Chromium(III) telluride

Chromium telluride (Cr₂Te₃) is an inorganic chemical compound. It is composed of the chromium(III) cation and the telluride anion. It has a shadowy gray color, and has a hexagonal crystal structure.

Chromium(III) telluride

Names
IUPAC name Chromium(III) telluride
Other names Dichromium tritelluride
Identifiers
CAS Number	12053-39-3
3D model (JSmol)	Interactive image
ChemSpider	21241695
ECHA InfoCard	100.031.809
EC Number	235-003-8
PubChem CID	6381587
CompTox Dashboard (EPA)	DTXSID30923455
InChI InChI=1S/2Cr.3Te Key: PDJHBRMODJKXLQ-UHFFFAOYSA-N
SMILES [Te]=[Cr][Te][Cr]=[Te]
Properties
Chemical formula	Cr2Te3
Molar mass	486.792
Appearance	Dark gray powder
Density	6.6-7.0 g/cm3
Melting point	1,300 °C (2,370 °F; 1,570 K) approximation
Solubility in water	negligible [1]
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H315, H319, H332, H335
Precautionary statements	P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P312, P304+P340, P305+P351+P338, P312, P321, P322, P330, P332+P313, P337+P313, P362, P363, P403+P233, P405, P501
Related compounds
Other anions	Chromium(III) oxide Chromium(III) sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Properties

Thermodynamic

Chromium telluride samples that are highly saturated with tellurium were found to crystallize in a hexagonal structure, but trigonal lattice distortions are also possible.^[1][2]

Magnetic

Chromium telluride is strongly paramagnetic, and it can be used in the construction of nanocrystals.^[3] In addition, the compound also shows ferromagnetic properties. By creating thin films of chromium telluride, the compound can be tested by reflection high-energy electron diffraction (RHEED), scanning tunneling microscopy (STM), vibrating sample magnetometry, and other physical property measurements. RHEED patterns indicate the flat, smooth growth of chromium telluride film. STM testing shows that the surface atoms of the compound arrange themselves in a hexagonal pattern. The Curie temperature was found to be 180 K^[4] When transitioning between paramagnetic and ferromagnetic forms of magnetism, the surrounding magnetic field collapse into two independent curves with a sole scaling equation.^[5] However, chromium telluride can still continue with a reversal of magnetism.^[6]

When being measured at room temperature, the anomalous Hall voltage of chromium telluride seems to consist of both negative anomalous and positive normal component. The negative anomalous component exhibits saturation against the intensity of the magnetic field, while the positive normal component can be ascribed to hole conduction. This is measured from room temperature to 400 °C with a-c sample current and d-c magnetic field.^[7]

References

1. Goncharuk, L V; Lukashenko, G M (12 April 1973). "Thermodynamic properties of the chromium telluride Cr₂Te₃". Soviet Powder Metallurgy and Metal Ceramics. 13 (9): 726–728. doi:10.1007/BF00797718. S2CID 97609076.
2. Viswanathan, R; Sai Baba, M; Lakshmi Narasimhan, T S; Balasubramanian, R; Darwin Albert Raj, D; Mathews, C K (2 November 1993). "Thermochemistry of metal-rich chromium telluride and its role in fuel-clad chemical interactions". Journal of Alloys and Compounds. 206: 201–210. doi:10.1016/0925-8388(94)90036-1.
3. Ramasamy, Karthik; Mazumdar, Dipanjan; Bennett, Robert D; Gupta, Arunava (2012). "Syntheses and magnetic properties of Cr₂Te₃ and CuCr₂Te₄ nanocrystals". Chemical Communications. 48 (45): 5656–8. doi:10.1039/C2CC32021E. PMID 22549795.
4. Roy, Anupam; Guchhait, Samaresh; Dey, Rik; Pramanik, Tanmoy; Hsieh, Cheng-Chih; Rai, Amritest; Banerjee, Sanjay R (7 April 2015). "Perpendicular Magnetic Anisotropy and Spin Glass-like Behavior in Molecular Beam Epitaxy Grown Chromium Telluride Thin Films". ACS Nano. 9 (4): 3772–3779. arXiv:1509.08140. Bibcode:2015arXiv150908140R. doi:10.1021/nn5065716. PMID 25848950. S2CID 16563479.
5. Liu, Yu; Petrovic, C (12 Mar 2018). "Critical behavior of quasi-two-dimensional weak itinerant ferromagnet trigonal chromium telluride Cr0.62Te". Physical Review B. 96 (13): 134410. arXiv:1803.04482. doi:10.1103/PhysRevB.96.134410. S2CID 119099203.
6. Pramanik, Tanmoy; Roy, Anupam; Dey, Rik; Rai, Amritesh; Guchhait, Samaresh; Mova, Hema CP; Hsieh, Cheng-Chih; Banerjee, Sanjay K (2017). "Angular dependence of magnetization reversal in epitaxial chromium telluride thin films with perpendicular magnetic anisotropy". Journal of Magnetism and Magnetic Materials. 437: 72–77. arXiv:1705.03121. Bibcode:2017JMMM..437...72P. doi:10.1016/j.jmmm.2017.04.039. S2CID 119359926.
7. Nogami, Minoru (1 Jan 1966). "Hall Effect in Chromium Telluride". Japanese Journal of Applied Physics. 5 (2): 134–137. Bibcode:1966JaJAP...5..134N. doi:10.1143/JJAP.5.134. S2CID 94817212.