Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles
BaMoO<sub>4</sub> was obtained via facile mechanochemical synthesis at room temperature and a solid-state reaction. An evaluation of the phase composition and structural and optical properties of BaMoO<sub>4</sub> was conducted. The influence of different milling speeds on th...
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2023-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/21/7025 |
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| author | Maria Gancheva Reni Iordanova Iovka Koseva Georgi Avdeev Gergana Burdina Petar Ivanov |
| author_facet | Maria Gancheva Reni Iordanova Iovka Koseva Georgi Avdeev Gergana Burdina Petar Ivanov |
| author_sort | Maria Gancheva |
| collection | DOAJ |
| description | BaMoO<sub>4</sub> was obtained via facile mechanochemical synthesis at room temperature and a solid-state reaction. An evaluation of the phase composition and structural and optical properties of BaMoO<sub>4</sub> was conducted. The influence of different milling speeds on the preparation of BaMoO<sub>4</sub> was explored. A shorter reaction time for the phase formation of BaMoO<sub>4</sub> was achieved using a milling speed of 850 rpm. A milling speed of 500 rpm led to partial amorphization of the initial reagents and to prolongation of the synthesis time of up to 3 h of milling time. Solid-state synthesis was performed via heat treatment at 900 °C for 15 h. X-ray diffraction analysis (XRD), infrared (IR) and UV diffuse reflectance (UV-Vis) and photoluminescence (PL) spectroscopy were carried out to characterize the samples. Independently of the method of preparation, the obtained samples had tetragonal symmetry. The average crystallite sizes of all samples, calculated using Scherrer’s formula, were in the range of 240 to 1540 Å. IR spectroscopy showed that more distorted structural MoO<sub>4</sub> units were formed when the compound was synthesized via a solid-state reaction. The optical band gap energy of the obtained materials was found to decrease from 4.50 to 4.30 eV with increasing crystallite sizes. Green- and blue-light emissions were observed for BaMoO<sub>4</sub> phases under excitation wavelengths of 330 and 488 nm. It was established that the intensity of the PL peaks depends on two factors: the symmetry of MoO<sub>4</sub> units and the crystallite sizes. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T11:25:10Z |
| publishDate | 2023-11-01 |
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| series | Materials |
| spelling | doaj.art-38ebeba613f94a8f8a2a99d795f750e02023-11-10T15:07:40ZengMDPI AGMaterials1996-19442023-11-011621702510.3390/ma16217025Synthesis and Luminescent Properties of Barium Molybdate NanoparticlesMaria Gancheva0Reni Iordanova1Iovka Koseva2Georgi Avdeev3Gergana Burdina4Petar Ivanov5Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., bl. 11, 1113 Sofia, BulgariaInstitute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., bl. 11, 1113 Sofia, BulgariaInstitute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., bl. 11, 1113 Sofia, BulgariaInstitute of Physical Chemistry “Acad. Rostislaw Kaischew”, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., bl. 11, 1113 Sofia, BulgariaInstitute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., bl. 11, 1113 Sofia, BulgariaInstitute of Optical Materials and Technologies “Acad. Jordan Malinowski”, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., bl. 109, 1113 Sofia, BulgariaBaMoO<sub>4</sub> was obtained via facile mechanochemical synthesis at room temperature and a solid-state reaction. An evaluation of the phase composition and structural and optical properties of BaMoO<sub>4</sub> was conducted. The influence of different milling speeds on the preparation of BaMoO<sub>4</sub> was explored. A shorter reaction time for the phase formation of BaMoO<sub>4</sub> was achieved using a milling speed of 850 rpm. A milling speed of 500 rpm led to partial amorphization of the initial reagents and to prolongation of the synthesis time of up to 3 h of milling time. Solid-state synthesis was performed via heat treatment at 900 °C for 15 h. X-ray diffraction analysis (XRD), infrared (IR) and UV diffuse reflectance (UV-Vis) and photoluminescence (PL) spectroscopy were carried out to characterize the samples. Independently of the method of preparation, the obtained samples had tetragonal symmetry. The average crystallite sizes of all samples, calculated using Scherrer’s formula, were in the range of 240 to 1540 Å. IR spectroscopy showed that more distorted structural MoO<sub>4</sub> units were formed when the compound was synthesized via a solid-state reaction. The optical band gap energy of the obtained materials was found to decrease from 4.50 to 4.30 eV with increasing crystallite sizes. Green- and blue-light emissions were observed for BaMoO<sub>4</sub> phases under excitation wavelengths of 330 and 488 nm. It was established that the intensity of the PL peaks depends on two factors: the symmetry of MoO<sub>4</sub> units and the crystallite sizes.https://www.mdpi.com/1996-1944/16/21/7025BaMoO<sub>4</sub>high-energy ball millingsolid-state reactionnanoparticlesinfrared absorption bandsoptical band gaps |
| spellingShingle | Maria Gancheva Reni Iordanova Iovka Koseva Georgi Avdeev Gergana Burdina Petar Ivanov Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles Materials BaMoO<sub>4</sub> high-energy ball milling solid-state reaction nanoparticles infrared absorption bands optical band gaps |
| title | Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles |
| title_full | Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles |
| title_fullStr | Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles |
| title_full_unstemmed | Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles |
| title_short | Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles |
| title_sort | synthesis and luminescent properties of barium molybdate nanoparticles |
| topic | BaMoO<sub>4</sub> high-energy ball milling solid-state reaction nanoparticles infrared absorption bands optical band gaps |
| url | https://www.mdpi.com/1996-1944/16/21/7025 |
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