chemistry

Lithium nitride

Lithium nitride 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 Lithium nitride rather than just read about it. In short: Lithium nitride is an inorganic compound with the chemical formula Li3N. It is the only stable alkali metal nitride.

Key takeaways

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

Reference excerpt

Lithium nitride is an inorganic compound with the chemical formula Li3N. It is the only stable alkali metal nitride. It is a reddish-pink solid with a high melting point.

Preparation and handling Lithium nitride is prepared by direct reaction of elemental lithium with nitrogen gas:

6 Li + N2 → 2 Li3N Instead of burning lithium metal in an atmosphere of nitrogen, a solution of lithium in liquid sodium metal can be treated with N2. Lithium nitride is an extremely strong base, so it must be protected from moisture as it reacts violently with water to produce ammonia:

Li3N + 3 H2O → 3 LiOH + NH3

Structure and properties alpha-Li3N (stable at room temperature and pressure) has an unusual crystal structure that consists of two types of layers: one layer has the composition Li2N− contains 6-coordinate N centers and the other layer consists only of lithium cations. Two other forms are known:

beta-Li3N, formed from the alpha phase at 0.42 GPa has the sodium arsenide (Na3As) structure; gamma-Li3N (same structure as lithium bismuthide Li3Bi) forms from the beta form at 35 to 45 GPa. Lithium nitride shows ionic conductivity for Li+, with a value of c. 2×10−4 Ω−1cm−1, and an (intracrystal) activation energy of c. 0.26 eV (c. 24 kJ/mol). Hydrogen doping increases conductivity and doping with metal ions (Al, Cu, Mg) reduces it. The activation energy for lithium transfer across lithium nitride crystals (intercrystalline) has been determined to be higher, at c. 68.5 kJ/mol. The alpha form is a semiconductor with band gap of c. 2.1 eV.

Reactions Reacting lithium nitride with carbon dioxide results in amorphous carbon nitride (C3N4), a semiconductor, and lithium cyanamide (Li2CN2), a precursor to fertilizers, in an exothermic reaction. Under hydrogen at around 200°C, Li3N will react to form lithium amide.

Li3N + 2 H2 → 2LiH + LiNH2 At higher temperatures it will react further to form ammonia and lithium hydride.

LiNH2 + H2 → LiH + NH3 Lithium imide can also be formed under certain conditions. Some research has explored this as a possible industrial process to produce ammonia since lithium hydride can be thermally decomposed back to lithium metal. Lithium nitride has been investigated as a storage medium for hydrogen gas, as the reaction is reversible at 270 °C. Up to 11.5% by weight absorption of hydrogen has been achieved.

References

Illustrations

Worked examples

Example 1 — a first encounter with Lithium nitride

Start with the simplest possible case. Write down what Lithium nitride 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 Lithium nitride 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 Lithium nitride 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 Lithium nitride

In research: Lithium nitride 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 Lithium nitride 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: Lithium nitride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Inorganic compound stubs, Lithium compounds, Nitrides, so understanding it makes those chapters shorter.
In everyday life: Look for Lithium nitride 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 Lithium nitride in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lithium nitride 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 Lithium nitride out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lithium nitride in simple terms?

Lithium nitride is an inorganic compound with the chemical formula Li3N. It is the only stable alkali metal nitride.

Why does Lithium nitride 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 Lithium nitride?

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 Lithium nitride.