Ge–Sr system

40 accepted literature values from 1 paper(s) (experimental 20, model 20); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (9) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	20
model	20

Accepted values by property group
Property group	Values
invariant reaction	17
phase transition	1
crystal structure	22

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
GeSr-09Du.tdb	Y. Du, L. Li, J. Wang, J. Wang, Z. Jin, Calphad, 33, 719-22(2009). doi:10.1016/j.calphad.2009.09.004	`d90bda144b6419120b46a6976d7e4265d1f0ca57181b5b35df2c2c82e7b6c9e4`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
GeSr-09Du.tdb	1431.43	LIQUID (x(Sr) 0.61838) + GE3SR5_D8L (x(Sr) 0.625) + GESR2_C37 (x(Sr) 0.66667)
GeSr-09Du.tdb	1431.43	LIQUID (x(Sr) 0.61842) + GE3SR5_D8L (x(Sr) 0.625) + GESR2_C37 (x(Sr) 0.66667)
GeSr-09Du.tdb	1431.43	LIQUID (x(Sr) 0.61846) + GE3SR5_D8L (x(Sr) 0.625) + GESR2_C37 (x(Sr) 0.66667)
GeSr-09Du.tdb	1374.19	GESR_B33 (x(Sr) 0.5) + LIQUID (x(Sr) 0.56815) + GE3SR5_D8L (x(Sr) 0.625)
GeSr-09Du.tdb	1374.19	GESR_B33 (x(Sr) 0.5) + LIQUID (x(Sr) 0.56826) + GE3SR5_D8L (x(Sr) 0.625)
GeSr-09Du.tdb	1374.19	GESR_B33 (x(Sr) 0.5) + LIQUID (x(Sr) 0.56803) + GE3SR5_D8L (x(Sr) 0.625)
GeSr-09Du.tdb	1242.68	GE2SR (x(Sr) 0.33333) + LIQUID (x(Sr) 0.38939) + GESR_B33 (x(Sr) 0.5)
GeSr-09Du.tdb	1242.68	GE2SR (x(Sr) 0.33333) + LIQUID (x(Sr) 0.3895) + GESR_B33 (x(Sr) 0.5)
GeSr-09Du.tdb	1201.89	GESR_B33 (x(Sr) 0.5) + GE3SR5_D8L (x(Sr) 0.625) + GESR2_C37 (x(Sr) 0.66667)
GeSr-09Du.tdb	1028.66	DIAMOND_A4 (x(Sr) 0) + LIQUID (x(Sr) 0.17551) + GE2SR (x(Sr) 0.33333)
GeSr-09Du.tdb	1028.66	DIAMOND_A4 (x(Sr) 0) + LIQUID (x(Sr) 0.17537) + GE2SR (x(Sr) 0.33333)
GeSr-09Du.tdb	1015.2	GESR2_C37 (x(Sr) 0.66667) + LIQUID (x(Sr) 0.95765) + BCC_A2 (x(Sr) 1)
GeSr-09Du.tdb	820	GESR2_C37 (x(Sr) 0.66667) + FCC_A1 (x(Sr) 1) + BCC_A2 (x(Sr) 1)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Ge–Sr system (17)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
1463.15	congruent melting: L -> GeSr2	L: Sr 0.667; GeSr2: Ge 0.333333, Sr 0.666667	model	[1] Du 2009	Table 4, p. 3, row 14 report
1463.15	congruent melting: L -> GeSr2	L: Sr 0.667; GeSr2: Ge 0.333333, Sr 0.666667	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 13 report
1453.15	congruent melting: L -> GeSr	L: Sr 0.5; GeSr: Ge 0.5, Sr 0.5	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 7 report
1450.15	congruent melting: L -> GeSr	L: Sr 0.5; GeSr: Ge 0.5, Sr 0.5	model	[1] Du 2009	Table 4, p. 3, row 8 report
1433.15	L + GeSr2 -> Ge3Sr5	L: Sr 0.615; GeSr2: Ge 0.333333, Sr 0.666667; Ge3Sr5: Ge 0.375, Sr 0.625	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 11 report
1431.15	L + GeSr2 -> Ge3Sr5	L: Sr 0.618; GeSr2: Ge 0.333333, Sr 0.666667; Ge3Sr5: Ge 0.375, Sr 0.625	model	[1] Du 2009	Table 4, p. 3, row 12 report
1374.15	eutectic: L -> GeSr + Ge3Sr5	L: Sr 0.568; GeSr: Ge 0.5, Sr 0.5; Ge3Sr5: Ge 0.375, Sr 0.625	model	[1] Du 2009	Table 4, p. 3, row 10 report
1373.15	eutectic: L -> GeSr + Ge3Sr5	L: Sr 0.58; GeSr: Ge 0.5, Sr 0.5; Ge3Sr5: Ge 0.375, Sr 0.625	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 9 report
1288.15	congruent melting: L -> Ge2Sr	L: Sr 0.333; Ge2Sr: Ge 0.666667, Sr 0.333333	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 3 report
1284.15	congruent melting: L -> Ge2Sr	L: Sr 0.333; Ge2Sr: Ge 0.666667, Sr 0.333333	model	[1] Du 2009	Table 4, p. 3, row 4 report
1258.15	peritectic: L + Ge2 Sr ↔ Ge1.85 Sr		experimental	[1] Du 2009 cites Palenzona 2005 doi	p. 2 report	In the Ge-Sr phase diagram presented by Palenzona and Pani [3], the phase Ge1.85 Sr is tentatively suggested to be stable in an extremely narrow temperature range, being formed via a peritectic reaction L + Ge2 Sr ↔ Ge1.85 Sr at about 985 ◦ C.
1243.15	eutectic: L -> Ge2Sr + GeSr	L: Sr 0.389; Ge2Sr: Ge 0.666667, Sr 0.333333; GeSr: Ge 0.5, Sr 0.5	model	[1] Du 2009	Table 4, p. 3, row 6 report
1238.15	eutectic: L -> Ge2Sr + GeSr	L: Sr 0.39; Ge2Sr: Ge 0.666667, Sr 0.333333; GeSr: Ge 0.5, Sr 0.5	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 5 report
1029.15	eutectic: L -> (Ge) + Ge2Sr	L: Sr 0.175; Ge2Sr: Ge 0.666667, Sr 0.333333	model	[1] Du 2009	Table 4, p. 3, row 2 report
1028.15	eutectic: L -> (Ge) + Ge2Sr	L: Sr 0.16; Ge2Sr: Ge 0.666667, Sr 0.333333	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 1 report
1015.15	eutectic: L -> GeSr2 + (βSr)	L: Sr 0.958; GeSr2: Ge 0.333333, Sr 0.666667	model	[1] Du 2009	Table 4, p. 3, row 16 report
1013.15	eutectic: L -> GeSr2 + (βSr)	L: Sr 0.95; GeSr2: Ge 0.333333, Sr 0.666667	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 4, p. 3, row 15 report

