chemistry

Hydridonitride

Hydridonitride 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 Hydridonitride rather than just read about it. In short: In chemistry, a hydridonitride (nitridohydride, nitride hydride, or hydride nitride) is a chemical compound that contains both hydride (H−) and nitride (N3−) ions. These inorganic compounds are distinct from inorganic amides and imides as the hydrogen does not share a bond with nitrogen, and usually contain a larger proportion of metals.

Key takeaways

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

Reference excerpt

In chemistry, a hydridonitride (nitridohydride, nitride hydride, or hydride nitride) is a chemical compound that contains both hydride (H−) and nitride (N3−) ions. These inorganic compounds are distinct from inorganic amides and imides as the hydrogen does not share a bond with nitrogen, and usually contain a larger proportion of metals.

Structure The hydride ion H− is stabilised by being surrounded by electropositive elements such as alkalis or alkaline earths. Quaternary compounds exist where nitrogen forms a complex with bonds to a transition or main group element. The hydride requires the presence of another alkaline earth element.

Production Hydridonitrides may be produced by a process called self-propagating high-temperature synthesis (SHS) where a metal nitride is ignited in a hydrogen atmosphere. A metal (Ti, Zr, Hf, Y) can also be ignited in an atmosphere mixing hydrogen and nitrogen, and a hydridonitride is formed exothermically. The molten metal flux technique involves dissolving metal nitrides and hydrides in an excess of molten alkaline earth metal, by heating till everything is molten, and then cooling until crystals form, but the metal is still liquid. Draining the liquid metal (and centrifuging) leaves the crystals of hydridonitride behind. A eutectic molten metal allows it to be cooled more. If liquid alkali metal is used as a flux to grow a hydridonitride crystal, excess metal can be removed using liquid ammonia.

Properties Some hydridonitrides are sensitive to water vapour in air. For non-stoichimetric compounds, as the proportion of hydrogen increases, the unit cell dimensions also increase, so hydrogen is not merely filling holes. When heated to a sufficiently high temperature, hydridonitrides lose hydrogen first to form a metallic nitride or alloy.

Room temperature superconductor

One lutetium hydride doped with nitrogen is claimed to be a room-temperature superconductor at up to 21°C at a pressure of 1 GPa, which is considerably lower than for other polyhydrides. This has been called "red matter" as it is red under high pressure, but blue at ambient conditions. The claim has been met with some skepticism as it was made by the same team that made similar claims retracted by Nature in 2022, claimed observation of solid metallic hydrogen in 2016 as well as other allegations. First attempts to replicate the results have failed. Ashcroft suggested metallic hydrogen could superconduct in 1968 at great pressures and in 2004 similarly that dense group IVa hydrides (as the new material) could also be superconductors at more accessible pressures.

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References

Worked examples

Example 1 — a first encounter with Hydridonitride

Start with the simplest possible case. Write down what Hydridonitride 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 Hydridonitride 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 Hydridonitride 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 Hydridonitride

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

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

Frequently asked questions

What is Hydridonitride in simple terms?

Why does Hydridonitride 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 Hydridonitride?

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 Hydridonitride.