science

Mixed oxide

Mixed oxide is a science 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 Mixed oxide rather than just read about it. In short: In chemistry, a mixed oxide is a somewhat informal name for an oxide that contains cations of more than one chemical element or cations of a single element in several states of oxidation. The term is usually applied to solid ionic compounds that contain the oxide anion O2− and two or more element cations.

Key takeaways

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

Reference excerpt

In chemistry, a mixed oxide is a somewhat informal name for an oxide that contains cations of more than one chemical element or cations of a single element in several states of oxidation. The term is usually applied to solid ionic compounds that contain the oxide anion O2− and two or more element cations. Typical examples are ilmenite (FeTiO3), a mixed oxide of iron (Fe2+) and titanium (Ti4+) cations, perovskite and garnet.The cations may be the same element in different ionization states: a notable example is magnetite Fe3O4, which is also known as ferrosoferric oxide , contains the cations Fe2+ ("ferrous" iron) and Fe3+ ("ferric" iron) in 1:2 ratio. Other notable examples include red lead Pb3O4, the ferrites, and the yttrium aluminum garnet Y3Al5O12, used in lasers. The term is sometimes also applied to compounds of oxygen and two or more other elements, where some or all of the oxygen atoms are covalently bound into oxyanions. In sodium zincate Na2ZnO2, for example, the oxygens are bound to the zinc atoms forming zincate anions. (On the other hand, strontium titanate SrTiO3, despite its name, contains Ti4+ cations and not the TiO2−3 anion.) Sometimes the term is applied loosely to solid solutions of metal oxides rather than chemical compounds, or to fine mixtures of two or more oxides. Mixed oxide minerals are plentiful in nature. Synthetic mixed oxides are components of many ceramics with remarkable properties and important advanced technological applications, such as strong magnets, fine optics, lasers, semiconductors, piezoelectrics, superconductors, catalysts, refractories, gas mantles, nuclear fuels, and more. Piezoelectric mixed oxides, in particular, are extensively used in pressure and strain gauges, microphones, ultrasound transducers, micromanipulators, delay lines, etc.

See also Complex oxide Double salt MOX fuel

References

Worked examples

Example 1 — a first encounter with Mixed oxide

Start with the simplest possible case. Write down what Mixed oxide claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Mixed oxide 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 Mixed oxide 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 Mixed oxide

In research: Mixed oxide appears in science 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 Mixed oxide 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: Mixed oxide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Oxides, so understanding it makes those chapters shorter.
In everyday life: Look for Mixed oxide 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 Mixed oxide in 20 minutes

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

Frequently asked questions

What is Mixed oxide in simple terms?

Why does Mixed oxide matter?

Because it connects several science 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 Mixed oxide?

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 Mixed oxide.