Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Wolfgang Wisniewski"'
Autor:
Christian Rüssel, Wolfgang Wisniewski
Publikováno v:
CrystEngComm. 23:4419-4433
Crystal engineering is a wide field aimed at producing a large range of crystalline phases in a multitude of forms suited for many specific applications. The method of electrochemically induced nucleation (EiN) enables to produce oxidic crystalline p
Publikováno v:
CrystEngComm. 20:3234-3245
Glasses of the mol composition 2SrO·TiO2·2SiO2 + xSiO2 (with x = 0.0, 0.2, 0.75 and 1.5 mol) were prepared. They were polished and then heat treated for 5 h or more at 830 and 970 °C during which Sr-fresnoite (Sr2TiSi2O8) solely crystallised in al
Autor:
D. Tzankov, Ruzha Harizanova, Ivalina Avramova, Ivailo Gugov, Georgi Avdeev, M. Georgieva, Wolfgang Wisniewski, Christian Rüssel
Publikováno v:
CrystEngComm. 20:4268-4276
Glasses were prepared in the system (100 − x)(0.16Na2O/0.10MnO/0.74SiO2)/xFe2O3 (x = 15 and 25 in mol%) by the traditional melt-quenching technique. Some of them were subsequently crystallized at temperatures in the range from 520 to 700 °C for ti
Publikováno v:
CrystEngComm. 20:5409-5421
Glasses of the mol composition 2BaO·TiO2·2GeO2 + xGeO2 (with x = 0.0, 0.2, 0.75 and 1.5 mol) were prepared, polished and crystallised at 730 and 970 °C for 5 h. All glasses showed the surface crystallisation of Ge-fresnoite (Ba2TiGe2O8) as well as
Oriented surface nucleation and crystal growth in a 18BaO·22CaO·60SiO2mol% glass used for SOFC seals
Autor:
Stefan Reinsch, Christian Thieme, Sonja-M. Groß-Barsnick, Wolfgang Wisniewski, Ralf Müller, Christian Rüssel
Publikováno v:
CrystEngComm. 20:787-795
A glass of the composition 37BaO·16CaO·47SiO2 wt% produced on an industrial scale is crystallized at 970 °C for times ranging from 15 min to 2 h. The crystallization at the immediate surface as well as the crystal growth into the bulk are analyzed
Publikováno v:
CrystEngComm. 19:6208-6214
A glass with the composition 20.1Na2O·23.1BaO·23TiO2·9.8B2O3·21SiO2·3Al2O3 (in mol%) was synthesized using a traditional glass melting technique. Its thermal properties were characterized by differential thermal analysis (DTA), and appropriate t
Publikováno v:
CrystEngComm. 19:2775-2785
Four glasses in the Bi2O3/TiO2/SiO2 and Bi2O3/TiO2/SiO2/Nd2O3 systems are melted and poured into graphite moulds where they show spontaneous crystallization during cooling. The crystal phases α-Bi2Ti4O11, Bi4−xNdxTi3O12, Bi2Si1−yTiyO5, TiO2 and
Autor:
Michael Kracker, Sabrina Seidel, Carlos Eduardo de Meo, Christian Rüssel, Wolfgang Wisniewski
Publikováno v:
CrystEngComm. 18:5492-5501
Glass sheets with the mol% composition 22.5MgO·22.5Al2O3·55SiO2 were coated with a thin ZrO2 layer on both sides via sol–gel dip coating. The samples were heated in a two-step process to 850 °C for 1 h and to 1000 °C for another 3 or 20 h. X-ra
Autor:
Sabrina Berndt, Antje Gawronski, Christian Patzig, Christian Rüssel, Thomas Höche, Wolfgang Wisniewski
Publikováno v:
RSC Advances. 5:15164-15171
Model experiments concerning the nucleation of MgO/Al2O3/SiO2 glass are reported. A glass with the composition 22.5MgO·22.5Al2O3·55SiO2 (in mol%) is brought into contact with ceramic samples of tetragonal ZrO2 at a temperature of 1500 °C. This lea
Publikováno v:
CrystEngComm. 17:2969-2973
A silicate-phosphate-glass was placed into a furnace preheated to 1200 °C in order to crystallize rod-shaped fluoroapatite crystals. The partially crystalline melt is extruded to align the crystal rods, leading to oriented glass-ceramics with anisot