Zur Chemie der kondensierten Phosphate und Arsenate. XVI. Die sich durch thermisches Entwässern an freier Atmosphäre bildenden kondensierten Phosphate der zweiwertigen lonen des Ca, Sr, Ba und Pb und der dreiwertigen des Al, Fe, Cr und Bi

Abstract

Die im allgemeinen sehr komplizierten Bildungsweisen der kondensierten Phosphate des Ca, Sr, Ba, Pb, Al, Cr, FeIII und Bi werden beschrieben, ihre Konstitution und Widersprüche in Literaturangaben aufgeklärt.

Alkaline Earth Phosphates.

“…Evidence for 8 ( 2 04)2• 20 has been reported (136,178,198), but this hydrate does not appear to be stable under normal atmospheric conditions (178).…”

“…Preparation and x-ray data for the fired products of the monobasic calcium orthophosphates have been most recently summarized by McIntosh and Jablonski (133), their summary being based partially upon the data of previous authors (14,30,92,94,95). In table 5 the nomenclature given in these sources is correlated with more precise and definitive notations evolved from studies using paper chromatography (156,198).…”

Engineering Techniques applied for studies by Infrared vibration, crystallographic characterization and Thermal Behavior of two new cyclotriphosphates

“…Cyclotriphosphates associated to two divalent cations are rare, in fact, the only one well characterized till now by A. Durif and al [1] is ZnBa 2 (P 3 O 9 ) 2 .10H 2 O. That's why we made our research on such cyclotriphosphates.…”

“…In the first case, a well crystallized product is obtained, but it is not possible to grow monocrystals of a suitable size for a structural study. In the second case, after a 2 We have prepared the anhydrous cyclotriphosphate of manganese and dicalcium, MnCa 2 (P 3 O 9 ) 2 , directly by the method of THILO et al [1] in the dry form powder. The diammonium mono hydrogenomonophosphate, (NH 4 ) 2 HPO 4 , in excess and the calcium and manganese carbonates respectively CaCO 3 and MnCO 3 are intimately ground and heated at 500°C, under atmospheric pressure, in a porcelain crucible, according to the following chemical reaction:…”

“…The results described previously show that MnCa 2 (P 3 O 9 ) 2 was obtained from two different ways. The first being the total thermal dehydration of MnCa 2 (P 3 O 9 ) 2 between 400 and 450°C and the second is the direct synthesis by the method of THILO et al [1].…”