Other properties

Phase transition (1)

Phase transition, Ge–Sr system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1201.85 K	1201.85	other: Ge3Sr5 = GeSr + GeSr2	model	[1] Du 2009	p. 3 report	The present calculations indicate that Ge3 Sr5 decomposes into GeSr and GeSr2 at 928.7 ◦ C.

Crystal structure (22)

Crystal structure, Ge–Sr system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	8.912 Å		Ge2Sr alloy: Sr 0.333333	model	[1] Du 2009	Table 1, p. 2, row 2 report
Lattice a	8.172 Å		Ge3Sr5 alloy: Sr 0.625	model	[1] Du 2009	Table 1, p. 2, row 6 report
Lattice a	4.847 Å		GeSr alloy: Sr 0.5	model	[1] Du 2009	Table 1, p. 2, row 4 report
Lattice a	8.185 Å		GeSr2 alloy: Sr 0.666667	model	[1] Du 2009	Table 1, p. 2, row 8 report
Lattice a	8.752 Å ± 0.006	298.15	Ge2Sr alloy: Sr 0.333333	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 1 report
Lattice a	8.181 Å ± 0.001	298.15	Ge3Sr5 alloy: Sr 0.625	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 5 report
Lattice a	4.827 Å ± 0.002	298.15	GeSr alloy: Sr 0.5	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 3 report
Lattice a	8.179 Å ± 0.003	298.15	GeSr2 alloy: Sr 0.666667	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 7 report
Lattice b	6.596 Å		Ge2Sr alloy: Sr 0.333333	model	[1] Du 2009	Table 1, p. 2, row 2 report
Lattice b	11.531 Å		GeSr alloy: Sr 0.5	model	[1] Du 2009	Table 1, p. 2, row 4 report
Lattice b	5.197 Å		GeSr2 alloy: Sr 0.666667	model	[1] Du 2009	Table 1, p. 2, row 8 report
Lattice b	6.586 Å ± 0.003	298.15	Ge2Sr alloy: Sr 0.333333	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 1 report
Lattice b	11.386 Å ± 0.003	298.15	GeSr alloy: Sr 0.5	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 3 report
Lattice b	5.176 Å ± 0.002	298.15	GeSr2 alloy: Sr 0.666667	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 7 report
Lattice c	11.236 Å		Ge2Sr alloy: Sr 0.333333	model	[1] Du 2009	Table 1, p. 2, row 2 report
Lattice c	15.98 Å		Ge3Sr5 alloy: Sr 0.625	model	[1] Du 2009	Table 1, p. 2, row 6 report
Lattice c	4.22 Å		GeSr alloy: Sr 0.5	model	[1] Du 2009	Table 1, p. 2, row 4 report
Lattice c	9.682 Å		GeSr2 alloy: Sr 0.666667	model	[1] Du 2009	Table 1, p. 2, row 8 report
Lattice c	11.238 Å ± 0.005	298.15	Ge2Sr alloy: Sr 0.333333	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 1 report
Lattice c	15.779 Å ± 0.005	298.15	Ge3Sr5 alloy: Sr 0.625	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 5 report
Lattice c	4.178 Å ± 0.001	298.15	GeSr alloy: Sr 0.5	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 3 report
Lattice c	9.62 Å ± 0.005	298.15	GeSr2 alloy: Sr 0.666667	experimental	[1] Du 2009 cites Palenzona 2005 doi	Table 1, p. 2, row 7 report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

Yong Du, Lingling Li, Jiong Wang, Jianchuan Wang, Zhanpeng Jin, A thermodynamic description of the Ge–Sr system acquired via a hybrid approach of CALPHAD and first-principles calculations, Calphad 33, 719-722 (2009). doi:10.1016/j.calphad.2009.09.004

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0). Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}