chemistry

Samarium(III) fluoride

Samarium(III) fluoride 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 Samarium(III) fluoride rather than just read about it. In short: Samarium(III) fluoride (SmF3) is a slightly hygroscopic solid fluoride. Conditions/substances to avoid are: open flame, moisture, strong acids.

Key takeaways

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

Reference excerpt

Samarium(III) fluoride (SmF3) is a slightly hygroscopic solid fluoride. Conditions/substances to avoid are: open flame, moisture, strong acids.

Preparation Samarium(III) fluoride can be obtained by reacting SmCl3 or Sm2(CO3)3 with 40% hydrofluoric acid:

SmCl3 + 3 HF → SmF3↓ + 3 HCl Sm2(CO3)3 + 6 HF → 2 SmF3 + 3 H2O + 3 CO2↑ Samarium(III) fluoride can also be produced by hydrothermal reaction of samarium nitrate and sodium fluroborate at 200 °C.

Properties

Chemical Samarium(III) fluoride reacts with some reducing agents at high temperatures to obtain samarium(II) fluoride:

4 S m F 3 + C → 2000 o C 4 S m F 2 + C F 4 {\displaystyle {\mathsf {4SmF_{3}+C\ {\xrightarrow {2000^{o}C}}\ 4SmF_{2}+CF_{4}}}}

2 S m F 3 + S m → 1800 o C 3 S m F 2 {\displaystyle {\mathsf {2SmF_{3}+Sm\ {\xrightarrow {1800^{o}C}}\ 3SmF_{2}}}}

Physical At room temperature, samarium(III) fluoride has orthorhombic structure with space group Pnma – β-YF3 type with lattice constants a = 666,9 pm, b = 705,9 pm, c = 440,5 pm. Above 495 °C, it has the rhombohedral LaF3 structure (space group P3cl) – with lattice constants a = 707, c = 724 pm.

References

Illustrations

Worked examples

Example 1 — a first encounter with Samarium(III) fluoride

Start with the simplest possible case. Write down what Samarium(III) fluoride 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 Samarium(III) fluoride 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 Samarium(III) fluoride 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 Samarium(III) fluoride

In research: Samarium(III) fluoride 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 Samarium(III) fluoride 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: Samarium(III) fluoride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fluorides, Lanthanide halides, Samarium(III) compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Samarium(III) fluoride 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 Samarium(III) fluoride in 20 minutes

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

Frequently asked questions

What is Samarium(III) fluoride in simple terms?

Samarium(III) fluoride (SmF3) is a slightly hygroscopic solid fluoride. Conditions/substances to avoid are: open flame, moisture, strong acids.

Why does Samarium(III) fluoride 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 Samarium(III) fluoride?

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 Samarium(III) fluoride.