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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaSO4 by Materials Project

NaSO4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Na is bonded to six O atoms to form distorted NaO6 pentagonal pyramids that share corners with six equivalent SO4 tetrahedra and edges with three equivalent NaO6 pentagonal pyramids. There are a spread of Na–O bond distances ranging from 2.39–2.66 Å. S is bonded to four O atoms to form SO4 tetrahedra that share corners with six equivalent NaO6 pentagonal pyramids. There is three shorter (1.46 Å) and one longer (1.66 Å) S–O bond length. There are four inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to two equivalent Na and one S atom. In the second O site, O is bonded in a distorted water-like geometry to one S and one O atom. The O–O bond length is 1.51 Å. In the third O site, O is bonded in a 3-coordinate geometry to two equivalent Na and one S atom. In the fourth O site, O is bonded in a 3-coordinate geometry to two equivalent Na and one S atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaSO4 by Materials Project

NaSO4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded to six O atoms to form distorted NaO6 octahedra that share corners with six SO4 tetrahedra and an edgeedge with one NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.41–2.54 Å. In the second Na site, Na is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Na–O bond distances ranging from 2.43–2.72 Å. There are two inequivalent S sites. In the first S site, S is bonded to four O atoms to form SO4 tetrahedra that share corners with four equivalent NaO6 octahedra. The corner-sharing octahedra tilt angles range from 32–56°. There are a spread of S–O bond distances ranging from 1.48–1.50 Å. In the second S site, S is bonded to four O atoms to form SO4 tetrahedra that share corners with two equivalent NaO6 octahedra. The corner-sharing octahedra tilt angles range from 57–70°. There is three shorter (1.48 Å) and one longer (1.49 Å) S–O bond length. There are eight inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to one Na and one S atom. In the second O site, O is bonded in a 4-coordinate geometry to three Na and one S atom. In the third O site, O is bonded in a 3-coordinate geometry to two equivalent Na and one S atom. In the fourth O site, O is bonded in a 1-coordinate geometry to two Na and one S atom. In the fifth O site, O is bonded in a distorted bent 150 degrees geometry to one Na and one S atom. In the sixth O site, O is bonded in a 1-coordinate geometry to two Na and one S atom. In the seventh O site, O is bonded in a distorted bent 150 degrees geometry to one Na and one S atom. In the eighth O site, O is bonded in a distorted trigonal planar geometry to two Na and one S atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaH2CSO4F3 by Materials Project

NaSO4H2CF3 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of four fluoroform molecules; four hydrogen molecules; and one NaSO4 sheet oriented in the (1, 0, 0) direction. In the NaSO4 sheet, Na1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.28–2.76 Å. S4+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of S–O bond distances ranging from 1.44–1.59 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Na1+ and one O2- atom. The O–O bond length is 1.51 Å. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one S4+, and one O2- atom. In the third O2- site, O2- is bonded in a single-bond geometry to one S4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Na1+ and one S4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaCSCl3O4 by Materials Project

NaSO4CCl3 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of four chloroform molecules and one NaSO4 sheet oriented in the (0, 0, 1) direction. In the NaSO4 sheet, Na1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.33–2.50 Å. S6+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There is two shorter (1.46 Å) and one longer (1.47 Å) S–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent Na1+ atoms. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to one Na1+ and one S6+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Na1+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Na1+ and one S6+ atom.

36 MATERIALS SCIENCE↗
NASA NTRS1976

Hot corrosion studies of four nickel-base superalloys: B-1900, NASA-TRW VIA, 713C and IN738

The susceptibility to hot corrosion of four nickel base superalloys has been studied at 900 deg and 1000 deg C in one atmosphere of slowly flowing oxygen. Hot corrosion was induced by coating the samples with known doses of NaSO4 and oxidizing the coated samples isothermally on a sensitive microbalance. In general, the order of susceptibility found was: B-1900 is greater than 713C is greater than NASA-TRW VIA and is greater than IN738. This order corresponds to the order of decreasing molybdenum content of the alloys. Chemical evidence for B-1900 indicates that hot corrosion is instigated by acid fluxing of the protective Al2O3 coating by MoO3.

Fryburg, G. C.↗
NASA NTRS1977

Theoretical and experimental studies of the deposition of Na2SO4 from seeded combustion gases

A basic point in the hot corrosion of turbine components is the deposition of sodium sulfate from flames containing sodium and sulfur. An experimental study is described which examines a dew point prediction theory based on the local thermochemical equilibrium (LTCE) method, and a means to calculate the deposition rate is suggested. In addition, a convective diffusion theory, based on the assumption of a chemically frozen boundary layer, utilizing the LTCE results, and imposing the additional effects of mass transport, was also successful in predicting dew points for Na2SO4-seeded combustion gases. A multicomponent mass transfer equation was derived to predict NaSO4 deposition rate via vapor transport at temperatures below the deposition onset temperature.

Kohl, F. J.↗
NASA NTRS1978

Experimental Studies of the Formation/Deposition of Sodium Sulfate in/from Combustion Gases

Processes related to the hot corrosion of gas turbine components were examined in two separate investigations. Monochromatic laser light was used to probe condensation onset and condensate film growth (via interference of reflected light) on electrically heated ribbons immersed in seeded, flat flame combustion product gases. Boron trichloride is used as the seed gas in these preliminary experiments conducted to obtain precise measurements of the dew point/deposition rates. Because of the importance of gaseous Na(g) as a precursor to NaSO4 formation, the kinetics and mechanisms of the heterogeneous reaction H(g) + NaCl(s) yields Na(g) + HCl(g) was studied using atomic absorption spectroscopy combined with microwave discharge-vacuum flow reactor techniques at moderate temperatures. Preliminary results indicate the H-atom attack of solid NaCl vaporization is negligible; hence the corresponding gas phase (homogeneous) reaction no role in the observed Na(g) production.

Rosner, D. E.↗
NASA NTRS1993

Corrosion of Silicon-Based Ceramics in Combustion Environments

The processes of passive oxidation, deposit-induced corrosion, active oxidation, scale/substance interactions, and scale volatility are presently studied in the case of high-purity SiC and Si3N4 in pure oxygen, giving attention to such secondary elements in the ceramics as water and CO2 oxidants, combustion environment impurities, and thermal cycling. Deposit-induced corrosion is discussed for the cases of NaSO4 as well as vanadate and oxide-slag deposits; issues associated with the active-to-passive oxidation transition are noted.

Jacobson, Nathan S.↗