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Chromium(III) Iodide (CrI3) Powder and Crystals

CAS Number 13569-75-0

2D Semiconductor Materials, Low Dimensional Materials


Product Code M2323A10
Price $650 ex. VAT

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Low price, high purity 2D metal chromium(III) iodide powder and crystal

For the development of next-generation electronics, optoelectronics, and nanotechnology


Chromium(III) iodide (also known as chromium triiodide CrI3) belongs to a rare group of layered transition metal trichalcogenides (TMTCs) ferromagnetic semiconductors. Unlike chromium trichloride which shows a 2D-Heisenberg magnetic behaviour, CrI3 exhibits stronger magnetic anisotropy promoting a 3D magnetic characteristic with larger van der Waals gap thus smaller cleavage energy.

The magnetic properties of CrI3 are the layer thickness and stacking order dependent. Bulk CrI3 is ferromagnetic (FM) with a Curie temperature of 61 K and a rhombohedral layer stacking, while few-layer CrI3 has a layered antiferromagnetic (AFM) phase with a lower ordering temperature of 45 K and a monoclinic stacking.

high purity 13569-75-0

High purity

High purity ≥99.995% Powder

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Low Cost Chromium(III) Iodide (CrI3)

Low Cost

Competitively priced CrI3

Single or few-layer Chromium(III) Iodide

Single or few-layer

Can be used to produce single or few-layer sheets

Changing the spin direction of CrI3 via an external field can significantly alter the electronic band structures, including a direct-to-indirect bandgap transition, Fermi surface and topological electronic states modification. Direct-to-indirect bandgap transition can be used to develop magneto-optoelectronic device where the photoconductivity can be switched by an external magnetic field.

We supply low price chromium(III) iodide in several different forms for a range of applications.

Chromium(III) iodide Powder

Chromium(III) Iodide Powder

Can be used for preparation of chromium(III) iodide nanoplates and ultrathin films

Sold by weight

≥99.995% purity

From £500

Chromium(III) iodide crystal

Chromium(III) Iodide Crystals by Size

Can be used to produce single or few-layer chromium(III) iodide sheets via mechanical or liquid exfoliation

Small (≥10 mm2) or medium (≥25 mm2) crystals available*

≥99.999% purity

From £520

*Typical representative size, areas/dimensions may vary

Bulk single chromium(III) iodide crystal is most commonly used as sources from which single or few-layer sheets can be obtained via either mechanical or liquid exfoliation. 

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Chromium(III) iodide powder can also be used to prepare CrI3 nanosheets and nanoparticles by liquid-exfoliation (normally assisted by sonication). 

Key Product Data

Structure of Chromium(III) Iodide

Single crystals of chromium(III) iodide is a layered and easily cleavable insulating ferromagnet with Curie temperature of 61 K. The structure at low temperature is rhombohedral (R3, BiI3 -type) and the high temperature structure is monoclinic (C2/m, AlCl3 -type).

Chromium(III) iodide crystal structure layers

The Pristine monolayer CrIexhibits a small trigonal distortion of the CrI6 octahedron, with the edge-shared CrI6 octahedra forming a honeycomb lattice of six Cr atoms.

Top and side view of single-layer chromium(III) iodide
Top and side view of single-layer chromium(III) iodide.

Properties of Chromium(III) Iodide

After exfoliation of crystals or powder, chromium(III) iodide typically has the following properties:

  • CrI3 exhibits strong magnetic anisotropy.
  • Few-layer CrI3 has a layered antiferromagnetic (AFM) phase with a lower ordering temperature of 45 K and a monoclinic stacking.
  • Monolayer CrI3 has been confirmed to be an intrinsic 2D Ising ferromagnetic (FM) material with a suitable band gap of about 1.2 eV.
  • The ferromagnetic and antiferromagnetic states can be switched on and off by changing the external gate voltage.

Chromium(III) Iodide Applications

Chromium(III) iodide single crystals can be used to prepare monolayer and few-layer CrI3 by mechanical or liquid exfoliation. Chromium(III) iodide powder is suitable for liquid chemical exfoliation to prepare CrI3 nanosheets and nanoparticles down to few-layer films. 

2D CrI3 is a promising candidate for the van der Waals bonded ferromagnetic devices since its ferromagnetism can be maintained upon exfoliating of bulk crystals down to its single layer.

Being a ferromagnetic semiconductors exhibiting stronger magnetic anisotropy, Layered 2D CrI3 is predicted to have many potential applications such as magnetoresistance, magnetic photo-galvanic and magneto–optical effects. With large out-of-plane magnetic anisotropy energy and strong magneto-optical effects in these single-spin ferromagnetic semiconducting ultrathin films, CrI3 finds applications in high density semiconductor magneto–optical and low-power spintronic nanodevices.

