strontium
- Formula: Sr
- Molecular weight: 87.62
- IUPAC Standard InChI: InChI=1S/Sr
- IUPAC Standard InChIKey: CIOAGBVUUVVLOB-UHFFFAOYSA-N
- CAS Registry Number: 7440-24-6
- Chemical structure:
This structure is also available as a 2d Mol file - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Options:
Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Gas phase ion energetics data, NIST Free Links, NIST Subscription Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 39.197 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1983 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 39.350 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1983 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 1685.492 to 2700. | 2700. to 6000. |
|---|---|---|
| A | 4.626411 | -9.321850 |
| B | 0.893844 | -0.405473 |
| C | -0.762223 | 1.908730 |
| D | 0.208125 | -0.203539 |
| E | 0.012908 | 44.83850 |
| F | 37.82689 | 84.75999 |
| G | 44.78760 | 58.18700 |
| H | 39.19699 | 39.19699 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in September, 1983 | Data last reviewed in September, 1983 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, NIST Free Links, NIST Subscription Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | 0.22 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1983 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 12.17 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1983 |
Liquid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 1050. to 1685.492 |
|---|---|
| A | 9.431891 |
| B | -5.377830×10-11 |
| C | 2.976631×10-11 |
| D | -5.144331×10-12 |
| E | -1.674740×10-12 |
| F | -2.594479 |
| G | 23.57960 |
| H | 0.217735 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1983 |
Solid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 298. to 1050. | 298. to 1050. |
|---|---|---|
| A | 5.707990 | 6.300620 |
| B | 2.222120 | 0.998406 |
| C | 0.219867 | 0.001401 |
| D | 0.008423 | -0.000412 |
| E | 0.001179 | -0.000023 |
| F | -1.798610 | -1.633560 |
| G | 19.55290 | 20.99200 |
| H | 0.000000 | 0.289436 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | α phase; Data last reviewed in September, 1983 | β phase; Data last reviewed in September, 1983 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, NIST Free Links, NIST Subscription Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
L - Sharon G. Lias
Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
View reactions leading to Sr+ (ion structure unspecified)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| IE (evaluated) | 5.69484 ± 0.00002 | eV | N/A | N/A | L |
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 0.052038 ± 0.000044 | N/A | Andersen, Petrunin, et al., 1997 | B |
| 0.0480 ± 0.0060 | LPD | Berkovits, Boaretto, et al., 1995 | B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 5.69484 | EVAL | Lide, 1992 | LL |
| 5.5 ± 0.5 | EI | Asano and Kou, 1988 | LL |
| 5.5 ± 0.3 | EI | Kleinschmidt and Hildenbrand, 1978 | LLK |
| 5.5 | PE | Hildenbrand, 1977 | LLK |
| ~5.7 | EI | Okudaira, 1970 | RDSH |
| 5.69484 ± 0.00002 | S | Moore, 1970 | RDSH |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, NIST Free Links, NIST Subscription Links, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Andersen, Petrunin, et al., 1997
Andersen, H.H.; Petrunin, V.V.; Kristensen, P.; Andersen, T.,
Structural properties of the negative strontium ion: Binding energy and fine-structure splitting,
Phys. Rev. A, 1997, 55, 4, 3247-3249, https://doi.org/10.1103/PhysRevA.55.3247
. [all data]
Berkovits, Boaretto, et al., 1995
Berkovits, D.; Boaretto, E.; Ghelberg, S.; Heber, O.; Paul, M.,
Electron affinity of strontium,
Phys. Rev. Lett., 1995, 75, 3, 414, https://doi.org/10.1103/PhysRevLett.75.414
. [all data]
Lide, 1992
Lide, D.R. (Editor),
Ionization potentials of atoms and atomic ions
in Handbook of Chem. and Phys., 1992, 10-211. [all data]
Asano and Kou, 1988
Asano, M.; Kou, T.,
Thermochemical properties of SrBO2(g) and SrB2O4(s),
J. Chem. Thermodyn., 1988, 20, 1149. [all data]
Kleinschmidt and Hildenbrand, 1978
Kleinschmidt, P.D.; Hildenbrand, D.L.,
Dissociation energies of CaI, SrI, and BaI from high temperature mass spectrometry,
J. Chem. Phys., 1978, 68, 2819. [all data]
Hildenbrand, 1977
Hildenbrand, D.L.,
Dissociation energies of CaBr, SrBr, BaBr, and BaCl from mass spectrometric studies of gaseous equilibria,
J. Chem. Phys., 1977, 66, 3526. [all data]
Okudaira, 1970
Okudaira, S.,
Multiple ionization of Ca, Sr and Ba by electron impact,
J. Phys. Soc. Jpn., 1970, 29, 409. [all data]
Moore, 1970
Moore, C.E.,
Ionization potentials and ionization limits derived from the analyses of optical spectra,
Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, NIST Free Links, NIST Subscription Links, References
- Symbols used in this document:
EA Electron affinity IE (evaluated) Recommended ionization energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.