Synthesis of Ir1-xRex (0.15 ≤ x ≤ 0.40) solid solutions under high-pressure and high-temperature

Gromilov, S. A.; D’yachkova, T. V.; Bykova, Elena; Tarakina, Nadezda V.; Zaynulin, Yurii G.; Yusenko, K. V.

doi:10.3139/146.110884

Cited by 1 publication

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To experimentally prove the tendency, hcp-Ir 0.7 Re 0.3 and fcc-Rh 0.5 Re 0.5 alloys were investigated ex situ under moderate pressures and temperatures (1-2 GPa and 2500 K) [6][7][8]. High experimental errors and small pressure response did not allow us to prove pressure dependence of phase stability in systems investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Since the components exhibit limited solubility in each other, the corresponding phase diagrams contain two solid solubility regions based on hcp-/fcc-structure and a miscibility gap in between. It is however possible to synthesize metastable solid solutions with compositions corresponding to a miscibility gap region using thermal decomposition of the single-phase bimetallic precursors [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-pressure high-temperature stability of hcp-Ir Os1− (x = 0.50 and 0.55) alloys

Yusenko

Bykova

Bykov

et al. 2017

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Hcp-Ir 0.55 Os 0.45 and hcp-Ir 0.50 Os 0.50 alloys were synthesised by thermal decomposition of single-source precursors in hydrogen atmosphere. Both alloys correspond to a miscibility gap in the Ir─Os binary phase diagram and therefore are metastable at ambient conditions. An in situ powder X-ray diffraction has been used for a monitoring a formation of hcp-Ir 0.55 Os 0.45 alloy from (NH 4) 2 [Ir 0.55 Os 0.45 Cl 6 ] precursor. A crystalline intermediate compound and nanodimentional metallic particles with a large concentration of defects has been found as key intermediates in the thermal decomposition process in hydrogen flow. High-temperature stability of titled hcp-structured alloys has been investigated upon compression up to 11 GPa using a multi-anvil press and up to 80 GPa using laser-heated diamond-anvil cells to obtain a phase separation into fcc+hcp mixture. Compressibility curves at room temperature as well as thermal expansion at ambient pressure and under compression up to 80 GPa were collected to obtain thermal expansion coefficients and bulk moduli. hcp-Ir 0.55 Os 0.45 alloy shows bulk moduli B 0 =395 GPa. Thermal expansion coefficients were estimated as α = 1.6•10-5 K-1 at ambient pressure and α = 0.3•10-5 K-1 at 80 GPa. Obtained high-pressure high-temperature data allowed us to construct the first model for pressure-dependent Ir─Os phase diagram.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%