caa a22 4500 378857606 CHVBK 20180305123338.0 cr unu---uuuuu 161128e20030301xx s 000 0 eng 10.1524/zkri.218.3.171.20754 doi (NATIONALLICENCE)gruyter-10.1524/zkri.218.3.171.20754 Chemical, thermal, and theoretical analysis of the α—β phase transition of Ba3Tt4 compounds [Elektronische Daten] [F. Zürcher, S. Leoni, R. Nesper] The α to β phase transition of Ba3Tt4 (Tt = Si, Ge; Ba3Ge4 and Ba3Si4 structure type, respectively) has been investigated experimentally by differential thermal analysis (transition temperature 628 K) and variation of the composition Ba3SixGe4-x which shows that the transition is clearly dependent on the compositional parameter (0.4 ≤ x ≤ 0.5). The five new Zintl compounds Ba3Si1.89Ge2.11, Ba3Si1.05Ge2.95, Ba3Si0.57Ge3.43 (Ba3Si4 structure type) and Ba3Si0.31Ge3.69, Ba3Si0.16Ge3.84 (Ba3Ge4 structure type) were synthesized and structurally characterized. We have also developed a topological model for the description of the phase transition which is based on the Periodic Nodal Surface (PNS) approach. © 2003 Oldenbourg Wissenschaftsverlag GmbH Crystallography nationallicence Inorganic chemistry nationallicence Organic chemistry nationallicence Zürcher F. aut Leoni S. aut Nesper R. aut Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 218/3(2003-03-01), 171-177 2194-4946 218:3<171 2003 218 zkri https://doi.org/10.1524/zkri.218.3.171.20754 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zkri.218.3.171.20754 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zürcher F. aut NATIONALLICENCE 700 1- Leoni S. aut NATIONALLICENCE 700 1- Nesper R. aut NATIONALLICENCE 773 0- Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 218/3(2003-03-01), 171-177 2194-4946 218:3<171 2003 218 zkri CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter