chemistry

Zirconium phosphate

Zirconium phosphate 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 Zirconium phosphate rather than just read about it. In short: Zirconium phosphates (zirconium hydrogen phosphate) are acidic, inorganic cation exchange materials that have a layered structure with formula Zr(HPO4)2∙nH2O. These salts have high thermal and chemical stability, solid state ion conductivity, resistance to ionizing radiation, and the capacity to incorporate different types of molecules with different sizes between their layers.

Key takeaways

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

Reference excerpt

Zirconium phosphates (zirconium hydrogen phosphate) are acidic, inorganic cation exchange materials that have a layered structure with formula Zr(HPO4)2∙nH2O. These salts have high thermal and chemical stability, solid state ion conductivity, resistance to ionizing radiation, and the capacity to incorporate different types of molecules with different sizes between their layers. There are various phases of zirconium phosphate which vary in their interlaminar spaces and their crystalline structure. Among all the Zirconium phosphate phases the most widely used are the alpha (Zr(HPO4)2∙H2O) and the gamma (Zr(PO4)(H2PO4)∙2H2O) phase. The salts have been widely used in several applications such as: drug delivery, catalysis, nanocomposite, nuclear waste management, clinical dialyzer, among others.

Crystal structure

Zirconium phosphate crystal structure was elucidated by Clearfield and coworkers in 1968 by the single-crystal method. The layered structure of α-Zirconium phosphate consists of Zr(IV) ions situated alternately slightly above and below the ab plane, forming an octahedron with the oxygen atoms of the tetrahedral phosphate groups. Of the four oxygen atoms in the phosphate groups, three are bonded to three different Zr atoms, forming a cross-linked covalent network. The fourth oxygen atom of the phosphate is perpendicular to the layer pointed toward the interlayer region. In the interlayer region is localized a zeolitic cavity where a basal water molecule resides, forming a hydrogen bond with the OH group of the phosphate that is perpendicular to the layer. The alpha phase of zirconium phosphate is under the P21/n space group, with cell dimensions of a = 9.060 Å, b = 5.297 Å, c = 15.414 Å, α = γ = 90°, β = 101.71° and Z = 4.21 The basal interlayer distance for the α-Zirconium phosphate is 7.6 Å, where 6.6 Å is the layer thickness and the remaining 1 Å space is occupied by the interstitial water molecules in the interlayer gallery. The distance between adjacent orthophosphates on one side of the layer is 5.3 Å. There are two phosphates in each ab plane in the surface layer forming a “free area” of 24 Å2 associated to each phosphate group. For the gamma phase (γ-Zirconium phosphate), an appropriate single crystal for single-crystal structure determination has yet to be obtained. In 1995 Clearfield and coworkers elucidated its structure using X-ray powder diffractometry (XRPD) and the Rietveld refinement method. The structure of γ-Zirconium phosphate consists of Zr(IV) atoms octahedrally coordinated to four different oxygen atoms of an orthophosphate. The other two resting octahedral position of the Zr(IV) atoms are occupied by two different dihydrogen phosphate groups. The orthophosphate molecules are located alternatively above and below the ab main plane and the dihydrogen phosphates are in the layer edges crosslinked by two of their oxygen atoms to two different zirconium atoms. The remaining two hydroxyl groups of the dihydrogen phosphate are pointing toward the interlayer gallery forming a pocket where a hydrogen bond is formed with the interlayer water molecules. The basal interlayer distance for γ-Zirconium phosphate is 12.2 Å, and the area surrounding the dihydrogen phosphate on the surface of the layers is 35 Å2.

References

External links

MSDS (Material Safety Data Sheet) Archived 2011-09-12 at the Wayback Machine

Worked examples

Example 1 — a first encounter with Zirconium phosphate

Start with the simplest possible case. Write down what Zirconium phosphate 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 Zirconium phosphate 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 Zirconium phosphate 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 Zirconium phosphate

In research: Zirconium phosphate 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 Zirconium phosphate 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: Zirconium phosphate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Phosphates, Zirconium(IV) compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Zirconium phosphate 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 Zirconium phosphate in 20 minutes

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

Frequently asked questions

What is Zirconium phosphate in simple terms?

Why does Zirconium phosphate 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 Zirconium phosphate?

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 Zirconium phosphate.