A BCC solid phase for sodium cluster composed by 309 atoms


IEEE EDS - Third Mexico Technical Meeting 2022 (MTM_3-2022)

Mexico Chapter and CINVESTAV-IPN Student Branch Chapter

Center for Research and Advanced Studies of the National Polytechnic Institute

On the behalf of the third IEEE-EDS Mexico Technical Meeting 2022 (MTM_3-2022), organized jointly by the IEEE EDS Mexico Chapter, the IEEE EDS CINVESTAV-IPN Student Branch Chapter and the Section of Solid-State Electronics at the Center for Research and Advanced Studies of the Polytechnic National Institute (CINVESTAV-IPN), we extend the invitation for the conference with an Distinguished professor, that presents his most recent results on study a BCC solid phase for sodium cluster composed by 309 atoms.

The MTM_3-2022 will be held in Mexico City, Mexico at August 17th, 2022.

  Date and Time




  • Date: 17 Aug 2022
  • Time: 11:00 AM to 01:00 PM
  • All times are (UTC-06:00) Guadalajara
  • Add_To_Calendar_icon Add Event to Calendar
  • Co-sponsored by Jose Alfredo Santis Espinosa
  • Starts 11 August 2022 09:35 PM
  • Ends 17 August 2022 11:00 AM
  • All times are (UTC-06:00) Guadalajara
  • No Admission Charge


Prof. Juan Andres Reyes of IIIER-UNICACH


A BCC solid phase for sodium cluster composed by 309 atoms

We propose a BCC solid phase that could be adopted for an assembly of sodium clusters composed of 309 atoms. This is the structure resulting from adding one atom to the surface of a closed-layer cluster with BCC structure composed of 308 atoms. The cluster in each configuration associated with this solid phase is bonded with an energy 3.6 meV/atom lower than that acquired in its more stable (icosahedral) structure. In addition, it vibrates with frequencies lower than those with which it vibrates in its icosahedral structure. These are low enough for the assembly to acquire the BCC phase before melting. From a theoretical perspective with the harmonic approach we determine the thermodynamic properties of the assembly below its melting point. We find that it does indeed manifest a solid-solid phase transition. Our estimates of its properties: latent heat, entropy change and temperature are consistent with the available experimental data. It is therefore highly probable that the bcc phase presented here is the one previously detected by experiment. We conclude that the BCC phase has its origin in two properties of the cluster: 1) its sufficiently large size, and 2) its quasi-closed-layer structure. 



Dr. Reyes Nava is interested in Thermodynamics, Materials, and Fluid Mechanics. He is currently studying: 

1) Phase Transitions of nanoparticle assemblies, 2) Perovskites, 3) Turbines, and 4) Tesla Pumps. 

His most important contribution is the prediction of the most stable chemical order of bimetallic nanoparticles. 

He has 483 citations according to Researchgate. He is a SNI level 1 researcher. He has graduated 10 postgraduate thesis students (1 Ph.D., 9 M.Sc.) and 1 undergraduate student. 

He obtained his B.Sc. degree in Physics at BUAP in 1999 with the thesis "ROTATION CONSTANTIES OF INTERSTELLAR MOLECULES". He received his Master's degree in Science (Physics) from IFUNAM in 2003, and his PhD in Science (Physics) in 2005, also from IFUNAM, with the thesis "SOLID-LIQUID TRANSITION IN SODIUM CLUSTERS". Since 2011 he is a Full Time Researcher level C at the Institute for Research in Renewable Energies of UNICACH. 


Address:Libramiento Norte Poniente 1150, Colonia Lajas Maciel, , Tuxtla Gutierrez, Chiapas, Mexico, 29039


Schedule            Wednesday 17th—CINVESTAV-IPN CDMX, Mexico                                Speaker

 10:55 - 11:05      Presentation of Profesor Juan Andres Reyes                                               M. en C. Jose Alfredo Santis Espinosa

 11:05 - 13:00      A BCC solid phase for sodium cluster composed by 309 atoms                 Dr. Juan Andres Reyes Nava

MTM_3-2022 is an IEEE-EDS sponsored technichal meeting. Co-sponsored by the Section of Solid-Sate Electronics at the Center for Research and Advanced Studies of the National Polytechnic Institute and the Autonomous University of the Hidalgo State.