl alcohol
Imashini ikanda ikoresha amaziImashini ikanda ikoresha amazi
Ifumbiro ryo gukanda disikiIfumbiro ryo gukanda disiki
Ifuru yo kumishahoIfuru yo kumishaho
4

Pass through a 1220 °C zone in 10 minutes

Sinter in air at 1220 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute: 10 minutes in the heat.

Ibikoresho bikenewe:

Itanura ry'umuyoboroItanura ry'umuyoboro
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
5

Magnetise the discs

The patent gives no magnetising method. Ours: lay a disc with its faces against the poles of a strong electromagnet, switch the current on, then off. Find which face is north with a compass.

Ibikoresho bikenewe:

Iroha ry'amashanyaraziIroha ry'amashanyarazi
IkirangamurongoIkirangamurongo

Ibikoresho

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Ibikoresho bikenewe

13

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Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

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Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)

Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)

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