BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:SNSS Seminar Series: Neutron Diffraction\, Speaker 2 - Non-equilib rium phases and cation mixing in Li-rich rock salt derived positive electr ode materials DTSTART;VALUE=DATE-TIME:20210511T113000Z DTEND;VALUE=DATE-TIME:20210511T120000Z DTSTAMP;VALUE=DATE-TIME:20260528T084012Z UID:indico-contribution-171-1074@lindico453.srv.lu.se DESCRIPTION:Speakers: William Brant (Uppsala University)\nOften within the domain of inorganic chemistry synthesis\, focus is placed on obtaining id eal materials under equilibrium conditions in order to accurately study sp ecific phenomena. However\, while extremely valuable\, these studies often do not represent the real structures which are formed when materials are utilized in an application or a device. This is particularly true in the c ase of electrode materials for rechargeable ion batteries where it is noto riously difficult to predict what phases are formed as electrochemical ext raction of charged ions proceeds far from the thermodynamically stable con figuration of a material. In this contribution I will present results from two different Li-rich rock salt derived oxide systems\, Li1+xTM1-xO2 (0 ≤ x ≤ ⅓\, TM= Mn\, Ni and Co) and Li2VO2F. Both compounds do not exh ibit ideal structures and the properties are intricately tied to the local cation configurations generated via non-equilibrium phase transitions.\nT he structure of lithium rich layered phases\, Li1+xTM1-xO2\, is complicate d by disorder which manifests over multiple length scales. At the atomic s cale Li and TM cations can order forming a superstructure\, this superstru cture allows for the appearance of stacking faults which extends beyond th e unit cell. Finally\, phase segregation of different ordered domains can occur on the nano to micron length scale. The disorder present can vary si gnificantly even for a single composition depending upon the specific synt hesis conditions. These multiple metastable phases which exhibit near iden tical average structures has confounded research into these materials\, hi ndering an understanding of their anionic redox properties.\nLi2VO2F is a metastable disordered rock salt structure which shows promise as a high ca pacity cathode material. However\, significant capacity fade during electr ochemical cycling impedes its implementation. Understanding the origin of the capacity fade is challenging due to the reconstructive phase transitio n that occurs upon lithium extraction. One might expect that over time the structure converts to more thermodynamically stable structures that are l ess electrochemically active. However\, using a combination of X-ray and n eutron diffraction\, we demonstrate that this is not the case and that oth er crystalline metastable phases stabilise and grow over successive electr ochemical cycles.\n\nhttps://lindico453.srv.lu.se/event/214/contributions/ 1074/ LOCATION: URL:https://lindico453.srv.lu.se/event/214/contributions/1074/ END:VEVENT BEGIN:VEVENT SUMMARY:SNSS Seminar Series: Neutron Diffraction\, Speaker 4 - Additive ma nufacturing and neutron diffraction: Residual stress assessment and contro l DTSTART;VALUE=DATE-TIME:20210511T123000Z DTEND;VALUE=DATE-TIME:20210511T130000Z DTSTAMP;VALUE=DATE-TIME:20260528T084012Z UID:indico-contribution-171-1076@lindico453.srv.lu.se DESCRIPTION:Speakers: Prabhat Pant (Linköping University)\nAdditive manuf acturing (AM) of components made out of metals using powder and laser has been in increasing demand especially in the sector of aerospace\, medical sectors\, etc. With AM\, parts with complex geometries can be manufactured easily in comparison to the traditional ones. However\, with the ease of\ nmanufacturing complex parts\, several issues must be tackled to get a goo d quality party without losing its mechanical integrity. One of such issue s is the control of residual stresses (RS). These RS are generated mainly due to the temperature difference between the consecutive layers while pri nting. For a comprehensive and systematic study of different process param eters such as print orientations and scan strategies two separate studies on L-shaped geometry printed out of IN718 superalloy were done. The first study was on print orientation\nwhere parts were printed in different orie ntations namely: horizontal (HB)\, vertical (VB)\, and 45° angle (45B)\, and for the second study parts were printed in the vertical orientation wi th different scan strategies. With the help of neutron diffraction\, RS di stribution in the bulk of the sample and the influence of these printing p arameters on the RS magnitude and distribution were studied. For the