| | 1 | Author
| R. Zaleski, Z. Jakubas, L. Galewski, Sobczyk | Requires cookie* | | | Title
|  | | | | Abstract
| Dielectric. DSC and preliminary X-ray diffraction studies on [(C2H5)4N]3Sb2Br9 (TEABA) and [(C2H5)4N]3Bi2Br9 (TEABB) are reported. The compounds are isomorphous, space group P6322. The static electric permittivity measurements on single crystals in the temperature range 220 290 K revealed that both compounds show two distinct dielectric anomalies; TEABA at Tcl = 258 K and Tc2 = 252 K, while TEABB at Tcl= 265 K and Tcl = 248 K. The DSC studies show only one anomaly of first order at TcX =258 K for TEABA, and TcX =266 K for TEABB. These transitions are pre sumably related to a freezing of the reorientational motion of the tetraethylammonium cations. S tr u c tu r a l P h a s e T ra n s itio n s in |(C 2H 5)4N ] 3S b 2B r 9 a n d |(C 2H 5) 4N |3B i2B r 9 | | | |
Reference
| Z. Naturforsch. 44a, 1102 (1989); received May 11 1989 | | | |
Published
| 1989 | | | |
Keywords
| Alkylammonium halogenoantimonates, Bismuthates, Phase transition Dielectric, DSC, Single crystals | | | |
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| default:Reihe_A/44/ZNA-1989-44a-1102.pdf | | | | Identifier
| ZNA-1989-44a-1102 | | | | Volume
| 44 | |
| 2 | Author
| P. De, La Presa, K. P. Lieb, M. Uhrmacher, L. Ziegeler | Requires cookie* | | | Title
| Perturbed Angular Correlation Studies in SrTi0 3 Single Crystals | | | | Abstract
| The quadrupole hyperfine interactions of 11 'Cd/ 111 In probe nuclei in single-crystalline SrTi0 3 perovskite samples were investigated using Perturbed Angular Correlation spectroscopy. Three electric field gradients were detected and their fractions and hyperfine parameters were measured in the temperature range from 26 to 700 K. The fraction / 0 having a vanishing quadrupole frequency, as expected for 111 Cd on substitutional sites in a cubic lattice, starts to develop around 300 K and reaches 100% at 700 K. Two well-defined EFG's having closely lying quadrupole frequencies and asymmetry parameters of cj qi = 49.1(3) Mrad/s, 77, = 0.10(2) and u Q2 = 51.8(3) Mrad/s, r] 2 = 0.12(2), at room temperature, were identified in the temperature range from 250 to 530 K, and their (100) orientation in the lattice was determined. They are associated with electronic defects at the probe atoms. | | | |
Reference
| Z. Naturforsch. 55a, 237—241 (2000); received August 24 1999 | | | |
Published
| 2000 | | | |
Keywords
| Perturbed Angular Correlations, SrTi0 3, Single Crystal, Electronic Defects, Perovskite | | | |
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| default:Reihe_A/55/ZNA-2000-55a-0237.pdf | | | | Identifier
| ZNA-2000-55a-0237 | | | | Volume
| 55 | |
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