Optical Properties of Ga₂Mn₂O₇ Pyrochlore Ceramic

Kuldeep Singh

doi:10.5281/zenodo.15652339

Authors

Kuldeep Singh Central University of Rajasthan https://orcid.org/0009-0009-4294-488X

DOI:

https://doi.org/10.5281/zenodo.15652339

Keywords:

Energy bandgap, DRS, Pyrochlore, Optical properties

Abstract

We present the first investigation into the optical properties of the Ga₂Mn₂O₇ pyrochlore compound, synthesized via solid-state reaction. The optical band gap, derived from reflectance spectra, was determined to be 3.06 eV, indicating its semiconductor behavior. Further optical characterization revealed key parameters including the extinction coefficient (k), skin depth, and refractive index (n) across a broad wavelength spectrum (200–800 nm). Additionally, the optical conductivity was systematically evaluated and analyzed. These findings underscore the compound’s functional relevance in optoelectronic and protective coating applications.

Author Biography

Kuldeep Singh, Central University of Rajasthan

¹School of Sciences, Noida International University, Greater Noida, Uttar Pradesh-201308, India,

²Department of Physics, Central University of Rajasthan, Bandarsindri, Ajmer-305817, Rajasthan, India

References

Cagnon, J., Boesch, D., Finstrom, N., Nergiz, S., Keane, S., Stemmer, S., Microstructure and dielectric properties of pyrochlore Bi2Ti2O7 thin films, J. Appl. Phys. 102, 44102 (2007).

Wang, Q., Cheng, X., Li, J., Jin, H., Hydrothermal synthesis and photocatalytic properties of pyrochlore Sm2Zr2O7 nanoparticles, J. Photochem. Photobiol. A Chem. 321, 48–54 (2016).

Cao, N., Timusk, T., Raju, N., Greedan, J., Gougeon, P., Optical properties of pyrochlore oxides R2Mo2O7-delta (R: Sm, Gd, and Ho), J. Phys. Condens. Matter. 7, 2489 (1995).

Matteucci, F., Cruciani, G., Dondi, M., Baldi, G., Barzanti, A., Crystal structural and optical properties of Cr-doped Y2Ti2O7 and Y2Sn2O7 pyrochlores, Acta Mater. 55, 2229–2238 (2007).

Öztürk, E., Karacaoglu, E., Kalem, V., Photoluminescence and piezoelectric behaviour of Y2Zr2O7 pyrochlore‐based multifunctional materials and the influence of Eu3+ and Sm3+, Luminescence. 35, 406–411 (2020).

Bongers, P., Van, E., Ferromagnetism in compounds with pyrochlore structure, J. Appl. Phys. 38, 944–945 (1967).

Shimakawa, Y., Kubo, Y., Manako, T., Giant magnetoresistance in Ti2Mn2O7 with the pyrochlore structure, Nature 379, 53–55 (1996).

Tuller, H., Mixed ionic-electronic conduction in a number of fluorite and pyrochlore compounds, Solid State Ionics. 52, 135–146 (1992).

Ćulubrk, S., Antić, Ž., Marinović-Cincović, M., Ahrenkiel, P., Dramićanin, M., Synthesis and luminescent properties of rare earth (Sm3+ and Eu3+) Doped Gd2Ti2O7 pyrochlore nanopowders, Opt. Mater. (Amst). 37, 598–606 (2014).

Blasse, G., Keulen, J., Luminescence properties of Eu2Sn2O7, Chem. Phys. Lett. 124, 534–537 (1986).

Yang, J., Han, Y., Shahid, M., Pan, W., Zhao, M., Wu, W., Wan, C., A promising material for thermal barrier coating: Pyrochlore-related compound Sm2FeTaO7, Scr. Mater. 149, 49–52 (2018).

Jiang, L., Wang, C., Wang, J., Liu, F., Lv, S., You, R., Yao, D., Yan, X., Wang, C., Sun, P., Ultrathin BiVO4 nanosheets sensing electrode for isopropanol sensor based on pyrochlore-Gd2Zr2O7 solid state electrolyte, Sensors Actuators B Chem. 321, 128478 (2020).

Zhang, J., Wang, D., Lai, L., Fang, X., Xu, J., Xu, X., Zhang, X., Liu, J., Peng, H., Wang, X., Probing the reactivity and structure relationship of Ln2Sn2O7 (Ln= La, Pr, Sm and Y) pyrochlore catalysts for CO oxidation, Catal. Today. 327, 168–176 (2019).

