Viscosity of molten alkali molybdates, tungstates, and sulfates

R.G. Gossink, J.M. Stevels

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

The viscosities of molten M2MoO4 and M2WO4 (M = Li, Na, K) have been detd. as a function of temp. up to 1000 Deg by the method of the oscillating hollow cylinder. Viscosity values, ranging from 2 to 10 cP, are higher for the tungstates than for the corresponding molybdates and decrease in the order Li -> Na -> K. In addn., viscosity values of Li2SO4 and Na2SO4 are reported, in order to allow a comparison with the behavior of other high-melting salts with complex anions. The relations between viscosity and temp. can be represented satisfactorily by an Arrhenius equation. Values of the activation energy for viscous flow Eh are as follows (in kcal mole-1): Li2MoO4, 7.0; Na2MoO4, 6.8; K2MoO4, 5.1; Li2WO4, 12.0; Na2WO4, 9.2; K2WO4, 8.6; Li2SO4, 12.8; Na2SO4, 10.0. The Eh values are predicted reasonable well by the semiempirical relation Eh = 3.7 RTm. The relatively low values of the ratio Eh/EL, i.e., activation energy of viscosity vs. activation energy of equiv. conductivity, in the case of molten alkali molybdates, tungstates, and sulfates would suggest that the melts have a more or less assocd. character. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)2180-2182
JournalInorganic Chemistry
Volume11
Issue number9
DOIs
Publication statusPublished - 1972

Fingerprint

tungstates
molybdates
Alkalies
Sulfates
Molten materials
sulfates
alkalies
Viscosity
viscosity
Activation energy
activation energy
Oscillating cylinders
viscous flow
Viscous flow
Anions
hollow
Melting
Salts
melting
molybdate

Cite this

@article{2d6ff985ea6a42e38bd9801049b737e3,
title = "Viscosity of molten alkali molybdates, tungstates, and sulfates",
abstract = "The viscosities of molten M2MoO4 and M2WO4 (M = Li, Na, K) have been detd. as a function of temp. up to 1000 Deg by the method of the oscillating hollow cylinder. Viscosity values, ranging from 2 to 10 cP, are higher for the tungstates than for the corresponding molybdates and decrease in the order Li -> Na -> K. In addn., viscosity values of Li2SO4 and Na2SO4 are reported, in order to allow a comparison with the behavior of other high-melting salts with complex anions. The relations between viscosity and temp. can be represented satisfactorily by an Arrhenius equation. Values of the activation energy for viscous flow Eh are as follows (in kcal mole-1): Li2MoO4, 7.0; Na2MoO4, 6.8; K2MoO4, 5.1; Li2WO4, 12.0; Na2WO4, 9.2; K2WO4, 8.6; Li2SO4, 12.8; Na2SO4, 10.0. The Eh values are predicted reasonable well by the semiempirical relation Eh = 3.7 RTm. The relatively low values of the ratio Eh/EL, i.e., activation energy of viscosity vs. activation energy of equiv. conductivity, in the case of molten alkali molybdates, tungstates, and sulfates would suggest that the melts have a more or less assocd. character. [on SciFinder (R)]",
author = "R.G. Gossink and J.M. Stevels",
year = "1972",
doi = "10.1021/ic50115a038",
language = "English",
volume = "11",
pages = "2180--2182",
journal = "Inorganic Chemistry",
issn = "0020-1669",
publisher = "American Chemical Society",
number = "9",

}

Viscosity of molten alkali molybdates, tungstates, and sulfates. / Gossink, R.G.; Stevels, J.M.

In: Inorganic Chemistry, Vol. 11, No. 9, 1972, p. 2180-2182.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Viscosity of molten alkali molybdates, tungstates, and sulfates

AU - Gossink, R.G.

AU - Stevels, J.M.

PY - 1972

Y1 - 1972

N2 - The viscosities of molten M2MoO4 and M2WO4 (M = Li, Na, K) have been detd. as a function of temp. up to 1000 Deg by the method of the oscillating hollow cylinder. Viscosity values, ranging from 2 to 10 cP, are higher for the tungstates than for the corresponding molybdates and decrease in the order Li -> Na -> K. In addn., viscosity values of Li2SO4 and Na2SO4 are reported, in order to allow a comparison with the behavior of other high-melting salts with complex anions. The relations between viscosity and temp. can be represented satisfactorily by an Arrhenius equation. Values of the activation energy for viscous flow Eh are as follows (in kcal mole-1): Li2MoO4, 7.0; Na2MoO4, 6.8; K2MoO4, 5.1; Li2WO4, 12.0; Na2WO4, 9.2; K2WO4, 8.6; Li2SO4, 12.8; Na2SO4, 10.0. The Eh values are predicted reasonable well by the semiempirical relation Eh = 3.7 RTm. The relatively low values of the ratio Eh/EL, i.e., activation energy of viscosity vs. activation energy of equiv. conductivity, in the case of molten alkali molybdates, tungstates, and sulfates would suggest that the melts have a more or less assocd. character. [on SciFinder (R)]

AB - The viscosities of molten M2MoO4 and M2WO4 (M = Li, Na, K) have been detd. as a function of temp. up to 1000 Deg by the method of the oscillating hollow cylinder. Viscosity values, ranging from 2 to 10 cP, are higher for the tungstates than for the corresponding molybdates and decrease in the order Li -> Na -> K. In addn., viscosity values of Li2SO4 and Na2SO4 are reported, in order to allow a comparison with the behavior of other high-melting salts with complex anions. The relations between viscosity and temp. can be represented satisfactorily by an Arrhenius equation. Values of the activation energy for viscous flow Eh are as follows (in kcal mole-1): Li2MoO4, 7.0; Na2MoO4, 6.8; K2MoO4, 5.1; Li2WO4, 12.0; Na2WO4, 9.2; K2WO4, 8.6; Li2SO4, 12.8; Na2SO4, 10.0. The Eh values are predicted reasonable well by the semiempirical relation Eh = 3.7 RTm. The relatively low values of the ratio Eh/EL, i.e., activation energy of viscosity vs. activation energy of equiv. conductivity, in the case of molten alkali molybdates, tungstates, and sulfates would suggest that the melts have a more or less assocd. character. [on SciFinder (R)]

U2 - 10.1021/ic50115a038

DO - 10.1021/ic50115a038

M3 - Article

VL - 11

SP - 2180

EP - 2182

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

IS - 9

ER -