Intercalated chromium(III) iodide with Li ions can not only tune the semiconducting ultrathin CrI3 into half-metallic, but can also largely improve the Curie temperature (TC) and the magnetic moment simultaneously. Half-metallicity and ferromagnetism are rather robust, dependent of neither the concentration of Li ions adsorbed, nor the layer thickness of CrI3. Self-intercalation with either Cr or I atoms can induce the double exchange effect and significantly strengthen the interlayer ferromagnetic coupling for potential electronic and spintronic applications.

Processing Chromium Iodide

Viscoelastic transfer using PDMS

Literature and Reviews

  • Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit, B. Huang et al., Nature 546, 270–273 (2017), DOI: 10.1038/nature22391.
  • On the origin of magnetic anisotropy in two dimensional CrI3, J. Lado et al., 2D Mater. 4, 035002 (2017); DOI: 10.1088/2053-1583/aa75ed.
  • Critical behavior of two-dimensional intrinsically ferromagnetic semiconductor CrI3, G. Lin et al., Appl. Phys. Lett. 112, 072405 (2018); DOI: 10.1063/1.5019286.
  • Spin direction controlled electronic band structure in two dimensional ferromagnetic CrI3, P. Jiang et al., Nano Lett., 18, 6, 3844–3849 (2018); DOI: 10.1021/acs.nanolett.8b01125.
  • Lattice dynamics and phase transition in CrI3 single crystals, S. Djurdjic-Mijin et al., Phys. Rev. B, 98, 104307 (2018); DOI: 10.1103/PhysRevB.98.104307.
  • Stacking-Dependent Magnetism in Bilayer CrI3, N. Sivadas et al., Nano Lett., 18, 12, 7658–7664 (2018); DOI: 10.1021/acs.nanolett.8b03321.
  • Control of magnetism in bilayer CrI3 by an external electric field, E. Morell et al., 2D Materials 6(2), 025020 (2019); DOI:10.1088/2053-1583/ab04fb.
  • Pressure-controlled interlayer magnetism in atomically thin CrI3, T. Li et al., Nat. Mater. 18, 1303–1308 (2019); DOI: 10.1038/s41563-019-0506-1.
  • Strain-induced phase transition in CrI3 bilayers, A. Leon et al., 2D Mater. 7, 035008 (2020); DOI: 10.1088/2053-1583/ab8268.
  • Coexistence of Magnetic Orders in Two-Dimensional Magnet CrI3, B. Niu et al., Nano Lett., 20, 1, 553–558 (2020); DOI: 10.1021/acs.nanolett.9b04282.
  • Direct observation of 2D magnons in atomically thin CrI3, J. Cenker et al., Nat. Phys. 17, 20–25 (2021), DOI: 10.1038/s41567-020-0999-1.
  • Systematic Study of Monolayer to Trilayer CrI3: Stacking Sequence Dependence of Electronic Structure and Magnetism, D. Wang et al., J. Phys. Chem. C, 125, 18467−18473 (2021); DOI: 10.1021/acs.jpcc.1c04311.
  • Strain-tunable magnetic and electronic properties of monolayer CrI3, Z. Wu et al., Phys. Chem. Chem. Phys., 21, 7750 (2019); DOI: 10.1039/c8cp07067a.
  • Half-metallicity and enhanced ferromagnetism in Li-adsorbed ultrathin chromium triiodide, Y. Guo et al., J. Mater. Chem. C, 6, 5716 (2018); DOI: 10.1039/c8tc01302k.

Technical Data

CAS Number ‎‎13569-75-0 
Chemical Formula CrI3
Molecular Weight 432.71 g/mol
Bandgap 0.6 - 0.67 eV
Preparation Synthetic - Chemical Vapour Transport (CVT)
Structure ‎‎‎Trigonal
Electronic Properties 2D ferromagnetic semiconductor 
Melting Point >600 °C
Colour Dark green
Synonyms Chromium Triiodide
Classification / Family Transition metal trichalcogenides (TMTCs), 2D semiconductor materials, Nano-electronics, Nano-photonics, Photovoltaic, Materials science

Product Details

Form Purity
Powder ≥99.995%
Crystal ≥99.999%

MSDS Documents

Chromium triiodide powder MSDSChromium triiodide powder

Chromium triiodide crystal MSDSChromium triiodide crystal

Pricing Table

Product Code Form Size/Weight* Price
M2323C1 Powder 500 mg £500
M2323C1 Powder 1 g £800
M2323A10 Crystal Small (≥10 mm2) £520 ea.
M2323A25 Crystal Medium (≥25 mm2) £850 ea.

*typical representative size, areas/dimensions may vary

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To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

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