Cs–Te system

58 accepted literature values from 1 paper(s) (experimental 43, model 11, unspecified 4); 1 calculated phase diagram(s). 10 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (15) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	43
model	11
unspecified	4

Accepted values by property group
Property group	Values
invariant reaction	12
phase transition	10
formation	5
heat capacity / entropy / enthalpy	5
activity / EMF / Gibbs energy	2
crystal structure	22
other property	2

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
CsTe-15Pha.tdb	T.-N. Pham Thi, J.-C. Dumas, V. Bouineau, N. Dupin, C. Gueneau, S. Gosse, P. Benigni, P. Maugis, J. Rogez, Calphad, 48, 1-12(2015). doi:10.1016/j.calphad.2014.10.006	`ec9a78a5ef90701af86fc315b3f22a5d3d4bfd8d5d11fe34e1c81b0d55f549bd`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CsTe-15Pha.tdb	934.23	CS2TE_HT (x(Te) 0.33333) + CS5TE3 (x(Te) 0.375) + ION (x(Te) 0.39286)
CsTe-15Pha.tdb	934.23	CS2TE_HT (x(Te) 0.33333) + CS5TE3 (x(Te) 0.375) + LIQUID (x(Te) 0.39286)
CsTe-15Pha.tdb	895	CS2TE_HT (x(Te) 0.33333) + CS2TE_LT (x(Te) 0.33333) + CS5TE3 (x(Te) 0.375)
CsTe-15Pha.tdb	895	ION (x(Te) 0.27208) + CS2TE_LT (x(Te) 0.33333) + CS2TE_HT (x(Te) 0.33333)
CsTe-15Pha.tdb	729.16	CS5TE3 (x(Te) 0.375) + ION (x(Te) 0.48225) + CSTE_B2 (x(Te) 0.4898)
CsTe-15Pha.tdb	729.16	CS5TE3 (x(Te) 0.375) + LIQUID (x(Te) 0.48225) + CSTE_B2 (x(Te) 0.4898)
CsTe-15Pha.tdb	673.58	CS5TE3 (x(Te) 0.375) + CSTE_LT (x(Te) 0.4898) + CSTE_B2 (x(Te) 0.4898)
CsTe-15Pha.tdb	673.58	CSTE_LT (x(Te) 0.4898) + CSTE_B2 (x(Te) 0.4898) + ION (x(Te) 0.5464)
CsTe-15Pha.tdb	673.58	CSTE_LT (x(Te) 0.4898) + CSTE_B2 (x(Te) 0.4898) + LIQUID (x(Te) 0.5464)
CsTe-15Pha.tdb	648.26	CSTE_LT (x(Te) 0.4898) + ION (x(Te) 0.55911) + CS2TE3 (x(Te) 0.6)
CsTe-15Pha.tdb	648.26	CSTE_LT (x(Te) 0.4898) + LIQUID (x(Te) 0.55911) + CS2TE3 (x(Te) 0.6)
CsTe-15Pha.tdb	527.01	CSTE4 (x(Te) 0.8) + ION (x(Te) 0.81258) + HEXAGONAL_A8 (x(Te) 1)
CsTe-15Pha.tdb	527.01	CSTE4 (x(Te) 0.8) + LIQUID (x(Te) 0.81258) + HEXAGONAL_A8 (x(Te) 1)
CsTe-15Pha.tdb	508.54	CS2TE3 (x(Te) 0.6) + CS2TE5 (x(Te) 0.71429) + ION (x(Te) 0.72903)
CsTe-15Pha.tdb	508.54	CS2TE3 (x(Te) 0.6) + CS2TE5 (x(Te) 0.71429) + LIQUID (x(Te) 0.72903)
CsTe-15Pha.tdb	499.62	CS2TE5 (x(Te) 0.71429) + LIQUID (x(Te) 0.74799) + CSTE4 (x(Te) 0.8)
CsTe-15Pha.tdb	499.62	CS2TE5 (x(Te) 0.71429) + ION (x(Te) 0.74799) + CSTE4 (x(Te) 0.8)
CsTe-15Pha.tdb	301.33	BCC_A2 (x(Te) 0) + ION (x(Te) 7.200e-4) + CS2TE_LT (x(Te) 0.33333)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Cs–Te system (12)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
1093	congruent melting: β-Cs2Te -> L	β-Cs2Te: Cs 0.666667, Te 0.333333; L: Cs 0.666667, Te 0.333333	experimental	[1] Thi 2015 cites Chuntonov 1982	Table 1, p. 3, row 2 report