print orientation study\, it was found that\npart built in a Vertical orientati on has the highest magnitude of RS and for the scan strategies' influence\ , it was found that different scan strategies can lead to the reduction of RS in the same part printed in the vertical orientation. From the data av ailable from the experiment\, a simplified FEM model to predict the RS due to print orientation was also established. The model can predict the RS d istribution trend similar to that measured ones but with a higher magnitud e of stresses. Further data from the neutron diffraction results can be us ed to calibrate the existing models for the prediction of RS in AM or to v erify new models as well.\n\nhttps://lindico453.srv.lu.se/event/214/contri butions/1076/ LOCATION: URL:https://lindico453.srv.lu.se/event/214/contributions/1076/ END:VEVENT BEGIN:VEVENT SUMMARY:SNSS Seminar Series: Neutron Diffraction\, Speaker 3 - Magnetic di ffraction: Exploring hidden magnetic symmetries DTSTART;VALUE=DATE-TIME:20210511T120000Z DTEND;VALUE=DATE-TIME:20210511T123000Z DTSTAMP;VALUE=DATE-TIME:20260528T084012Z UID:indico-contribution-171-1075@lindico453.srv.lu.se DESCRIPTION:Speakers: Johan Cedervall (Stockholm University)\nMagnetic mat erials are found everywhere and in all sorts of applications in the societ y today and new applications are constantly being developed. Some examples are generators in\nwindmills and electrical motors and magnetic cooling. In addition\, to effectively operate a generator\, it requires several typ es of specialised magnetic materials. To understand materials\nmagnetic be haviour\, good knowledge of its structure is required\, something that dif fraction methods can provide. Neutrons weak interaction with matter\, give n their uncharged state\, makes them interact with the nuclei and in a non -magnetised material\, the nuclear structure can be explored. However\, gi ven that neutrons also carries a magnetic moment\, they will interact with unpaired electrons in a material\, giving an additional scattering featur e\, i.e. magnetic scattering. In the non-magnetised paramagnetic state\, t his additional scattering will be diffuse\, whereas in a magnetised state sharp Bragg peaks will occur.\nIn this talk\, I will explore a variety of magnetic materials with different magnetic interactions and guide you thro ugh how the magnetic structures where resolved. To do so\, the basics of\n magnetic symmetries and their relation to conventional symmetries and spac e groups will be covered. The shown scientific examples will cover both ma terials with interesting magnetic interactions as well as materials that h as a potential to be used in applications as permanent magnets or magnetic refrigeration.\n\nhttps://lindico453.srv.lu.se/event/214/contributions/10 75/ LOCATION: URL:https://lindico453.srv.lu.se/event/214/contributions/1075/ END:VEVENT BEGIN:VEVENT SUMMARY:SNSS Seminar Series: Neutron Diffraction\, Speaker 1 - Surfactants \, Solvents & Silica: Probing self-assembly in solution DTSTART;VALUE=DATE-TIME:20210511T110000Z DTEND;VALUE=DATE-TIME:20210511T113000Z DTSTAMP;VALUE=DATE-TIME:20260528T084012Z UID:indico-contribution-171-1073@lindico453.srv.lu.se DESCRIPTION:Speakers: Karen Edler (University of Bath)\nThe self-assembly of surfactant micelles is important in many applications from controlling the rheology and cleaning properties of personal care products to templati ng pore\nstructures in inorganic materials. The size and shape of cationic micelles can be controlled via their interaction with their soluble count er-anions\, and this is well known to affect properties such as the critic al micelle concentration. However\, although the bulk properties of such s olutions have been studied using a range of techniques including conductiv ity and small angle scattering\, it is difficult to directly measure the i nteractions between the surfactant headgroups and ions in solution. Much o f the literature description of these systems is therefore inferred from t hese bulk measurements. We have used wide angle neutron scattering on solu tions of decyltrimethylammonium cations\, which have been ion exchanged to contain a range of counteranions\, along the Hofmeister series\, to direc tly probe interactions in these systems. The data was modelled using Empir ical Potential Structure Refinement (EPSR) to study the association betwee n the different counterions and the micelle surfaces and how this affects micellar structures in these systems.\n\nhttps://lindico453.srv.lu.se/even t/214/contributions/1073/ LOCATION: URL:https://lindico453.srv.lu.se/event/214/contributions/1073/ END:VEVENT END:VCALENDAR