ビスマス虹色結晶の育成

溶融ビスマスから虹色のホッパー結晶を作る

Crystallization Advanced (University) 45 分 ~$25.00

目的

ビスマス金属を溶融させ、冷却速度を制御することで幾何学的な階段状構造を持つ虹色のビスマスホッパー結晶を育成する。

背景

Bismuth forms unique hopper crystals with a staircase-like pattern when cooled slowly from its melt. The iridescent rainbow colors come from a thin oxide layer on the surface, similar to the colors in soap bubbles. Bismuth has one of the lowest thermal conductivities of any metal, which facilitates hopper crystal formation.

安全上の警告

  • Molten bismuth is at 271°C — severe burn risk
  • Use heavy-duty heat-resistant gloves
  • Work on a fireproof surface
  • Ensure good ventilation
  • Never add water to molten metal

必要なPPE

goggles gloves lab_coat

材料

  • Bismuth metal (500 g)
    Pellets or chunks

器具

Steel or cast iron pot (dedicated) Hot plate or stove Metal tongs or pliers Steel ladle Heat-resistant surface

手順

1

Place 500 g of bismuth pellets in the dedicated steel pot. Heat on the hot plate until fully melted (melting point 271°C).

15 分 Molten metal — extreme burn risk
2

Once melted, skim the dull gray oxide layer from the surface using the ladle.

2 分 Use heat-resistant gloves
3

Turn off the heat and allow the bismuth to cool slowly. Watch for the surface to begin solidifying (a thin crust forms).

10 分
4

When about 80% solidified (crust firm but center still liquid), carefully pour out the remaining liquid bismuth into a separate container.

3 分 Pour away from body
5

Allow the crystals remaining in the pot to cool completely.

10 分 Very hot — do not touch
6

Once cool, gently remove the bismuth crystal cluster. Examine the geometric staircase patterns and rainbow oxide colors.

5 分

予想される結果

Geometric hopper crystals with a distinctive staircase pattern. The thin bismuth oxide layer produces iridescent rainbow colors (pink, blue, gold, green). Crystal size depends on cooling rate — slower cooling produces larger crystals.

後片付け

Bismuth is non-toxic and can be remelted for future use. Store crystals in a display case. Clean the pot for reuse.

詳細

カテゴリ
Crystallization
難易度
Advanced (University)
所要時間
45 分
推定費用
$25.00
ステップ数
6
材料
1

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Frequently Asked Questions

What is the objective of ビスマス虹色結晶の育成?
ビスマス金属を溶融させ、冷却速度を制御することで幾何学的な階段状構造を持つ虹色のビスマスホッパー結晶を育成する。
How difficult is ビスマス虹色結晶の育成?
This experiment is rated as Advanced (University). It takes approximately 45 minutes to complete.
What safety precautions are needed for ビスマス虹色結晶の育成?
Key safety precautions include: Molten bismuth is at 271°C — severe burn risk; Use heavy-duty heat-resistant gloves; Work on a fireproof surface.
What materials are needed for ビスマス虹色結晶の育成?
The main materials required are: Bismuth metal.
What results should I expect from ビスマス虹色結晶の育成?
Geometric hopper crystals with a distinctive staircase pattern. The thin bismuth oxide layer produces iridescent rainbow colors (pink, blue, gold, green). Crystal size depends on cooling rate — slower cooling produces larger crystals.