chemistry

Nitridosilicate

Nitridosilicate 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 Nitridosilicate rather than just read about it. In short: The nitridosilicates are chemical compounds that have anions with nitrogen bound to silicon. Counter cations that balance the electric charge are mostly electropositive metals from the alkali metals, alkaline earths or rare earth elements.

Key takeaways

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

Reference excerpt

The nitridosilicates are chemical compounds that have anions with nitrogen bound to silicon. Counter cations that balance the electric charge are mostly electropositive metals from the alkali metals, alkaline earths or rare earth elements. Silicon and nitrogen have similar electronegativities, so the bond between them is covalent. Nitrogen atoms are arranged around a silicon atom in a tetrahedral arrangement. Related compounds include pnictogenidosilicates :phosphidosilicates, arsenidosilicates and antimonosilicates; pnictogenidogernamates: phosphidogermanates. By replacing silicon, there are also nitridogermanates, nitridostannates, nitridotantalates and nitridotitanates.

Use Nitridosilicates are used as host substances for europium in LED phosphors. Examples include CASN (calcium aluminium silicide nitride) (CaAlSiN3), SCASN (SrCaAlSiN3) and SCSN (SrCaSiN3). These fluoresce red.

Production Nitridosilicates can be made in a solid state reaction by heating silicon nitride with metallic nitrides in a nitrogen atmosphere at over 1300 °C. If the mixtures are exposed to oxygen or air, then oxides or oxynitridosilicates are produced instead. Instead of metal nitrides, ammine complexes, amides or imides can be used instead. In place of the highly stable silicon nitride, silicon diimide can be used. Carbothermal reduction involves using a metal oxide or carbonate heated with carbon in a nitrogen atmosphere.

Properties The ratio of silicon to nitrogen varies from 1:4 to 7:10 (0.25 to 0.7) with increased condensation, and fewer sites for metals with high silicon content. At a ratio of 3:4 (0.75) there is no longer capacity for metal, as that is silicon nitride. The more condensed substances, with lower nitrogen content, have greater number of silicon atoms surrounding the nitrogen. This coordination number can vary from one to four, with the most common being three. The silicon atom always is coordinated by four nitrogen atoms. In the silicates, silicon is surrounded by four oxygen atoms, but each oxygen is only connected to one or two silicon atoms, and only very rarely three. So nitridosilicates can form more diverse structures than the silicates. Nitridosilicates with higher proportion of silicon (more condensed) are more resistant to attack by water and oxygen, and so can be exposed to the atmosphere without decomposition. These condensed nitridosilicates are mechanically strong, and resistant to heat, acids and alkalis. SiN4 tetrahedra can be connected to each other via vertices or edges. This differs from SiO4 which only connects via vertices.

Use Nitridosilicates have been used to make abrasives, turbine blades, cutting tools and phosphors.

Nitridosilicates

References

Worked examples

Example 1 — a first encounter with Nitridosilicate

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

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

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

Frequently asked questions

What is Nitridosilicate in simple terms?

Why does Nitridosilicate 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 Nitridosilicate?

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 Nitridosilicate.