chemistry

Zinc cadmium phosphide arsenide

Zinc cadmium phosphide arsenide 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 Zinc cadmium phosphide arsenide rather than just read about it. In short: Zinc cadmium phosphide arsenide (Zn-Cd-P-As) is a quaternary system of group II (IUPAC group 12) and group V (IUPAC group 15) elements. Many of the inorganic compounds in the system are II-V semiconductor materials.

Key takeaways

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

Reference excerpt

Zinc cadmium phosphide arsenide (Zn-Cd-P-As) is a quaternary system of group II (IUPAC group 12) and group V (IUPAC group 15) elements. Many of the inorganic compounds in the system are II-V semiconductor materials. The quaternary system of II3V2 compounds, (Zn1−xCdx)3(P1−yAsy)2, has been shown to allow solid solution continuously over the whole compositional range. This material system and its subsets have applications in electronics, optoelectronics, including photovoltaics, and thermoelectrics.

List of all binary compounds This system of elements contains numerous binary compounds and their solid solutions.

Stable at atmospheric pressure The binary compounds thermodynamically stable at atmospheric pressure are listed in the following table:

Metastable or unstable at atmospheric pressure Compounds metastable or unstable at atmospheric pressure are the following:

Quaternary compounds The compounds of the form II3V2 have similar crystalline structures and exhibit full solid solution over the whole compositional range. The compounds of the form II-V2 allow only partial solid solution.

Ternary compounds The binary compounds in this system form a wide range of solid solutions. This miscibility reflects the close similarity of the structures of the binary phases. The IIV2 compounds exhibit wide solid solution ranges with CdP4 even though the stoichiometry and structures of the components differ. The optoelectronic and band properties of some ternary compounds have also been studied. For example, the bandgap of Zn3(P1−yAsy)2 solid solutions is direct and tunable from 1.0 eV to 1.5 eV. This solubility enables the fabrication of tunable nanowire photodetectors. The solid solution (Zn1−xCdx)3As2 exhibit a topological phase transition at x ~ 0.62.

Notable binary compounds

Cadmium arsenide (Cd3As2)

Cadmium arsenide is a 3D Dirac semimetal exhibiting the Nernst effect.

Zinc phosphide (Zn3P2)

Zinc phosphide is a semiconductor material with a direct band gap of 1.5 eV used in photovoltaics. It is also used as a rodenticide in the pest control industry.

Zinc arsenide (Zn3As2)

Zinc arsenide is a semiconductor material with a band gap of 1.0 eV.

References

External links

Worked examples

Example 1 — a first encounter with Zinc cadmium phosphide arsenide

Start with the simplest possible case. Write down what Zinc cadmium phosphide arsenide 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 Zinc cadmium phosphide arsenide 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 Zinc cadmium phosphide arsenide 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 Zinc cadmium phosphide arsenide

In research: Zinc cadmium phosphide arsenide 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 Zinc cadmium phosphide arsenide 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: Zinc cadmium phosphide arsenide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arsenides, Cadmium compounds, II-V compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Zinc cadmium phosphide arsenide 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 Zinc cadmium phosphide arsenide in 20 minutes

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

Frequently asked questions

What is Zinc cadmium phosphide arsenide in simple terms?

Why does Zinc cadmium phosphide arsenide 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 Zinc cadmium phosphide arsenide?

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 Zinc cadmium phosphide arsenide.