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Barium-Strontium Ferrite Disc Magnet: 0.5 mol BaCO3, 0.5 mol SrCO3, 1240 °C (Went, Philips 1956, Ex. 29)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
Charlie

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Charlie

28. Oktubre 2026DE
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Barium-Strontium Ferrite Disc Magnet: 0.5 mol BaCO3, 0.5 mol SrCO3, 1240 °C (Went, Philips 1956, Ex. 29)

A ceramic magnet with both barium and strontium: 0.5 mol barium carbonate and 0.5 mol strontium carbonate to 2.5 mol iron oxide, milled as in Example 28, pressed and passed through a 1240 °C furnace in 10 minutes. Went's rod held 1,550 gauss with a coercive force of 3,410 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 29. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Abantado
2 days

Mga Tagubilin

1

Weigh the carbonates and iron oxide

Weigh 99.2 g barium carbonate (0.5 mol), 73.8 g strontium carbonate (0.5 mol), 402.0 g ferric oxide (2.5 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Mga materyales para sa hakbang na ito:

Barium carbonate (witherite)Barium carbonate (witherite)99.2 g
Strontium carbonateStrontium carbonate73.8 g
Ferric oxideFerric oxide402 g

Mga kailangang kasangkapan:

Timbangang panimbangTimbangang panimbang
Gwantes na gomaGwantes na goma
Panala sa Hininga na P100Panala sa Hininga na P100
2

Mill with alcohol 15 hours, dry

As in Example 28: grind the mixture with alcohol in a ball mill for 15 hours, then dry it.

Mga kailangang kasangkapan:

Gilingang Bolang BakalGilingang Bolang Bakal
Etanol - antas laboratoryo, 95 %Etanol - antas laboratoryo, 95 %
Hurnong pantuyoHurnong pantuyo
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.

Mga kailangang kasangkapan:

Haydroliko na pandiinHaydroliko na pandiin
Hulmahan sa pagpindot ng diskHulmahan sa pagpindot ng disk
4

Pass through a 1240 °C zone in 10 minutes

Sinter at 1240 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute: 10 minutes in the heat.

Mga kailangang kasangkapan:

Hurnong TuboHurnong Tubo
Guwantes na Matibay sa InitGuwantes na Matibay sa Init
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.

Mga kailangang kasangkapan:

ElektromagnetoElektromagneto
KompasKompas

Mga Materyales

3

Mga Kinakailangang Kasangkapan

12

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Disc na Magnet

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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)

ni CharlieDE

Industriyal

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

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

ni CharlieDE

Industriyal

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