Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure Prediction
Crystals of new silicate-germanate Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O have been synthesized hydrothermally in a multi-component system TbCl<sub>3</sub&g...
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MDPI AG
2021-04-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/4/395 |
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| author | Anastasiia Topnikova Elena Belokoneva Olga Dimitrova Anatoly Volkov Dina Deyneko |
| author_facet | Anastasiia Topnikova Elena Belokoneva Olga Dimitrova Anatoly Volkov Dina Deyneko |
| author_sort | Anastasiia Topnikova |
| collection | DOAJ |
| description | Crystals of new silicate-germanate Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O have been synthesized hydrothermally in a multi-component system TbCl<sub>3</sub>:GeO<sub>2</sub>:SiO<sub>2</sub> = 1:1:5 at T = 280 °C and P = 100 atm. K<sub>2</sub>CO<sub>3</sub>, Rb<sub>2</sub>CO<sub>3</sub> and Cs<sub>2</sub>CO<sub>3</sub> were added to the solution as mineralizers. The crystal structure was solved using single crystal X-ray data: <i>a</i> = 15.9429(3), <i>b</i> = 14.8407(3), <i>c</i> = 7.2781(1) Å, sp. gr. <i>Pbam.</i> New Rb,Cs,Tb-silicate-germanate consists of a [Si<sub>5</sub>.<sub>43</sub>Ge<sub>0</sub>.<sub>57</sub>O<sub>15</sub>]<sub>∞∞</sub> corrugated tetrahedral layer combined by isolated TbO<sub>6</sub> octahedra into the mixed microporous framework as in synthetic K<sub>3</sub>Nd[Si<sub>6</sub>O<sub>15</sub>]·2H<sub>2</sub>O, K<sub>3</sub>Nd[Si<sub>6</sub>O<sub>15</sub>] and K<sub>3</sub>Eu[Si<sub>6</sub>O<sub>15</sub>]·2H<sub>2</sub>O with the cavities occupied by Cs, Rb atoms and water molecules. Luminescence spectrum on new crystals was obtained and analysed. A comparison with the other representatives of related layered natural and synthetic silicates was carried out based on the topology-symmetry analysis by the OD (order-disorder) approach. The wollastonite chain was selected as the initial structural unit. Three symmetrical ways of forming ribbon from such a chain and three ways of further connecting ribbons to each other into the layer were revealed and described with symmetry groupoids. Hypothetical structural variants of the layers and ribbons in this family were predicted. |
| first_indexed | 2024-03-10T12:26:57Z |
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| language | English |
| last_indexed | 2024-03-10T12:26:57Z |
| publishDate | 2021-04-01 |
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| spelling | doaj.art-54988144155441ac8cf3febf8977f2322023-11-21T14:56:30ZengMDPI AGMinerals2075-163X2021-04-0111439510.3390/min11040395Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure PredictionAnastasiia Topnikova0Elena Belokoneva1Olga Dimitrova2Anatoly Volkov3Dina Deyneko4Geological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, RussiaGeological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, RussiaGeological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, RussiaGeological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, RussiaChemical Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, RussiaCrystals of new silicate-germanate Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O have been synthesized hydrothermally in a multi-component system TbCl<sub>3</sub>:GeO<sub>2</sub>:SiO<sub>2</sub> = 1:1:5 at T = 280 °C and P = 100 atm. K<sub>2</sub>CO<sub>3</sub>, Rb<sub>2</sub>CO<sub>3</sub> and Cs<sub>2</sub>CO<sub>3</sub> were added to the solution as mineralizers. The crystal structure was solved using single crystal X-ray data: <i>a</i> = 15.9429(3), <i>b</i> = 14.8407(3), <i>c</i> = 7.2781(1) Å, sp. gr. <i>Pbam.</i> New Rb,Cs,Tb-silicate-germanate consists of a [Si<sub>5</sub>.<sub>43</sub>Ge<sub>0</sub>.<sub>57</sub>O<sub>15</sub>]<sub>∞∞</sub> corrugated tetrahedral layer combined by isolated TbO<sub>6</sub> octahedra into the mixed microporous framework as in synthetic K<sub>3</sub>Nd[Si<sub>6</sub>O<sub>15</sub>]·2H<sub>2</sub>O, K<sub>3</sub>Nd[Si<sub>6</sub>O<sub>15</sub>] and K<sub>3</sub>Eu[Si<sub>6</sub>O<sub>15</sub>]·2H<sub>2</sub>O with the cavities occupied by Cs, Rb atoms and water molecules. Luminescence spectrum on new crystals was obtained and analysed. A comparison with the other representatives of related layered natural and synthetic silicates was carried out based on the topology-symmetry analysis by the OD (order-disorder) approach. The wollastonite chain was selected as the initial structural unit. Three symmetrical ways of forming ribbon from such a chain and three ways of further connecting ribbons to each other into the layer were revealed and described with symmetry groupoids. Hypothetical structural variants of the layers and ribbons in this family were predicted.https://www.mdpi.com/2075-163X/11/4/395RE-silicate-germanatehydrothermal synthesislayered silicatesmodular approachwollastonite chaintopology-symmetry analysis |
| spellingShingle | Anastasiia Topnikova Elena Belokoneva Olga Dimitrova Anatoly Volkov Dina Deyneko Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure Prediction Minerals RE-silicate-germanate hydrothermal synthesis layered silicates modular approach wollastonite chain topology-symmetry analysis |
| title | Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure Prediction |
| title_full | Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure Prediction |
| title_fullStr | Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure Prediction |
| title_full_unstemmed | Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure Prediction |
| title_short | Rb<sub>1.66</sub>Cs<sub>1.34</sub>Tb[Si<sub>5.43</sub>Ge<sub>0.57</sub>O<sub>15</sub>]·H<sub>2</sub>O, a New Member of the OD-Family of Natural and Synthetic Layered Silicates: Topology-Symmetry Analysis and Structure Prediction |
| title_sort | rb sub 1 66 sub cs sub 1 34 sub tb si sub 5 43 sub ge sub 0 57 sub o sub 15 sub ·h sub 2 sub o a new member of the od family of natural and synthetic layered silicates topology symmetry analysis and structure prediction |
| topic | RE-silicate-germanate hydrothermal synthesis layered silicates modular approach wollastonite chain topology-symmetry analysis |
| url | https://www.mdpi.com/2075-163X/11/4/395 |
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