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Barium-Strontium Ferrite Disc Magnet: 0.5 mol BaCO3, 0.5 mol SrCO3, 1260 °C (Went, Philips 1956, Ex. 28)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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28. Oktoba 2026DE
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Barium-Strontium Ferrite Disc Magnet: 0.5 mol BaCO3, 0.5 mol SrCO3, 1260 °C (Went, Philips 1956, Ex. 28)

A ceramic magnet with both barium and strontium: 0.5 mol barium carbonate and 0.5 mol strontium carbonate to 3 mol iron oxide, milled 15 hours, pressed and passed through a 1260 °C furnace in 20 minutes. Went's rod held 1,665 gauss with a coercive force of 3,235 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 28. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
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Maagizo

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Weigh the carbonates and iron oxide

Weigh 99.2 g barium carbonate (0.5 mol), 73.8 g strontium carbonate (0.5 mol), 483.3 g ferric oxide (3 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Vifaa kwa hatua hii:

Kabonati ya bariamu (witherite)Kabonati ya bariamu (witherite)99.2 g
Kaboneti ya strontiamuKaboneti ya strontiamu73.8 g
Oksidi ya feriOksidi ya feri483.3 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Glavu za mpiraGlavu za mpira
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
2

Mill with alcohol 15 hours, dry

Grind the mixture with alcohol in a ball mill for 15 hours, then dry it.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %
Tanuri la kukaushiaTanuri la kukaushia
3

Press the powder

Example 28 moulds a rod without giving the pressure. Ours: press discs at 1.5 tonnes per cm², the pressure of the patent's other examples.

Zana zinazohitajika:

Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
4

Pass through a 1260 °C zone in 20 minutes

Sinter at 1260 °C by passing the pieces through a 10 cm hot zone at 5 mm per minute: 20 minutes in the heat.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
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.

Zana zinazohitajika:

Sumaku ya umemeSumaku ya umeme
DiraDira

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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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Viwandani

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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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Viwandani

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