A mass spectrometric study of the vaporization of boron phosphate (BPO4)

Abstract

The vaporization behavior of boron phosphate has been studied by using Knudsen effusion mass spectrometry. The vapor over BPO(4) consists of B(2)O(3), P(4)O(10), PO(2), BPO(4) (platinum cell) and B(2)O(3), PO, PO(2), BPO(3), BPO(4) (molybdenum cell). Standard enthalpies of formation and atomization (kJ/mol) were derived for BPO(4) (g) (-1000 +/- 15 and 2863 +/- 16) and for BPO(3) (g) (-731 +/- 15 and 2347 +/- 16), respectively. Copyright 1999 John Wiley & Sons, Ltd.

Thermodynamic study of gaseous tin molybdates by high‐temperature mass spectrometry

“…) for the isocation series of tin salts. The analogous dependence for the isocation series of gaseous tin salts may be derived using the values for the formation and atomization enthalpies obtained in the present investigation for gaseous SnMoO 4 , Sn 2 MoO 5 and SnMo 2 O 7 together with the atomization enthalpies of gaseous SnPO 2 , SnPO 3 , SnWO 4 , Sn 2 WO 5 and SnW 2 O 7 . This dependence is displayed in Fig.…”

“…The existence of seven gaseous tin(II) salts has now been established: SnPO 2 , SnPO 3 , SnWO 4 , Sn 2 WO 5 , SnW 2 O 7 , SnMoO 4 and Sn 2 MoO 5 . All these salts were produced by gas‐phase synthesis in situ in a Knudsen cell from the relevant oxides.…”

Mass Spectrometric Study of Stability, Thermochemistry and Structures of the Gaseous Oxyacid Salts

“…Oxides possessing strongly pronounced acid properties and playing the role of anion-forming oxides are located in the end of the electronegativity scale. In the middle of the scale there are oxides which, according to the electronegativity values, can act as both cation-and anion- [164], molybdates [165,166], niobate [166], and tungstates [166,167] are known on the one hand, and barium germanate [168] on the other; beryllium oxide {beryllium phosphates, molybdates, and tungstates [169,170] vs. alkaline-earth metal beryllates [169]; and also boron oxide B 2 O 3 {boron phosphates [171] vs. alkaline-earth metal metaborates [172,173]}. Chromium(II), iron(II), cobalt(II), and nickel(II) oxides also have amphoteric properties [140].…”