chemistry

Tin telluride

Tin telluride 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 Tin telluride rather than just read about it. In short: Tin telluride is a compound of tin and tellurium (SnTe); is a IV-VI narrow band gap semiconductor and has direct band gap of 0.18 eV. It is often alloyed with lead to make lead tin telluride, which is used as an infrared detector material.

Key takeaways

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

Reference excerpt

Tin telluride is a compound of tin and tellurium (SnTe); is a IV-VI narrow band gap semiconductor and has direct band gap of 0.18 eV. It is often alloyed with lead to make lead tin telluride, which is used as an infrared detector material. Tin telluride normally forms p-type semiconductor (Extrinsic semiconductor) due to tin vacancies and is a low temperature superconductor. SnTe exists in three crystal phases. At Low temperatures, where the concentration of hole carriers is less than 1.5 × 1020 cm−3 , Tin Telluride exists in rhombohedral phase also known as α-SnTe. At room temperature and atmospheric pressure, Tin Telluride exists in NaCl-like cubic crystal phase, known as β-SnTe. While at 18 kbar pressure, β-SnTe transforms to γ-SnTe, orthorhombic phase, space group Pnma. This phase change is characterized by 11 percent increase in density and 360 percent increase in resistance for γ-SnTe. Tin telluride is a thermoelectric material. Theoretical studies imply that the n-type performance may be particularly good.

Thermal properties Standard enthalpy of formation: - 14.6 ± 0.3 kcal/mole at 298 K Standard Enthalpy of sublimation: 52.1 ± 1.4 kcal/mole at 298 K Heat capacity: 12.1 + 2.1 × 10−3 T cal/deg Bond-dissociation energy for the reaction SnTe(g)-> Sn(g)+ Te(g) : 80.6 ± 1.5 kcal/mole at 298 K Entropy: 24.2±0.1 cal/mole.deg Enthalpy of Dimerization for the reaction Sn2Te2->2SnTe(g) :46.9 ± 6.0 kcal/mole

Applications Generally Pb is alloyed with SnTe in order to access interesting optical and electronic properties, In addition, as a result of Quantum confinement, the band gap of the SnTe increases beyond the bulk band gap, covering the mid-IR wavelength range. The alloyed material has been used in mid- IR photodetectors and thermoelectric generator.

References

External links Berlin thermophysical properties database Webelements page Landolt-Börnstein Substance/SnTe index Reflectivity of Tin Telluride in the Infrared

Illustrations

Worked examples

Example 1 — a first encounter with Tin telluride

Start with the simplest possible case. Write down what Tin telluride 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 Tin telluride 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 Tin telluride 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 Tin telluride

In research: Tin telluride 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 Tin telluride 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: Tin telluride is common in secondary-school and first-year university syllabi. It links to neighbouring topics IV-VI semiconductors, Rock salt crystal structure, Tellurides, so understanding it makes those chapters shorter.
In everyday life: Look for Tin telluride 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 Tin telluride in 20 minutes

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

Frequently asked questions

What is Tin telluride in simple terms?

Why does Tin telluride 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 Tin telluride?

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 Tin telluride.