Polymorphism of Rare Earth Disilicides

Perri, J. A.; Banks, E.; Post, B.

doi:10.1021/j150582a030

Cited by 64 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…. Eremenko et al reported the polymorphic transition between α‐Pr 5 Si 9 (orthorhombic) and β‐Pr 5 Si 9 (tetragonal) at Pr‐rich Pr 5 Si 9 to be at 157°C and the temperature was 57°C at 0.353 mole fraction Pr However, Perri et al reported the polymorphic transition temperature of the Pr 5 Si 9 phase was −123 ± 15 ºC, and what's more, Boutarek et al found three individual phases in the range of 0.333 to 0.385 mole fraction Pr using XRD and metallographic techniques. Recently, Pinguet et al studied the structural chemistry, magnetism, and electrical properties of binary Pr‐silicide.…”

Section: Literature Reviewmentioning

confidence: 99%

Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics

Chang

Zhou

et al. 2020

J Am Ceram Soc

View full text Add to dashboard Cite

The Y3Si2C2 coating on the silicon carbide (SiC) powders is reported to improve the sintering process, but the relatively high sintering temperature (1600°C) restricts the engineering application. A series of thermodynamic descriptions for the SiC with light rare‐earth elements are desired to develop potential SiC‐RE3Si2C2 core‐shell structures as sintering aids with lower temperatures. Coupling the CALPHAD (CALculation of PHAse Diagram) approach and first‐principles calculations, we have investigated the RE‐Si‐C (RE = La, Ce and Pr) systems. In the SiC‐RE3Si2C2 core‐shell structures, the RE3Si2C2 phases can react with SiC via ternary eutectic reactions at 810°C, 747°C, and 1148°C respectively. The predicted thermal behaviors of the Pr3Si2C2 phase were further confirmed by our key experiments. Therefore, our database can be used to predict promising sintering aids and guide the subsequent processes.

show abstract

Section: Literature Reviewmentioning

confidence: 99%

Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics

Chang

Zhou

et al. 2020

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

“…There is an agreement that GdSi 2 has vacancy on the Si site so that the more accurate formula is GdSi 2−x ; a composition close to GdSi 1.4 was estimated by Perri et al [8] based on chemical analyses, X-ray and density measurements but the homogeneity was uncertain. A small range of homogeneity were reported ranging from 64 to 68 at.% Si [9] and 63.2 to 65.4 at.% Si [5], which corresponds to the formula GdSi 1.78-1.94 [9] and GdSi 1.72-1.89 [5], respectively; GdSi 2−x was also discovered to be dimorphic with a low temperature of orthorhombic structure and a high temperature of the ␣-ThSi 2 [10] tetragonal structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and thermodynamic modeling of the Gd–Si system

Huang

Schlagel

Schmidt

et al. 2007

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…The line compound Gd 5 Si 3 is formed by the peritectic reaction: L + Gd 5 Si 4 → Gd 5 Si 3 at 1700 • C, while the other one Gd 5 Si 4 melts incongruently at 1725 • C. On the contrary, the monosilicide GdSi melts congruently at 1830 • C and does not have a significant homogeneity range. Both phases GdSi 2−x and GdSi ∼2 were the subject of controversy in literature [2][3][4][5][6][7][8][9]. Indeed, the stoichiometric composition of the silicide GdSi 2−x of AlB 2 type was attributed to the formula Gd 2 Si 3 (GdSi 1.5 , 60 at.% Si).…”

Section: Introductionmentioning

confidence: 99%