Thermoelectric Power of Molten and Solid Silver Sulphate

Abstract

measurement, which makes the correction factor rather uncertain.The influence of end-effects (zlZ-effects) on the results of the capillary method has recently been discussed by several authors. BOCKRIS et al. 7 claim that it is impossible to avoid zl/-errors even if the flow rate past the capillary mouth is carefully chosen. According to SPEDDING and MILLS 8 , on the other hand, the Al error will be negligible for certain flow rates. Since the investigation by DWORKIN The above results show, that the paper strip technique can be used for self-diffusion measurements in molten salts if a correction for the exchange of metal ions between the glass and the melt is applied when necessary. The glass-melt interface is very large, and this fact, in conjunction with the comparatively long diffusion times that are needed, enhances the exchange. (A somewhat similar situation is encountered in the porous frit technique 2 ' 3 , but the corresponding problem is by no means so serious, since the diffusion times are of the order of 30 minutes only.) Due to the difficulty to determine the correction factor accurately, the paper strip method is not capable of the highest precision. It is, on the other hand, very simple to use, and it is able to give valuable independent checks of the results of other methods. This work has been financially supported by "Adlerbertska Forskningsfonden", which is gratefully acknowledged. Thanks are due to Mr. W. PARKER for making the radioactive samples. The thermocell Ag(7 , 1)/Ag2 S04/Ag(r2) has been studied over the temperature range 420 to 750 °C. The results can be described by the following linear relations 1 -£1= (0.31 ±0.01) mV/°C (657-750 °C) --£s= [(0.687 + 0.011) -(0.472 + 0.019) -10 3 -mV/°C (420-657 °C) £1 and £s are the SEEBECK-coefficients of molten silver sulphate and the a-modification, respectively, and tm is the mean temperature of the salt column in °C. Thermoelectric Power of Molten and Solid Silver SulphateThe standard deviation of es was 4.3 • 10 -3 mV/°C. The transported entropy of the silver ion and of the sulphate ion have been calculated. A discontinuous change of the emf and the transported entropies was found at the melting point.

Ultrathin 2D silver sulphate nanosheets for visible-light-driven NO2 sensing at room temperature

“…Compressed air, as an oxygen precursor, was used throughout the entire oxidation reaction at 600 1C, which was close to the melting point of Ag 2 SO 4 . 41 The annealed bulk powder, before use in further processes, was subjected to analysis using XRD, which revealed the successful conversion of Ag 2 S to Ag 2 SO 4 (Fig. S2, ESI †).…”

Thermal Diffusion in Crystalline Solids

“…Measurements of for other ionic conducting solids with reversible electrodes are available. Unfortunately, these are for materials in which the defect structure may perhaps be simple but is at present not well enough studied to allow detailed interpretations, e.g., PbCl2 (135), PbBr2 (135), Pbl2 (141), Cul (94), CuBr (141), or in which the structure is such that interpretation in terms of simple vacancy or interstitial mechanisms is not possible, e.g., Agl (93,95), Ag2S04 (95), and AgNOs (169).…”