chemistry

Gadolinium(III) oxide

Gadolinium(III) oxide 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 Gadolinium(III) oxide rather than just read about it. In short: Gadolinium(III) oxide (archaically gadolinia) is an inorganic compound with the formula Gd2O3. It is one of the most commonly available forms of the rare-earth element gadolinium, derivatives, of which are potential contrast agents for magnetic resonance imaging.

Key takeaways

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

Reference excerpt

Gadolinium(III) oxide (archaically gadolinia) is an inorganic compound with the formula Gd2O3. It is one of the most commonly available forms of the rare-earth element gadolinium, derivatives, of which are potential contrast agents for magnetic resonance imaging.

Structure

Gadolinium oxide adopts two structures. The cubic (cI80, Ia3), No. 206) structure is similar to that of manganese(III) oxide and heavy trivalent lanthanide sesquioxides. The cubic structure features two types of gadolinium sites, each with a coordination number of 6 but with different coordination geometries. The second polymorph is monoclinic (Pearson symbol mS30, space group C2/m, No. 12). At room temperature, the cubic structure is more stable. The phase change to the monoclinic structure takes place at 1200 °C. Above 2100 °C to the melting point at 2420 °C, a hexagonal phase dominates.

Preparation and chemistry Gadolinium oxide can be formed by thermal decomposition of the hydroxide, nitrate, carbonate, or oxalate. Gadolinium oxide forms on the surface of gadolinium metal. Gadolinium oxide is a rather basic oxide, indicated by its ready reaction with carbon dioxide to give carbonates. It dissolves readily in the common mineral acids with the complication that the oxalate, fluoride, sulfate and phosphate are very insoluble in water and may coat the grains of oxide, thereby preventing the complete dissolution.

Nanoparticles of Gd2O3 Several methods are known for the synthesis of gadolinium oxide nanoparticles, mostly based on precipitation of the hydroxide by the reaction of gadolinium ions with hydroxide, followed by thermal dehydration to the oxide. The nanoparticles are always coated with a protective material to avoid the formation of larger polycrystalline aggregates. Nanoparticles of gadolinium oxide is a potential contrast agent for magnetic resonance imaging (MRI). A dextran-coated preparation of 20–40 nm sized gadolinium oxide particles had a relaxivity of 4.8 s−1mM−1 per gadolinium ion at 7.05 T (an unusually high field compared to the clinically used MRI scanners which mostly range from 0.5 to 3 T). Smaller particles, between 2 and 7 nm, were tested as an MRI agent.

Potential applications Gadolinium(III) oxide is a host material in some solid-state lasers. Doped with rare-earth ions such as neodymium or erbium, Gd2O3 can produce lasers with high efficiency and specific wavelengths, which are important in various applications, including telecommunications and medical procedures. Gd2O3 is used in some solid oxide fuel cells (SOFCs).

References

Illustrations

Worked examples

Example 1 — a first encounter with Gadolinium(III) oxide

Start with the simplest possible case. Write down what Gadolinium(III) oxide 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 Gadolinium(III) 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 Gadolinium(III) 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 Gadolinium(III) oxide

In research: Gadolinium(III) oxide 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 Gadolinium(III) 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: Gadolinium(III) oxide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Crystals in space group 12, Crystals in space group 206, Gadolinium compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Gadolinium(III) 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 Gadolinium(III) oxide in 20 minutes

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

Frequently asked questions

What is Gadolinium(III) oxide in simple terms?

Why does Gadolinium(III) oxide 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 Gadolinium(III) 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 Gadolinium(III) oxide.