Abstracts Book - IMRC 2018

• SA6-P113
THERMODINAMIC STUDY ON Zn3MgO4. THEIR SYNTHESIS, AND
STRUCTURAL CHARACTERIZATION.
Daniel Ivan Guillen Carrillo 1 , Elizabeth Chavira 1 , Karla Eriseth Morales Reyes 2 , Adriana Tejeda
Cruz 3 , Jesús Angel Arenas Alatorre 4 , Jorge Barreto 4 , Roberto Sato 5
1
Instituto de Investigaciones en Materiales, Materiales de baja dimensionalidad, Mexico.
2 Instituto de Investigaciones en Materiales, Departamento de polimeros, Mexico. 3 Instituto de
Investigaciones en Materiales, Departamento de metálicos y cerámicos, Mexico. 4 Instituto de
Física - Universidad Nacional Autónoma de México, Instituto de Física, Mexico. 5 Universidad
Nacional Autónoma de México, Laboratorio LUCE, Mexico.
In recent decades, a new family of ternary superconductors based on zinc was
discovered. This system combines zinc, magnesium and oxygen to achieve
transition temperatures (Tc 152 K) superconducting in the range of copper
oxides.
The synthesis was carried out by reaction in the solid state, starting the
corresponding oxide reagents of each metal; thermogravimetric analysis, TGA,
differential scanning calorimeter, DSC, RAMAN and powder X-ray diffraction,
XRD, characterized the reagents and the product obtained. Magnetic
measurements provide information on the behavior of the solid solution of
Zn3MgO4.
Our interest was to study the thermodynamic stability in the zinc-based
superconducting compound. They took their binary phase diagram (MgO-ZnO),
and then worked around 66% -33%. TGA to check the phases present in the
material and gives us the mass change that has a different behavior when we
take the thermograms at different speeds 5, 10 and 20 ºC / min. DSC also
presents the caloric results when the mass loss and sometimes has a result that
was not related to the TGA data. The explanation was that the caloric was more
sensitive than the mass of loss. XRD confirmed the purity of the reagents, the
crystalline structure, the thermodynamic stability of the compounds and the
formation of solid solutions. RAMAN gives us the preservation of ZnO in the
mixture of the two solid solutions.
The synthesis of the compound will be carried out to exemplify the theory of the
extreme metals of valence +1 and +2, which explains that when two metals of
different valence (+2 and +1) comply with the rules of Hume - Rothery ( with a
difference in atomic weights no greater than 14% and with a low difference in