Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB)
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2023
Authors
Acković, JovanaNikolić, Nenad

Nedić, Zoran
Micić, Ružica
Senćanski, Jelena

Pagnacco, Maja

Tančić, Pavle

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In this paper, 12-tungstenphosphoric acid (PWA) was synthesized in combination with FeCl3 at room temperature (25 oC). At such manner, Fe3+ ion exchange gave new 12-tungstenphosphoric salt of the transition metal iron (FePW12O40×nH2O; Fe-PWA). Thermal analysis determined the temperature of about 596 oC of the phase transition, i.e., the temperature at which the structure of the Kegin anion is disturbed. Therefore, it was chosen temperature above the breakdown of the Kegin anion of 650 oC, and which is required to obtain phosphate tungsten bronzes (PWB) doped with iron (Fe-PWB). The sample was kept in the oven for 10 minutes. Such obtained new Fe-PWB doped bronze was further investigated by the X-ray powder diffraction (XRPD) and Rietveld methods. The XRPD patterns of Fe-PWA and Fe-PWB were taken in the 3-90o 2θ angle range, and clearly reveal crystallographic and structural differences between these two phases. Determined unit-cell parameters of Fe-PWB obtained by the Rietveld method i...n the monoclinic crystallographic system are as following: a0 = 7.53(2) Å; b0 = 7.51(1) Å; c0 = 7.64(1) Å; β0 = 89.7(2)o; and V0 = 431(2) Å3. These unit-cell parameters were compared with PWB, as well as other previously doped bronzes (Li-PWB and Ca-PWB). It can be concluded that inserting of the Fe3+ ion into the PWB’s structure was undoubtedly proven, and have the most influence to the axis a0 (i.e., it significantly increased), angle β0 (i.e., it significantly decreased), and volume V0 (i.e., it significantly increased). On the other hand, influence to the axis c0 is quite smaller (i.e., it slightly decreased), whereas influence to the axis b0 is minor. Such behavior is also very different in comparison to the Li-PWB and Ca-PWB.
Keywords:
12-tungstenphosphoric acid / XRPD / Thermal analysisSource:
Programme and book of abstracts - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16. 2023, Belgrade, Serbia, 2023, 62-62Publisher:
- Institut za multidisciplinarna istraživanja
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IHTMTY - CONF AU - Acković, Jovana AU - Nikolić, Nenad AU - Nedić, Zoran AU - Micić, Ružica AU - Senćanski, Jelena AU - Pagnacco, Maja AU - Tančić, Pavle PY - 2023 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/6428 AB - In this paper, 12-tungstenphosphoric acid (PWA) was synthesized in combination with FeCl3 at room temperature (25 oC). At such manner, Fe3+ ion exchange gave new 12-tungstenphosphoric salt of the transition metal iron (FePW12O40×nH2O; Fe-PWA). Thermal analysis determined the temperature of about 596 oC of the phase transition, i.e., the temperature at which the structure of the Kegin anion is disturbed. Therefore, it was chosen temperature above the breakdown of the Kegin anion of 650 oC, and which is required to obtain phosphate tungsten bronzes (PWB) doped with iron (Fe-PWB). The sample was kept in the oven for 10 minutes. Such obtained new Fe-PWB doped bronze was further investigated by the X-ray powder diffraction (XRPD) and Rietveld methods. The XRPD patterns of Fe-PWA and Fe-PWB were taken in the 3-90o 2θ angle range, and clearly reveal crystallographic and structural differences between these two phases. Determined unit-cell parameters of Fe-PWB obtained by the Rietveld method in the monoclinic crystallographic system are as following: a0 = 7.53(2) Å; b0 = 7.51(1) Å; c0 = 7.64(1) Å; β0 = 89.7(2)o; and V0 = 431(2) Å3. These unit-cell parameters were compared with PWB, as well as other previously doped bronzes (Li-PWB and Ca-PWB). It can be concluded that inserting of the Fe3+ ion into the PWB’s structure was undoubtedly proven, and have the most influence to the axis a0 (i.e., it significantly increased), angle β0 (i.e., it significantly decreased), and volume V0 (i.e., it significantly increased). On the other hand, influence to the axis c0 is quite smaller (i.e., it slightly decreased), whereas influence to the axis b0 is minor. Such behavior is also very different in comparison to the Li-PWB and Ca-PWB. PB - Institut za multidisciplinarna istraživanja C3 - Programme and book of abstracts - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16. 