The production of targets for the generation of Radioactive Ion Beams (RIB) characterized by high power resistance, fast diffusion release, high permeability and high ionization yield is a topic of great interest and the research on this field is currently very lively. In this work, the synthetic route where carburization of a suitable precursor compound of lanthanum is obtained by mixing the compound with a proper amount of graphite and a binder, followed by thermal treatment has been chosen. In order to increase the porosity of the final material a novel technique, which makes use of lanthanum oxalate as starting precursor, has been tested. A series of pellets with diameter of 13 mm and thickness of 1 mm were obtained by mixing lanthanum oxide and graphite in a mortar and the cohesion of the powders was assured by the addition of a phenolic binder. Thermal treatments on the pellets were performed in Lindberg furnace, equipped with an alumina tube, and in Astro furnace, equipped, with a graphite chamber. In a first run, a thermal treatment has been performed on a pellet based on lanthanum oxide and graphite previously decarbonated and dehydrated in a muffle furnace at 800 ◦ C. The sample was thereafter heated in vacuum up to 1500 ◦C and in argon atmosphere until 1800◦C. The success of the carburization process was confirmed by the appearance of the pellet after the treatments
Thermal treatments and characterizations of pellets for SPES direct target
TONEZZER, Michele;
2007
Abstract
The production of targets for the generation of Radioactive Ion Beams (RIB) characterized by high power resistance, fast diffusion release, high permeability and high ionization yield is a topic of great interest and the research on this field is currently very lively. In this work, the synthetic route where carburization of a suitable precursor compound of lanthanum is obtained by mixing the compound with a proper amount of graphite and a binder, followed by thermal treatment has been chosen. In order to increase the porosity of the final material a novel technique, which makes use of lanthanum oxalate as starting precursor, has been tested. A series of pellets with diameter of 13 mm and thickness of 1 mm were obtained by mixing lanthanum oxide and graphite in a mortar and the cohesion of the powders was assured by the addition of a phenolic binder. Thermal treatments on the pellets were performed in Lindberg furnace, equipped with an alumina tube, and in Astro furnace, equipped, with a graphite chamber. In a first run, a thermal treatment has been performed on a pellet based on lanthanum oxide and graphite previously decarbonated and dehydrated in a muffle furnace at 800 ◦ C. The sample was thereafter heated in vacuum up to 1500 ◦C and in argon atmosphere until 1800◦C. The success of the carburization process was confirmed by the appearance of the pellet after the treatmentsI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