934	peritectic: Cs5Te3 -> β-Cs2Te + L	Cs5Te3: Cs 0.625, Te 0.375; β-Cs2Te: Cs 0.666667, Te 0.333333	experimental	[1] Thi 2015 cites R 1995	Table 1, p. 3, row 3 report
895	polymorphic: α-Cs2Te -> β-Cs2Te	α-Cs2Te: Cs 0.666667, Te 0.333333; β-Cs2Te: Cs 0.666667, Te 0.333333	experimental	[1] Thi 2015 cites R 1995	Table 1, p. 3, row 1 report
723	peritectic: β-CsTe -> Cs5Te3 + L	β-CsTe: Cs 0.510204, Te 0.489796; Cs5Te3: Cs 0.625, Te 0.375	experimental	[1] Thi 2015 cites R 1995	Table 1, p. 3, row 5 report
673	polymorphic: α-CsTe -> β-CsTe	α-CsTe: Cs 0.510204, Te 0.489796; β-CsTe: Cs 0.510204, Te 0.489796	experimental	[1] Thi 2015 cites R 1995	Table 1, p. 3, row 4 report
668	congruent melting: Cs2Te3 -> L	Cs2Te3: Cs 0.4, Te 0.6; L: Cs 0.4, Te 0.6	experimental	[1] Thi 2015 cites Chuntonov 1982	Table 1, p. 3, row 7 report
618	eutectic: CsTe + Cs2Te3 -> L	CsTe: Cs 0.510204, Te 0.489796; Cs2Te3: Cs 0.4, Te 0.6	experimental	[1] Thi 2015 cites R 1995	Table 1, p. 3, row 6 report
536	peritectic: CsTe4 -> Te + L	CsTe4: Cs 0.2, Te 0.8	experimental	[1] Thi 2015 cites Chuntonov 1982	Table 1, p. 3, row 10 report
536	peritectic		experimental	[1] Thi 2015 cites Chuntonov 1982	p. 3 report	For the same reason, the invariant temperature 536 K measured by Chuntonov et al. [16] is attributed to the peritectic decomposition of CsTe4.
508	peritectic: Cs2Te5 -> L + Cs2Te3	Cs2Te5: Cs 0.285714, Te 0.714286; Cs2Te3: Cs 0.4, Te 0.6	experimental	[1] Thi 2015 cites Chuntonov 1982	Table 1, p. 3, row 8 report
498	peritectic		experimental	[1] Thi 2015	p. 3 report	In the composition range of this peritectic reaction, Adamson and Leighty have reported an experimental temperature of 498 K.
488	eutectic: CsTe4 + Cs2Te5 -> L	CsTe4: Cs 0.2, Te 0.8; Cs2Te5: Cs 0.285714, Te 0.714286	experimental	[1] Thi 2015 cites Chuntonov 1982	Table 1, p. 3, row 9 report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Cs–Te system (5)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Cs2Te	Cs2Te	-120.467 kJ/mol-atom ± 1.06667	298.15	experimental	-109.246 (mp-aaabgqtv)	-99.985 (oqmd-1343671)	[1] Thi 2015 cites Cordfunke 1987 doi	Table 3, p. 4, row 1 report
Cs5Te3	Cs5Te3	-117.775 kJ/mol-atom ± 1.0375	298.15 (>)	model	-107.426 (mp-aaacppvd)	-94.605 (oqmd-6410)	[1] Thi 2015 cites SGTE 2010	Table 3, p. 4, row 6 report
Cs5Te3	Cs5Te3	-117.775 kJ/mol-atom ± 8300	298.15	experimental	-107.426 (mp-aaacppvd)	-94.605 (oqmd-6410)	[1] Thi 2015 cites R 1997	Table 3, p. 4, row 8 report
Cs₂Te		-361.4 kJ/mol (basis unstated) ± 3.2	298.15	experimental			[1] Thi 2015 cites Cordfunke 1987 doi	Table 3, p. 4, row 1 report
Cs₅Te₃		-942.2 kJ/mol (basis unstated) ± 8.3	298.15 (>)	model			[1] Thi 2015 cites SGTE 2010	Table 3, p. 4, row 6 report

