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Chromium Triiodide (CrI3) Powder and Crystals

Product Code M2323C1-500mg
Price £376.00 ex. VAT

Low price, high purity 2D metal chromiun triiodide powder and crystal

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

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.

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 triiodide in several different forms for a range of applications.

Chromium triiodide powder

Germanium diselenide powder

Can be used for preparation of chromium triiodide nanoplates and ultrathin films

Sold by weight

≥ 99.995% purity

From £168.00

Chromium triiodide crystal by size

Germanium disulfide crystal

Can be used to produce single or few-layer chromium triiodide sheets via mechanical or liquid exfoliation

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

≥ 99.999% purity

From £396.00

*Typical representative size, areas/dimensions may vary

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

Platinum FET test chips optimized for 2D materials

Perform electrical and optical measurements without expensive lithography equipment

  • Platinum FET test chips optimized for 2D materials, just £149.00
  • Prepatterned with platinum electrodes on a Si-SiO2 substrate
  • Source-drain channel lengths ranging from 4 µm to 20 µm
  • Transfer your crystal across the channel and start measuring

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

Key Product Data

  • High purity, low price CrI3
  • Available as a powder or as individual crystals
  • Can be used to produce single or few-layer sheets
  • Free worldwide shipping on qualifying orders

Structure and Properties

After exfoliation of crystals or powder, chromium triiodide typically has the following properties:

  • CrI3 exhibits stronge 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 triiodide single crystals can be used to prepare monolayer and few-layer CrI3 by mechanical or liquid exfoliation. Chromium triiodide 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.

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 (III) iodide
Classification / Family Transition metal trichalcogenides (TMTCs), 2D semiconductor materials, Nano-electronics, Nano-photonics, Photovoltaic, Materials science

Product Details

Form Purity
Chromium Triiodide Powder ≥ 99.995%
Chromium Triiodide Crystal ≥ 99.999%

MSDS Documents

Chromium triiodide powder MSDSChromium triiodide powder

Chromium triiodide crystal MSDSChromium triiodide crystal

Structure of Chromium Triiodide

Single crystals of chromium triiodide 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).

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.

CrI3 crystal structure

Top and side view of single-layer chromium triiodide.

Chromium Triiodide Applications

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 triiodide 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

Video by Ossila

Pricing Table (All)

Form Size/Weight* Product Code Price
Powder 500 mg M2323C1 £376.00
Powder 1 g M2323C1 £599.00
Crystal Small (≥ 10 mm2) M2323A10 £396.00 ea.
Crystal Medium (≥ 25 mm2) M2323A25 £638.00 ea.

*typical representative size, areas/dimensions may vary

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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.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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