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Violet Iron Oxide: Precipitated Hematite Calcined at 1000-1100 °C (Nurdini et al. 2022)
Iron hydroxide is thrown down from hot ferric nitrate solution with ammonia, washed, dried and calcined. All of it ends as pure hematite, but the colour moves from bright red through dark red to purple as the calcining heat rises from 1000 °C, because the grains grow larger and more crystalline.
Result: pure violet to purple ferric oxide (hematite) after 4 hours at 1000-1100 °C.
Source: Nurdini et al., Heliyon 8 (2022) e10377, sections 2.2 and 4. Not given: batch size, how much ammonia, end pH, yield. Picture drawn by Youblob.
Àárín
2 days
Ìlànà
1
1
Heat the ferric nitrate solution
Heat the ferric nitrate solution
Make a 0.05 M solution of ferric nitrate in distilled water and heat it to 80 °C.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ferric nitrate1 as requiredÀwọn irinṣẹ́ tí a nílò:
Omi Àyọ́
Ago Gílásì
Pátákó Gbígbóná
Ẹ̀rọ Ìwọ̀n Ooru2
2
Throw down the hydroxide with ammonia
Throw down the hydroxide with ammonia
Keeping it at 80 °C, add ammonia solution drop by drop while stirring well. Stir for 3 hours, then let it cool to room temperature: a red-brown precipitate forms. Not given: how much ammonia.
Àwọn irinṣẹ́ tí a nílò:
Omi amonia - 25-28 %
Fọ́nẹ́ẹ̀lì Ìsọ̀kalẹ̀ ÌkánPátákó GbígbónáẸ̀rọ Ìwọ̀n Ooru3
3
Spin down, wash and dry
Spin down, wash and dry
Collect the precipitate in a centrifuge at 4000 rpm for 15 minutes, wash it with distilled water, and dry it at 110 °C for 24 hours.
Àwọn irinṣẹ́ tí a nílò:
Centrifuge orí tábìlìOmi Àyọ́
Ààrò ìgbẹ̀4
4
Calcine at 1000-1100 °C
Calcine at 1000-1100 °C
Calcine for 4 hours in air at 1000-1100 °C. Below 1000 °C it stays bright or dark red; from 1000 °C it turns purple. Grind the cooled oxide to a fine powder (they used an agate mortar).
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffle
Odó àti Ọmọ OdóÀwọn ohun-èlò
1- 1 as requiredÀyè
Àwọn irinṣẹ́ tó nílò
10- Àyè
- Àyè
- Àyè
- Àyè
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