Other properties

Phase transition (10)

Phase transition, Cs–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	393 K	393	CsTe4	experimental	[1] Thi 2015	p. 2 report	The existence of CsTe4 is confirmed and structural transitions in this compound are identified at 393 K and 498 K.
Phase transition	498 K	498	CsTe4	experimental	[1] Thi 2015	p. 2 report	The existence of CsTe4 is confirmed and structural transitions in this compound are identified at 393 K and 498 K.
Phase transition	508 K	508	Cs2Te5	experimental	[1] Thi 2015	p. 3 report	Cs2Te5 melts incongruently at 508 K.
Phase transition	515 K	515	other	experimental	[1] Thi 2015	p. 3 report	A second order transition in Cs5Te3 is observed around 515 K.
Phase transition	668 K	668	Cs2Te3	experimental	[1] Thi 2015 cites Chuntonov 1982	p. 2 report	- The melting of Cs2Te3 was found at 668 K in [16] instead of 707 K in [14].
Phase transition	668 K	668	Cs2Te3	experimental	[1] Thi 2015 cites Chuntonov 1982	p. 3 report	The melting temperature 668 K of Cs2Te3 is taken from Chuntonov et al. [16].
Phase transition	707 K	707	Cs2Te3	experimental	[1] Thi 2015 cites Adamson 1983 doi	p. 2 report	- The melting of Cs2Te3 was found at 668 K in [16] instead of 707 K in [14].
Phase transition	707 K	707	Cs2Te3	experimental	[1] Thi 2015	p. 3 report	As already mentioned for the high Te alloy, this value is judged more reliable than the measurement of Adamson and Leighty (707 K).
Phase transition	953 K	953	congruent transformation	experimental	[1] Thi 2015 cites Bergmann 1937 doi	p. 2 report	In 1937, Bergmann [27] reported a congruent melting point of Cs2Te at 953 K which is nowadays judged as a too low value.
Phase transition	1093 K	1093	congruent transformation	experimental	[1] Thi 2015 cites Chuntonov 1982	p. 3 report	Cs2Te presents a structural transition at 895 72 K [17] and congruent melting at 1093 K measured by Chuntonov et al. [16].

Heat capacity / entropy / enthalpy (5)

Heat capacity / entropy / enthalpy, Cs–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: S0	61.7 J/mol-atom/K	298.15	Cs2Te alloy: Te 0.333333	experimental	[1] Thi 2015 cites Cordfunke 1987 doi	Table 3, p. 4, row 2 report
Entropy printed: S0	60 J/mol-atom/K ± 0.625	298.15	Cs5Te3 alloy: Te 0.375	model	[1] Thi 2015 cites R 1997	Table 3, p. 4, row 9 report
Entropy printed: S0	480 unknown ± 5	298.15	Cs5Te3 alloy: Te 0.375	model	[1] Thi 2015 cites R 1997	Table 3, p. 4, row 9 report
Entropy printed: S0	185.1 J/mol (basis unstated)/K	298.15	Cs₂Te alloy: Te 0.333333	experimental	[1] Thi 2015 cites Cordfunke 1987 doi	Table 3, p. 4, row 2 report
Entropy printed: S0	480 J/mol (basis unstated)/K ± 5	298.15	Cs₅Te₃ alloy: Te 0.375	model	[1] Thi 2015 cites R 1997	Table 3, p. 4, row 9 report

Activity / EMF / Gibbs energy (2)

Activity / EMF / Gibbs energy, Cs–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Vapour pressure printed: P(Cs)/P(Cs2Te2)	1 unspecified	1105	Cs2Te	experimental	[1] Thi 2015 cites Ball 1992	p. 5 report	at 1146 K with the results of Drowart and Smoes at 1105 K, the maximum temperature reached in their experiments, some discrepancies are denoted: - The three major species in [44] are Cs, Cs2Te2 and Te with a ratio P(Cs)/P(Cs2Te2)E 2.5, the other minor species being CsTe2, CsTe, Te3, Cs2Te and Te2 by order of decreasing abundance, - The three major species in [30] are Cs, Cs2Te2 and CsTe with a ra…
Vapour pressure printed: P(Cs)/P(Cs2Te2)	2.5 unspecified	1146	Cs2Te	experimental	[1] Thi 2015 cites Portman 1989 doi	p. 5 report	Comparing the results obtained by Portman et al. at 1146 K with the results of Drowart and Smoes at 1105 K, the maximum temperature reached in their experiments, some discrepancies are denoted: - The three major species in [44] are Cs, Cs2Te2 and Te with a ratio P(Cs)/P(Cs2Te2)E 2.5, the other minor species being CsTe2, CsTe, Te3, Cs2Te and Te2 by order of decreasing abundance,

Crystal structure (22)

