TY  - CONF
AU  - Acković, Jovana
AU  - Nikolić, Nenad
AU  - Nedić, Zoran
AU  - Micić, Ružica
AU  - Senćanski, Jelena V.
AU  - Pagnacco, Maja
AU  - Tančić, Pavle
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2531
AB  - In this paper, 12-tungstenphosphoric acid (PWA) was synthesized in
combination with FeCl3 at room temperature (25 °C). 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 °C 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 °C, and which is required to obtain phosphate
tungsten bronzes (PWB) doped with iron (Fe-PWB). The sample was kept in the
oven for 10 min. 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 3–90° 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)° and V0 = 431(2) Å3. These unit-cell parameters were
compared with PWB, as well as other previously characterized doped bronzes (LiPWB 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, Kneza Višeslava 1, 11000 Belgrade, Serbia
C3  - 7th Conference of The Serbian Society for Ceramic Materials
T1  - Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB)
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2531
ER  - 

@conference{
author = "Acković, Jovana and Nikolić, Nenad and Nedić, Zoran and Micić, Ružica and Senćanski, Jelena V. 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 °C). 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 °C 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 °C, and which is required to obtain phosphate
tungsten bronzes (PWB) doped with iron (Fe-PWB). The sample was kept in the
oven for 10 min. 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 3–90° 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)° and V0 = 431(2) Å3. These unit-cell parameters were
compared with PWB, as well as other previously characterized doped bronzes (LiPWB 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, Kneza Višeslava 1, 11000 Belgrade, Serbia",
journal = "7th Conference of The Serbian Society for Ceramic Materials",
title = "Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB)",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2531"
}

Acković, J., Nikolić, N., Nedić, Z., Micić, R., Senćanski, J. V., Pagnacco, M.,& Tančić, P.. (2023). Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB). in 7th Conference of The Serbian Society for Ceramic Materials
Institut za multidisciplinarna istraživanja, Kneza Višeslava 1, 11000 Belgrade, Serbia..
https://hdl.handle.net/21.15107/rcub_rimsi_2531

Acković J, Nikolić N, Nedić Z, Micić R, Senćanski JV, Pagnacco M, Tančić P. Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB). in 7th Conference of The Serbian Society for Ceramic Materials. 2023;.
https://hdl.handle.net/21.15107/rcub_rimsi_2531 .

Acković, Jovana, Nikolić, Nenad, Nedić, Zoran, Micić, Ružica, Senćanski, Jelena V., Pagnacco, Maja, Tančić, Pavle, "Crystallographic investigation of the iron phosphate tungsten bronze (Fe-PWB)" in 7th Conference of The Serbian Society for Ceramic Materials (2023),
https://hdl.handle.net/21.15107/rcub_rimsi_2531 .

TY  - CONF
AU  - Pagnacco, Maja
AU  - Tančić, Pavle
AU  - Nikolić, Nenad
AU  - Maksimović, Jelena
AU  - Senćanski, Jelena V.
AU  - Nedić, Zoran
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2528
AB  - Recently, two different effects of phosphate tungsten (PWB) and phosphate
molybdenum (PMoB) bronzes (obtained by thermal treatment), on oscillatory
Briggs-Rauscher (BR) dynamic have been found [1]. Although both are insoluble in
BR solution [2], the addition of different masses of PWB linearly decreases the BR
oscillation time, while the addition of different masses of PMoB had no effects on
the BR reaction. Furthermore, PWB has an identical role as metal catalyst Mn2+ in
BR reaction and for obtained behavior is probably responsible the different
mechanisms of heterogeneous catalysis of these bronzes in oscillatory reaction.
Therefore, a deeper investigation was done in order to find the major structural
characteristic of these two bronzes by using the XRPD method.
What is so different for these two bronzes, causing dissimilar effects in BR
reaction, is it “just” catalytic activity of central cation or there is something more?
The XRPD method confirmed very different structures of PWB and PMoB as
monoclinic and orthorhombic, respectively [3,4]. This work tries to connect the
structural properties of PWB and PMoB with BR oscillatory reaction responses,
expanding the usage of oscillatory reaction in material science and catalysis, in
general.
PB  - Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia
C3  - 6th Conference of The Serbian Society for Ceramic Materials
T1  - What could be the reason for different behavior of phosphate tungsten and phosphate molybdenium bronzes in Briggs-Rauscher reaction: new insight
SP  - 67
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2528
ER  - 

@conference{
author = "Pagnacco, Maja and Tančić, Pavle and Nikolić, Nenad and Maksimović, Jelena and Senćanski, Jelena V. and Nedić, Zoran",
year = "2022",
abstract = "Recently, two different effects of phosphate tungsten (PWB) and phosphate
molybdenum (PMoB) bronzes (obtained by thermal treatment), on oscillatory
Briggs-Rauscher (BR) dynamic have been found [1]. Although both are insoluble in
BR solution [2], the addition of different masses of PWB linearly decreases the BR
oscillation time, while the addition of different masses of PMoB had no effects on
the BR reaction. Furthermore, PWB has an identical role as metal catalyst Mn2+ in
BR reaction and for obtained behavior is probably responsible the different
mechanisms of heterogeneous catalysis of these bronzes in oscillatory reaction.
Therefore, a deeper investigation was done in order to find the major structural
characteristic of these two bronzes by using the XRPD method.
What is so different for these two bronzes, causing dissimilar effects in BR
reaction, is it “just” catalytic activity of central cation or there is something more?
The XRPD method confirmed very different structures of PWB and PMoB as
monoclinic and orthorhombic, respectively [3,4]. This work tries to connect the
structural properties of PWB and PMoB with BR oscillatory reaction responses,
expanding the usage of oscillatory reaction in material science and catalysis, in
general.",
publisher = "Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia",
journal = "6th Conference of The Serbian Society for Ceramic Materials",
title = "What could be the reason for different behavior of phosphate tungsten and phosphate molybdenium bronzes in Briggs-Rauscher reaction: new insight",
pages = "67",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2528"
}

Pagnacco, M., Tančić, P., Nikolić, N., Maksimović, J., Senćanski, J. V.,& Nedić, Z.. (2022). What could be the reason for different behavior of phosphate tungsten and phosphate molybdenium bronzes in Briggs-Rauscher reaction: new insight. in 6th Conference of The Serbian Society for Ceramic Materials
Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia., 67.
https://hdl.handle.net/21.15107/rcub_rimsi_2528

Pagnacco M, Tančić P, Nikolić N, Maksimović J, Senćanski JV, Nedić Z. What could be the reason for different behavior of phosphate tungsten and phosphate molybdenium bronzes in Briggs-Rauscher reaction: new insight. in 6th Conference of The Serbian Society for Ceramic Materials. 2022;:67.
https://hdl.handle.net/21.15107/rcub_rimsi_2528 .

Pagnacco, Maja, Tančić, Pavle, Nikolić, Nenad, Maksimović, Jelena, Senćanski, Jelena V., Nedić, Zoran, "What could be the reason for different behavior of phosphate tungsten and phosphate molybdenium bronzes in Briggs-Rauscher reaction: new insight" in 6th Conference of The Serbian Society for Ceramic Materials (2022):67,
https://hdl.handle.net/21.15107/rcub_rimsi_2528 .