TY - JOUR

T1 - Synthesis, vaporization and thermodynamic properties of superfine yttrium aluminum garnet.

AU - Sevastyanov, V.G.

AU - Simonenko, E.P.

AU - Simonenko, N.P.

AU - Stolyarova, V.L.

AU - Lopatin, S.I.

AU - Vorozhtcov, V.A.

AU - Kuznetsov, N.T.

PY - 2018/10/5

Y1 - 2018/10/5

N2 - The study of high temperature behavior of Y 3Al 5O 12 is urgently required for development of high temperature materials of the new generation including ultra-high temperature ceramics. The superfine Y 3Al 5O 12 powder was obtained by the glycol-citrate method; the aggregation process of the sample synthesized was investigated under calcination conditions at different temperatures. Using the Knudsen effusion mass spectrometric method vaporization processes and thermodynamic properties of Y 3Al 5O 12 as well as of the melts in the Y 2O 3-Al 2O 3 system were studied at temperatures higher than 2270 K. The simultaneous transition to the gaseous phase of both Al 2O 3 and Y 2O 3 from the melt under study was observed during isothermal keeping of the Y 3Al 5O 12 sample at the temperature 2675 K with the predominant alumina removal. Analysis of the values of the thermodynamic properties obtained in the Y 2O 3-Al 2O 3 system showed negative deviations from ideal behavior despite the possibility of existence of the miscibility gap at the temperature 2675 K.

AB - The study of high temperature behavior of Y 3Al 5O 12 is urgently required for development of high temperature materials of the new generation including ultra-high temperature ceramics. The superfine Y 3Al 5O 12 powder was obtained by the glycol-citrate method; the aggregation process of the sample synthesized was investigated under calcination conditions at different temperatures. Using the Knudsen effusion mass spectrometric method vaporization processes and thermodynamic properties of Y 3Al 5O 12 as well as of the melts in the Y 2O 3-Al 2O 3 system were studied at temperatures higher than 2270 K. The simultaneous transition to the gaseous phase of both Al 2O 3 and Y 2O 3 from the melt under study was observed during isothermal keeping of the Y 3Al 5O 12 sample at the temperature 2675 K with the predominant alumina removal. Analysis of the values of the thermodynamic properties obtained in the Y 2O 3-Al 2O 3 system showed negative deviations from ideal behavior despite the possibility of existence of the miscibility gap at the temperature 2675 K.

KW - Ceramics

KW - High-temperature chemistry

KW - Massspectrometry

KW - Oxide materials

KW - Thermodynamic properties

KW - Vaporization

UR - http://www.scopus.com/inward/record.url?scp=85048431094&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2018.06.060

DO - 10.1016/j.jallcom.2018.06.060

M3 - Article

VL - 764

SP - 397

EP - 405

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -