Dynamic behavior of nanometer-scale amorphous intergranular film in silicon nitride by in situ high-resolution transmission electron microscopy

Journal of the European Ceramic Society

Volumn 31, Issue 9, 2011, Pages 1835-1840

  Zhang, Zaoli ^a,b   Sigle, Wilfried ^a   Koch, Christoph T ^a   Rühle, Manfred ^a  

^a MAX PLANCK INSTITUTE FOR INTELLIGENT SYSTEMS   (Germany)

^b ERICH SCHMID INSTITUTE OF MATERIALS SCIENCE   (Austria)

Author keywords

Continuum model; In situ HRTEM; Intergranular amorphous film (IGF); Si3N4 ceramic

Indexed keywords

CONTINUUM MODEL; CRYSTAL PLANES; DYNAMIC BEHAVIORS; FORCE BALANCE MODELS; IN SITU HRTEM; IN-SITU; IN-SITU HEATING; INTERGRANULAR AMORPHOUS FILM (IGF); INTERGRANULAR FILMS; NANO-METER-SCALE; ROOM TEMPERATURE; SI3N4 CERAMIC;

AMORPHOUS FILMS; CERAMIC MATERIALS; CONTINUUM MECHANICS; EXPERIMENTS; HIGH RESOLUTION TRANSMISSION ELECTRON MICROSCOPY; SECONDARY BATTERIES; SILICON NITRIDE; TEXTURES;

AMORPHOUS SILICON;

EID: 79955483362     PISSN: 09552219     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jeurceramsoc.2011.03.016     Document Type: Article

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17. Estimation of total ionic concentrations in the amorphous phase: the composition of the original powder is 88.6wt.% Si3N4+2wt.% MgO+7.2wt.% La2O3+2.2wt.% SiO2. The amorphous phase is 11.4wt.% of the Si3N4 ceramic system. The mole concentration for MgO and La2O3 are nearly 0.011 and 0.0049mol/cm3. The concentrations of Mg2+ and La3+ in the amorphous phase are about 6.62 and 5.85(number/nm3). The total ion concentration within the whole amorphous phase is estimated to be in the range of 1×100-1×101nm-3. Here, only La3+ is assumed to provide positive charges since there is enough experimental evidence that La segregates in the interface. It should also be noted that the above estimation is the ideal case. Considering the loss of additives and the very low percentage of the IGF in the total amorphous phase (IGF only is approximately 1-0.1% of the total amorphous phase), the number density of mobile ions (La3+ concentration) located in IGF is roughly in the order of 10-3-10-2nm-3. In the calculation 5×10-3nm-3 is used. The ion charge Z, though is +3.
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