chemistry

Jan Hendrik de Boer

Jan Hendrik de Boer is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jan Hendrik de Boer rather than just read about it. In short: Jan Hendrik de Boer (19 March 1899 – 25 April 1971) was a Dutch physicist and chemist. De Boer was born in Ruinen, De Wolden, and died in The Hague.

Key takeaways

Jan Hendrik de Boer belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Jan Hendrik de Boer to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Jan Hendrik de Boer from memory before moving on to harder problems.

Reference excerpt

Jan Hendrik de Boer (19 March 1899 – 25 April 1971) was a Dutch physicist and chemist. De Boer was born in Ruinen, De Wolden, and died in The Hague. He studied at the University of Groningen and was later employed in industry. Together with Anton Eduard van Arkel, de Boer developed a chemical transport reaction for titanium, zirconium, and hafnium known as the crystal bar process. In a closed vessel the metal reacts with iodine at elevated temperature forming the iodide. At a tungsten filament of 1700 °C the reverse reaction occurs, and the iodine and the metal are set free. The metal forms a solid coating at the tungsten filament and the iodine can react with additional metal, resulting in a steady turnover.

M + 2I2 (>400 °C) → MI4 MI4 (1700 °C) → M + 2I2 This process is now known as Van Arkel–de Boer process. However, in 1937 De Boer and Evert Verwey reported that many transition-metal oxides (such as NiO) with a partially filled d-band were poor conductors, often insulating. This led to the concept of metal–insulator transition. In 1940, De Boer became a member of the Royal Netherlands Academy of Arts and Sciences, and foreign member in 1947.

References

Illustrations

Worked examples

Example 1 — a first encounter with Jan Hendrik de Boer

Start with the simplest possible case. Write down what Jan Hendrik de Boer claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jan Hendrik de Boer before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jan Hendrik de Boer ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jan Hendrik de Boer

In research: Jan Hendrik de Boer appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Jan Hendrik de Boer in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Jan Hendrik de Boer is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1899 births, 1971 deaths, 20th-century Dutch chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Jan Hendrik de Boer outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Jan Hendrik de Boer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Jan Hendrik de Boer means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Jan Hendrik de Boer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jan Hendrik de Boer in simple terms?

Jan Hendrik de Boer (19 March 1899 – 25 April 1971) was a Dutch physicist and chemist. De Boer was born in Ruinen, De Wolden, and died in The Hague.

Why does Jan Hendrik de Boer matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jan Hendrik de Boer?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jan Hendrik de Boer.