0000000000897366
AUTHOR
N. Jansen
Application of 61Ni Mössbauer spectroscopy to chemical problems
Using the possibility to produce 61Co sources at the MAinz MIcrotron, 61Ni Mossbauer spectroscopy was applied to different kinds of chemical problems. Measurements of isomer shifts and V zz values in some common compounds and compounds with unusual chemical bonding for comparison with band structure calculations, measurement of 61Ni Mossbauer parameters in model compounds for hydrogenase and dehydrogenase with an active [NiS4] centre, and study of novel binary NiF3 compounds at helium temperature are presented.
Magnetization and61Ni Mössbauer effect study of the ternary arsenide CrNiAs
The results of x-ray diffraction, dc magnetization, and 61Ni M?ssbauer spectroscopy studies of the ternary arsenide CrNiAs are reported. This compound crystallizes in the orthorhombic Fe2P-type structure (space group ) with the lattice parameters a = 6.1128(2)?? and c = 3.6585(1)??. CrNiAs is a mean-field ferromagnet with Curie temperature TC = 171.9(1)?K and the critical exponents ? = 0.514(18), ? = 1.010(16), and ? = 2.922(10). The temperature dependence of the magnetic susceptibility above TC follows the modified Curie?Weiss law with a paramagnetic Curie temperature of 176.0(3)?K and effective magnetic moment per transition metal atom of 2.42(1)??B. The magnetic moment per formula unit a…
Laser — Klinische Anwendung
Der Neodym-YAG-Laser mit einer Emissionswellenlange von 1,06 μm besitzt eine hohe Penetrationstiefe ins Gewebe von ca. 5 mm mit einem homogenen Koagulationssaum. Bereits 1973 wurden von Mussiggang u. Mitarb. [3] Hautschnitte und Resektionen an Nieren, Leber und Milz im Tierversuch durchgefuhrt, die jedoch offensichtlich wegen der damals zur Verfugung stehenden Laserleistung von nur ca. 50 Watt nicht uberzeugend verliefen. Nach dem nunmehr der Neodym-YAG-Laser in der Urologie (insbesondere in der Behandlung des Blasentumorleidens und bei pathologischen Veranderungen am auseren Genitale) und anderen Fachdisziplinen nach Verbesserung des Instrumentariums und einer hoheren Leistung bei zahlreic…
Magnetic properties and61Ni Mössbauer spectroscopy of the ternary phosphide CrNiP
The results of x-ray diffraction, dc magnetization, and 61Ni Mossbauer spectroscopy studies of the ternary phosphide CrNiP are reported. This compound crystallizes in the orthorhombic Co2P-type structure (space group Pnma) with the lattice parameters a = 5.7965(1) A, b = 3.5337(1) A, and c = 6.8123(2) A. NiCrP is a ferromagnet with Curie temperature TC = 135.1(1) K. The ferromagnetic-to-paramagnetic transition is characterized by the critical exponents β = 0.355(22), γ = 1.241(18), and δ = 4.585(20). Their values are close to those of a 3D Heisenberg ferromagnet. The temperature dependence of the magnetic susceptibility above TC follows the modified Curie–Weiss law with a paramagnetic Curie…