Re: [QE-users] forcing Sn(iv) or Sn(0) charges in a MASnI3 crystal

2019-04-24 Thread dv009200
Dear Julien, I remember that some time ago as I learned about Quantum ESPRESSO I viewed an old conference contribution (from the Quantum ESPRESSO Tutorial recommendations) about DFT+U from Matteo Cococcioni. There he had an example where the calculation of Li0.5FePO4 led to an charge of 2.5 on

Re: [QE-users] forcing Sn(iv) or Sn(0) charges in a MASnI3 crystal

2019-04-24 Thread José Carlos Conesa
Hi, Most probably the proper way to do this change in Sn redox state is to add or suppress some atom in the lattice, or change it for an ion having naturally another valence; this is surely the way in which the mentioned degradation proceeds. Note also that the location of the modified charge

Re: [QE-users] forcing Sn(iv) or Sn(0) charges in a MASnI3 crystal

2019-04-24 Thread JULIEN, CLAUDE, PIERRE BARBAUD
; julien_barb...@sjtu.edu.cn Subject: Re: [QE-users] forcing Sn(iv) or Sn(0) charges in a MASnI3 crystal Sorry, different issue - you can change the number of electrons in the unit cell, and hope they go or leave from the right place. Sent from a tiny keyboard... Contact info: http://theossrv1

Re: [QE-users] forcing Sn(iv) or Sn(0) charges in a MASnI3 crystal

2019-04-23 Thread Marzari Nicola
Sorry, different issue - you can change the number of electrons in the unit cell, and hope they go or leave from the right place. Sent from a tiny keyboard... Contact info: http://theossrv1.epfl.ch/Main/Contact On 24 Apr 2019, at 00:32, Marzari Nicola mailto:nicola.marz...@epfl.ch>> wrote:

Re: [QE-users] forcing Sn(iv) or Sn(0) charges in a MASnI3 crystal

2019-04-23 Thread Marzari Nicola
Here is a discussion http://theossrv1.epfl.ch/Main/OxidationStates Sent from a tiny keyboard... Contact info: http://theossrv1.epfl.ch/Main/Contact On 24 Apr 2019, at 00:28, JULIEN, CLAUDE, PIERRE BARBAUD mailto:julien_barb...@sjtu.edu.cn>> wrote: Dear users, I am working on a MASnI3

[QE-users] forcing Sn(iv) or Sn(0) charges in a MASnI3 crystal

2019-04-23 Thread JULIEN, CLAUDE, PIERRE BARBAUD
Dear users, I am working on a MASnI3 crystal. In this structure, the Sn can usually be considered as a Sn2+ cation. I ran some calculations on the system, and performed a Bader charge analysis on an all-electron paw charge density. It seems to confirm that the tin is in Sn(2) configuration