iron oxychloride

FeOCl identity

Use FeOCl as the working interpretation of iron oxychloride, consistent with the material identified in [primary research on FeOCl](https://pubs.acs.org/doi/10.1021/acs.est.1c04370); separately verify that this matches the registry's intent.

1. Does the registry denote stoichiometric iron(III) oxychloride FeOCl or a broader class of iron oxychloride materials? definition
2. Which original registry reference and authoritative chemical records establish the intended identity and identifiers? provenance

Single phase versus mixture

Require complementary elemental and phase evidence before interpreting a chloride-containing iron solid as FeOCl.

1. What Fe:O:Cl ratios and diffraction results support the identification, with what uncertainties and detection limits? measurement
2. Could the observations instead arise from iron oxide mixed with iron chloride or a chloride-bearing iron oxyhydroxide? boundary

Layer and particle evidence

FeOCl is used as a layered scaffold in [intercalation research](https://pubmed.ncbi.nlm.nih.gov/35119845/); assess the actual sample's structure rather than assuming a bulk reference describes every powder or thin layer.

1. Which reference structure and indexed reflections support the phase assignment and measured layer spacing? provenance
2. What are the particle thickness, lateral dimensions, crystallinity and accessible surface area? measurement

Modified host boundary

Record guest identity, loading and structural retention before assigning host properties to an intercalated sample.

1. Which guest species are present, at what loading, and what evidence distinguishes intercalation from surface adsorption? measurement
2. Does the material retain a recognizable FeOCl host, or has modification produced a distinct phase or composite requiring a linked model? boundary

Residual chloride and oxide

Separate the FeOCl fraction from residual iron chlorides, oxides, adsorbed water and other detected constituents.

1. What analytical evidence quantifies FeOCl purity, soluble chloride residues, oxide impurities and water content? measurement
2. Which preparation, washing and drying records explain the batch's measured impurity profile? provenance

Phase retention and release

Treat hydrolysis, chloride release and thermal transformation as questions requiring condition-specific evidence; hydrolysis to an oxyhydroxide is discussed in [experimental work on FeOCl transformations](https://www.sciencedirect.com/science/article/abs/pii/S1293255813000204).

1. After exposure at the stated temperature, humidity or solution pH and duration, which phases remain and how much iron or chloride enters solution? measurement
2. What measured change should trigger reclassification, recharacterization or rejection for the intended use? action

Catalytic attribution

Evaluate peroxide-activation claims with explicit solution conditions and attribution evidence, following the scrutiny motivated by [FeOCl as a Fenton-catalyst case study](https://pubs.acs.org/doi/10.1021/acs.est.1c04370).

1. At what pH, temperature, FeOCl loading and peroxide concentration were reaction rates and products measured? measurement
2. Which controls distinguish adsorption, dissolved-iron activity and impurity effects from activity attributable to the FeOCl solid? boundary

Insertion versus conversion

Require mechanism and phase evidence when assessing FeOCl as an ion-storage host; distinguish retained-host behavior from irreversible transformation.

1. Which ions, electrolyte, potential reference, voltage window and mass basis define the reported capacity and cycling results? measurement
2. What structural and chemical evidence distinguishes reversible guest insertion from conversion or decomposition? boundary

Thermal and solution property meaning

Do not interpret a thermal event as melting or a solution concentration as equilibrium solubility without establishing the underlying process.

1. Which density, thermal-event and dissolution measurements apply to characterized FeOCl, and under what pressure, atmosphere or solvent conditions? measurement
2. Does each reported thermal or solution result represent a physical transition, dissolution, hydrolysis or decomposition? definition

Identity-matched safety record

Keep classification, exposure-limit applicability and handling decisions unresolved until supported by records for the relevant identity, grade and jurisdiction.

1. Which current SDS or authoritative record matches this FeOCl identity and grade, and what classification or exposure limits does it actually establish? provenance
2. Given the documented hazards, particle form and contamination state, what storage, containment and disposal actions are appropriate? action

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these check these first hold for the sense of iron oxychloride this model covers, and on what evidence? provenance

Identifiers and schemes

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these identifiers and schemes hold for the sense of iron oxychloride this model covers, and on what evidence? provenance

Real-world use

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these real-world use hold for the sense of iron oxychloride this model covers, and on what evidence? provenance

Typical measurements

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these typical measurements hold for the sense of iron oxychloride this model covers, and on what evidence? provenance

Failure modes and hazards

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these failure modes and hazards hold for the sense of iron oxychloride this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of iron oxychloride this model covers, and on what evidence? provenance