Crystal structure, Cs–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	5.2 Å		β-CsTe β-CsTe: Cs 0.509, Te 0.491	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 6 report
Lattice a	8.666 Å	298.15	Cs2Te3 Cs2Te3: Cs 0.4, Te 0.6	experimental	[1] Thi 2015 cites Bottcher 1980 doi	Table 2, p. 4, row 8 report
Lattice a	9.37 Å	298.15	Cs2Te5 Cs2Te5: Cs 0.286, Te 0.714	model	[1] Thi 2015 cites Kretschmann 1982 doi	Table 2, p. 4, row 9 report
Lattice a	7.857 Å	298.15	CsTe4 CsTe4: Cs 0.2, Te 0.8	unspecified	[1] Thi 2015 cites Bottcher 1985 doi	Table 2, p. 4, row 10 report
Lattice a	9.109 Å	298.15	α-Cs2Te α-Cs2Te: Cs 0.667, Te 0.333	model	[1] Thi 2015 cites Maeda 1994	Table 2, p. 4, row 3 report
Lattice a	21.11 Å	298.15	α-Cs5Te3 α-Cs5Te3: Cs 0.625, Te 0.375	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 5 report
Lattice a	11.1639 Å	298.15	α-CsTe α-CsTe: Cs 0.509, Te 0.491	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 7 report
Lattice b	12.065 Å	298.15	Cs2Te3 Cs2Te3: Cs 0.4, Te 0.6	experimental	[1] Thi 2015 cites Bottcher 1980 doi	Table 2, p. 4, row 8 report
Lattice b	12.28 Å	298.15	Cs2Te5 Cs2Te5: Cs 0.286, Te 0.714	model	[1] Thi 2015 cites Kretschmann 1982 doi	Table 2, p. 4, row 9 report
Lattice b	7.286 Å	298.15	CsTe4 CsTe4: Cs 0.2, Te 0.8	unspecified	[1] Thi 2015 cites Bottcher 1985 doi	Table 2, p. 4, row 10 report
Lattice b	11.486 Å	298.15	α-Cs2Te α-Cs2Te: Cs 0.667, Te 0.333	model	[1] Thi 2015 cites Maeda 1994	Table 2, p. 4, row 3 report
Lattice b	6.655 Å	298.15	α-Cs5Te3 α-Cs5Te3: Cs 0.625, Te 0.375	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 5 report
Lattice b	6.1309 Å	298.15	α-CsTe α-CsTe: Cs 0.509, Te 0.491	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 7 report
Lattice c	8.68 Å	298.15	Cs2Te3 Cs2Te3: Cs 0.4, Te 0.6	experimental	[1] Thi 2015 cites Bottcher 1980 doi	Table 2, p. 4, row 8 report
Lattice c	10.12 Å	298.15	Cs2Te5 Cs2Te5: Cs 0.286, Te 0.714	model	[1] Thi 2015 cites Kretschmann 1982 doi	Table 2, p. 4, row 9 report
Lattice c	14.155 Å	298.15	CsTe4 CsTe4: Cs 0.2, Te 0.8	unspecified	[1] Thi 2015 cites Bottcher 1985 doi	Table 2, p. 4, row 10 report
Lattice c	5.867 Å	298.15	α-Cs2Te α-Cs2Te: Cs 0.667, Te 0.333	model	[1] Thi 2015 cites Maeda 1994	Table 2, p. 4, row 3 report
Lattice c	15.07 Å	298.15	α-Cs5Te3 α-Cs5Te3: Cs 0.625, Te 0.375	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 5 report
Lattice c	4.9669 Å	298.15	α-CsTe α-CsTe: Cs 0.509, Te 0.491	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 7 report
lattice beta	93.83 °	298.15	CsTe4 CsTe4: Cs 0.2, Te 0.8	unspecified	[1] Thi 2015 cites Bottcher 1985 doi	Table 2, p. 4, row 10 report
lattice beta	134.53 °	298.15	α-Cs5Te3 α-Cs5Te3: Cs 0.625, Te 0.375	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 5 report
lattice gamma	90 °		β-Cs5Te3 β-Cs5Te3: Cs 0.625, Te 0.375	experimental	[1] Thi 2015 cites R 1995	Table 2, p. 4, row 4 report

Other property (2)

Other property, Cs–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Transition enthalpy printed: Enthalpy of α/β transition of Cs2Te	1950 J/mol ± 230		Cs₂Te alloy: Te 0.333333	experimental	[1] Thi 2015 cites R 1995	Table 3, p. 4, row 4 report
Transition enthalpy printed: Enthalpy of melting of β-Cs2Te	7100 J/mol ± 1000		β-Cs₂Te alloy: Te 0.333333	experimental	[1] Thi 2015 cites R 1995	Table 3, p. 4, row 5 report

Sources

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

T.-N. Pham Thi, J.-C. Dumas, V. Bouineau, N. Dupin, C. Guéneau, S. Gossé et al., Thermodynamic assessment of the Cs–Te binary system, Calphad 48, 1-12 (2015). doi:10.1016/j.calphad.2014.10.006

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}
}