Làmines primes, el passat al servei del futur

Recentment, investigadors de dos departaments de la UAB i de l'Institut de Ciència de Materials de Barcelona (CSIC), en col·laboració amb altres investigadors, han publicat dos articles en l'àmbit de l'arqueologia que contradiuen la percepció que de vegades es té de les làmines primes com una preparació de laboratori anticuada i mostren com aquest format de mostra ideada al segle XIX continua vigent i pot adaptar-se a la recerca i les noves eines del segle XXI, com ara el sincrotró.Recientemente, investigadores de dos departamentos de la UAB y del Instituto de Ciencia de Materiales de Barcelona (CSIC), en colaboración con otros investigadores, han publicado dos artículos en el ámbito de la arqueología que contradicen la percepción que a veces se tiene de las láminas delgadas como una preparación de laboratorio anticuada y muestran como este formato de muestra ideado en el siglo XIX sigue vigente y puede adaptarse a la investigación y las nuevas herramientas del siglo XXI, como el sincrotrón.Recently, researchers from two different departments of the UAB and the Materials Science Institute of Barcelona (CSIC), in collaboration with researchers from other institutions, have published two articles in the field of archeology that refute the common perception of thin-sections as an old-fashioned laboratory preparation and they have shown how this sample format conceived in the 19th century is still in force and can be adapted to the research and the new tools of the 21st century, such as the synchrotron facilities

Làmines primes, el passat al servei del futur

Recentment, investigadors de dos departaments de la UAB i de l'Institut de Ciència de Materials de Barcelona (CSIC), en col·laboració amb altres investigadors, han publicat dos articles en l'àmbit de l'arqueologia que contradiuen la percepció que de vegades es té de les làmines primes com una preparació de laboratori anticuada i mostren com aquest format de mostra ideada al segle XIX continua vigent i pot adaptar-se a la recerca i les noves eines del segle XXI, com ara el sincrotró.Recientemente, investigadores de dos departamentos de la UAB y del Instituto de Ciencia de Materiales de Barcelona (CSIC), en colaboración con otros investigadores, han publicado dos artículos en el ámbito de la arqueología que contradicen la percepción que a veces se tiene de las láminas delgadas como una preparación de laboratorio anticuada y muestran como este formato de muestra ideado en el siglo XIX sigue vigente y puede adaptarse a la investigación y las nuevas herramientas del siglo XXI, como el sincrotrón.Recently, researchers from two different departments of the UAB and the Materials Science Institute of Barcelona (CSIC), in collaboration with researchers from other institutions, have published two articles in the field of archeology that refute the common perception of thin-sections as an old-fashioned laboratory preparation and they have shown how this sample format conceived in the 19th century is still in force and can be adapted to the research and the new tools of the 21st century, such as the synchrotron facilities

Heteroepitaxial growth of anatase (0 0 1) films on SrTiO3 (0 0 1) by PLD and MBE

The epitaxial growth of anatase (0 0 1) films deposited by pulsed laser deposition (PLD) and molecular beam epitaxy (MBE) on SrTiO (0 0 1) (STO) single crystals has been studied using X-ray diffraction and surface sensitivity UHV techniques. The evolution of the strain represented by the microstrain and the change of the in-plane and out-of-plane lattice parameters with film growth temperature, the effect of the annealing temperature and the influence of the oxygen content of the film have been investigated. The out-of-plane lattice strain shows a compressive (−0.2 %) or expansive (+0.3 %) behavior, in the range 600-900 °C, for temperatures below or above 700 °C, respectively. The in-plane lattice parameters, as well as the cell volume of the film, remain under compression over the entire temperature range explored. PLD films grow into square islands that align with the surface lattice directions of the STO substrate. The maximum size of these islands is reached at growth temperatures close to 875-925 °C. Film annealing at temperatures of 800 °C or higher melts the islands into flat terraces. Larger terraces are reached at high annealing temperatures of 925 °C for extended periods of 12 h. This procedure allows flat surface terrace sizes of up to 650 nm to be achieved. The crystalline quality achieved in anatase films prepared by PLD or MBE growth methods is similar. The two-step anatase growth process used during the synthesis of the films with both methods: film growth and post-annealing treatment in oxygen or air at ambient pressure, using temperature and time as key parameters, allows to control the surface terrace size and stoichiometry of the films, as well as the anatase/rutile intermixing rates at sufficiently high temperatures. This growth process could allow the substitution of their equivalent single crystals. The range of applicability of these films would include their use as structural and electronic model systems, or in harsh experimental conditions due to their low production cost