Anantharaman, A., Dasari, H., Potential of pyrochlore structure materials in solid oxide fuel cell applications, Ceram. Int. 47, 4367–4388 (2021).

Guo, H., Niu, C., Zhang, L., Wen, X., Liang, C., Zhang, X., Guan, D., Tang, N., Zeng, G., Construction of direct Z-scheme AgI/Bi2Sn2O7 nanojunction system with enhanced photocatalytic activity: accelerated interfacial charge transfer induced efficient Cr (VI) reduction, tetracycline degradation and Escherichia coli inactivation, ACS Sustain. Chem. Eng. 6, 8003–8018 (2018).

Jayaraman, V., Palanivel, B., Ayappan, C., Chellamuthu, M., Mani, A., CdZnS solid solution supported Ce2Sn2O7 pyrochlore photocatalyst that proves to be an efficient candidate towards the removal of organic pollutants, Sep. Purif. Technol. 224, 405–420 (2019).

Xu, B., Debao, L., Liyan, G., Feifei, Z., Lijie, Q., Yiguang, W., Baosheng, X., Shigang, A., Synthesis and characterization of novel porous La2Zr2O7 ceramic with ultralow thermal conductivity and excellent photocatalytic property, PREPRINT (Version 1) available at Research Square [https://doi.org/10.21203/rs.3.rs-820717/v1].

Gavrichev, K., Shlyakhtina, A., Khoroshilov, A., Tyurin, A., Ashmarin, A., Konysheva, E., Thermal expansion and heat capacity of Sm2ScTaO7–A promising material for thermal barrier coatings, J. Am. Ceram. Soc. 102, 4415–4420 (2019).

Martínez-Coronado, R., Alonso, J., Cascos, V., Fernández-Díaz, M., Crystal and magnetic structure of the Bi2RuMnO7 pyrochlore: A potential new cathode for solid oxide fuel cells, J. Power Sources. 247, 876–882 (2014).

Dwivedi, V., Mukhopadhyay, S., Study of optical properties of polycrystalline Y2Ir2O7, AIP Conf. Proc. , 90016 (2017).

Khachnaoui, F., Amor, N., Nouri, K., Bejar, M., Dhahri, E., Investigation of Griffiths-like phase at low temperature in a new magnetocaloric compound, Al2Mn2O7, J. Phys. Chem. Solids. 148, 109605 (2021).

Husain, S., Khan, M., Study of Structural and Electrical Transport Properties of Sn Doped La2Mn2O7, J. Optoelectron. Adv. Mater. 10, 1659–1662 (2008).

Dai, S., Li, Z., Morrish, A., Zhou, X., Zhao, J., Xiong, X., Colossal magnetoresistance in (La0.7Sn0.3)2Mn2O7, Phys. Rev. B. 55, 14125 (1997).

Khachnaoui, F., Amor, N., Bejar, M., Dhahri, E., Hlil, E., Appearance of Griffiths-Like Phase in a New Pyrochlore Compound La2Mn2O7−δ, J. Supercond. Nov. Magn. 32, 2133–2139 (2019).

Khachnaoui, F., Amor, N., Bejar, M., Dhahri, E., Hlil, E., Synthesis and Magnetic Properties of New Pyrochlore Fe2Mn2O7 Compound, J. Supercond. Nov. Magn. 31, 3803–3808 (2018).

Singh, K., Panwar, N., Observation of Griffiths phase, spin glass behaviour and magnetocaloric effect in frustrated Ga2Mn2−xCrxO7 (x= 0, 0.1, 0.3, 0.5) pyrochlore compounds, Curr. Appl. Phys. 53, 86-93 (2023).

Hcini, F., Hcini, S., Almoneef, M., Dhaou, M., Alshammari, M., Mallah, A., Zemni, S., Lefi, N., Bouazizi, M., Thermal, microstructural, optical, magnetic and magnetocaloric studies for Ni0.5Mn0.5Cr2O4 chromite spinel prepared using sol-gel method, J. Mol. Struct. 1243, 130769 (2021).

Souifi, K., Rejaiba, O., Amorri, O., Nasri, M., Alzahrani, B., Bouazizi, M., Khirouni, K., Khelifi, J., Detailed Investigation of Structural, Morphology, Magnetic, Electical and Optical Properties of the Half-Doped Perovskite Nd0.5Ba0.5FeO3, J. Inorg. Organomet. Polym. Mater. 32, 4515–4531 (2022).

Alqahtani, A., Husain, S., Somvanshi, A., Khan, W., Structural, morphological, thermal and optical investigations on Mn doped GdCrO3, J. Alloys Compd. 804, 401–414 (2019).