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Promethium(III) oxide

chemical compound

Specimen drawers, botanical folios and brass scientific instruments under study light
Science and natureInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionJul 5, 2025
Entity authorityQ421194 ↗
Source-derived summary

Promethium(III) oxide is a compound with the formula Pm2O3. It is the most common form of promethium.

Crystal structure

Promethium oxide exists in three major crystalline forms:

*a, b and c are lattice parameters, Z is the number of formula units per unit cell, density is calculated from X-ray data.

The low-temperature cubic form converts to the monoclinic structure upon heating to 750–800 °C, and this transition can only be reversed by melting the oxide.

Editorial summary

“Promethium(III) oxide” enters the record as chemical compound. Crown Archives preserves that source wording while asking what Promethium, oxide and chemical can confirm, complicate or overturn.

Editorial reviewUseful for establishing the present vocabulary of the subject while preserving a route back to the evidence on which that vocabulary rests. The current 75-word lead offers orientation but no explicit four-digit date, so chronology should not be assumed. The selected authority fields contribute no independent date. Its strongest next move is a source search built around Promethium, oxide and chemical.
Editorial analysis

Why this record matters

“Promethium(III) oxide” is worth following because a concise public description often conceals a longer documentary argument. Here, Promethium, oxide and chemical provides the most credible route into that argument.

Evidence profile

Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Jul 5, 2025. The linked authority identifier is Q421194. None of the 0 selected statements returned an explicit reference.

Critical limits

A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

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Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.

Three-step research path

  1. Establish the record: confirm the title “Promethium(III) oxide”, its source revision and the description used here.
  2. Expand the search: follow Promethium(III) oxide primary sources, Promethium(III) oxide archive and Promethium research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

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Source & attribution

This entry incorporates text from “Promethium(III) oxide” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.