2023, Belgrade, Serbia T1 - Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB) SP - 62 EP - 62 UR - https://hdl.handle.net/21.15107/rcub_cer_6428 ER -
@conference{ author = "Acković, Jovana and Nikolić, Nenad and Nedić, Zoran and Micić, Ružica and Senćanski, Jelena and Pagnacco, Maja and Tančić, Pavle", year = "2023", abstract = "In this paper, 12-tungstenphosphoric acid (PWA) was synthesized in combination with FeCl3 at room temperature (25 oC). At such manner, Fe3+ ion exchange gave new 12-tungstenphosphoric salt of the transition metal iron (FePW12O40×nH2O; Fe-PWA). Thermal analysis determined the temperature of about 596 oC of the phase transition, i.e., the temperature at which the structure of the Kegin anion is disturbed. Therefore, it was chosen temperature above the breakdown of the Kegin anion of 650 oC, and which is required to obtain phosphate tungsten bronzes (PWB) doped with iron (Fe-PWB). The sample was kept in the oven for 10 minutes. Such obtained new Fe-PWB doped bronze was further investigated by the X-ray powder diffraction (XRPD) and Rietveld methods. The XRPD patterns of Fe-PWA and Fe-PWB were taken in the 3-90o 2θ angle range, and clearly reveal crystallographic and structural differences between these two phases. Determined unit-cell parameters of Fe-PWB obtained by the Rietveld method in the monoclinic crystallographic system are as following: a0 = 7.53(2) Å; b0 = 7.51(1) Å; c0 = 7.64(1) Å; β0 = 89.7(2)o; and V0 = 431(2) Å3. These unit-cell parameters were compared with PWB, as well as other previously doped bronzes (Li-PWB and Ca-PWB). It can be concluded that inserting of the Fe3+ ion into the PWB’s structure was undoubtedly proven, and have the most influence to the axis a0 (i.e., it significantly increased), angle β0 (i.e., it significantly decreased), and volume V0 (i.e., it significantly increased). On the other hand, influence to the axis c0 is quite smaller (i.e., it slightly decreased), whereas influence to the axis b0 is minor. Such behavior is also very different in comparison to the Li-PWB and Ca-PWB.", publisher = "Institut za multidisciplinarna istraživanja", journal = "Programme and book of abstracts - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16. 2023, Belgrade, Serbia", title = "Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB)", pages = "62-62", url = "https://hdl.handle.net/21.15107/rcub_cer_6428" }
Acković, J., Nikolić, N., Nedić, Z., Micić, R., Senćanski, J., Pagnacco, M.,& Tančić, P.. (2023). Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB). in Programme and book of abstracts - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16. 2023, Belgrade, Serbia Institut za multidisciplinarna istraživanja., 62-62. https://hdl.handle.net/21.15107/rcub_cer_6428
Acković J, Nikolić N, Nedić Z, Micić R, Senćanski J, Pagnacco M, Tančić P. Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB). in Programme and book of abstracts - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16. 2023, Belgrade, Serbia. 2023;:62-62. https://hdl.handle.net/21.15107/rcub_cer_6428 .
Acković, Jovana, Nikolić, Nenad, Nedić, Zoran, Micić, Ružica, Senćanski, Jelena, Pagnacco, Maja, Tančić, Pavle, "Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB)" in Programme and book of abstracts - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16. 2023, Belgrade, Serbia (2023):62-62, https://hdl.handle.net/21.15107/rcub_cer_6428 .