SciAct
Toggle navigation
  • EN
  • RU

Sections:

  • Articles
  • Books
  • Conference attendances
  • Conference theses
  • Patents

Synthesis of Nanocrystalline Calcium Aluminate C12A7 under Carbon Nanoreactor Conditions Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Materials Letters
ISSN: 0167-577X , E-ISSN: 1873-4979
Output data Year: 2017, Volume: 189, Pages: 210-212 Pages count : 3 DOI: 10.1016/j.matlet.2016.11.112
Tags C12A7, Carbon Nanoreactor, Ceramic composites, Electride, EPR, Nanocomposites
Authors Volodin Alexander M. 1 , Zaikovskii Vladimir I. 1,2 , Kenzhin Roman M. 1 , Bedilo Alexander F. 1 , Mishakov Ilya V. 1,3 , Vedyagin Aleksey A. 1,3
Affiliations
1 Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russia
2 Novosibirsk State University, Novosibirsk 630090, Russia
3 National Research Tomsk Polytechnic University, Tomsk 634050, Russia

Funding (1)

1 Russian Science Foundation 16-13-10168

Abstract: Recently we have shown that carbon coating supported on the surface of oxide nanoparticles is able to stabilize their size and prevent sintering at high temperatures. The carbon shell can play the role of a nanoreactor where phase or chemical transformations of nanoparticles take place. In the present study the carbon nanoreactor approach was used to study the C12A7:eˉ electride synthesis in the argon atmosphere. For these systems the appearance of free electrons registered by electron paramagnetic resonance (EPR) was observed at moderate temperatures (starting from 1250 °C). In the presence of the carbon shell the material maintains relatively high dispersity even at 1450 °C, which exceeds the melting temperature for C12A7. The possibility of increasing substitution of oxygen anions with electrons in C12A7@C systems was examined by increasing calcination temperature from 1200 up to 1450 °C. Highly sensitive EPR method for qualitative and quantitative characterization of these systems was proposed. It was shown that in absence of the carbon coating conduction electrons appear only at temperatures close to the melting point (above 1360 – 1380 °C). The electride formation inside the carbon shell occurs due to carbothermal reduction of C12A7 nanoparticles encapsulated inside the shell.
Cite: Volodin A.M. , Zaikovskii V.I. , Kenzhin R.M. , Bedilo A.F. , Mishakov I.V. , Vedyagin A.A.
Synthesis of Nanocrystalline Calcium Aluminate C12A7 under Carbon Nanoreactor Conditions
Materials Letters. 2017. V.189. P.210-212. DOI: 10.1016/j.matlet.2016.11.112 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Sep 17, 2016
Accepted: Nov 30, 2016
Published online: Nov 30, 2016
Published print: Feb 15, 2017
Identifiers:
publication_identifier.wos_identifier_type WOS:000393248000054
publication_identifier.scopus_identifier_type 2-s2.0-85006375550
publication_identifier.rinz_identifier_type 29447244
publication_identifier.accession_number_identifier_type 2016:2132352
publication_identifier.chemical_accession_number_identifier_type 166:179554
Altmetrics: