Dilatometric studies of the phase transitions of sodium potassium tartrate tetrahydrate (RS)

1988 ◽  
Vol 9 (3) ◽  
pp. 83-88 ◽  
Author(s):  
Marek Wlodarz ◽  
Wieslawa Bronowska ◽  
Janusz Dziedzic
Keyword(s):  
Phase Transitions ◽  
Sodium Potassium ◽  
Sodium Potassium Tartrate ◽  
Potassium Tartrate ◽  
Dilatometric Studies

Some anomalous optical properties of freshly-prepared mixed crystals of the Seignette salts

1924 ◽  
Vol 20 (104) ◽  
pp. 159-172 ◽  
Author(s):  
Harold E. Buckley
Keyword(s):  
Circular Polarization ◽  
Axial Plane ◽  
Continuous Series ◽  
Ammonium Tartrate ◽  
Crystalline Compound ◽  
Remarkable Property ◽  
Sodium Potassium ◽  
Sodium Potassium Tartrate ◽  
Potassium Tartrate ◽  
Rhombic System

The new crystalline compound triphenyl-bismuthine dichloride, described crystallographically by Mr. G. Greenwood (Min. Mag., 1923, vol. 20, p. 123), possesses the remarkable property of exhibiting crossed axial-plane dispersion of the rhombic ‘brookite’ type and circular polarization. For purposes of comparison, the author prepared specimens of the mixed Seiguette salts, which also exhibit crossed axial-plane dispersion together with circular polarization. The Seignette salts, sodium-potassium tartrate and sodium-ammonium tartrato, crystallize each with four molecules of water ill the bisphenoidal class of the rhombic system. They are truly isomorphous and form a continuous series of mixtures. The acute bisectrix for sodium-ammonium tartrate is normal to (001)and for sodium-potassium tartrate normal to (100). For all proportions of mixture containing 5 % and over of sodium-ammonium tartrate, the acute bisectrix is normal to (001).

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