Lithium metaphosphate

Procedure Place 0.2 g of sample into a ceramic weigh boat. Mix in a small amount of comcat (100 g of tungstic anhydride and 15 g of 97% lithium metaphosphate) to facilitate combustion. Analyze the sample through the system. 

Leuchs anhydride 599 lithium diphosphate 582 lithium metaphosphate 581—582... 

The reduction of phosphates by carbon is a classical method, but the purity of phosphides obtained this way can be suspect. This also holds for replacement reactions, in which a redox process between a transition metal and a metal phosphide is used for the preparation of phosphides with high thermal stability. Binary main-group element and transition metal phosphides like AlP, CrP, NbP, MoP, or WP can be prepared by the reaction of the powdered metals with a melt of lithium metaphosphate LiP03. Bulk samples of transition metal phosphides like C02P or NiMoP can be obtained via reduction of metal oxide/phosphate mixtures in a mixture of 5% H2 in N2. MoP, WP, Fe2P, Ni2P, FeP, and RuP can be synthesized by direct reduction of the transition metal phosphates in hydrogen atmosphere between 670 and 1320 K. ... 

As shown in Ikble 20-2, lithium chloride humidity sensors have rather slow responses to humidity compared to other types of humidity sensors. This type of humitidy sensor cannot, therefore, be used in automatic control systems which require a rapid response. They are, however, widely used for meteorological observations such as radiosonde because of their reproducibility, long term stability, and low cost [7]. Care should be taken when using this type of sensor in very humid environments because the accuracy and lifetime are lowered. Thin films of potassium metaphosphate [9] and barium fluorite [10] are also used as humidity sensors. The film of potassium metaphosphate is deposited on a glass substrate by vacuum sublimation and Ag paste is used as the electrodes. Such sensors show a response to humidity within 2 s, but are not stable [9]. 

This volume presents and evaluates solubility data for the orthophosphates of lithium, sodium, potassium, rubidium and cesium. There are two exceptions to this (a) data are presented for the solubility of sodium metaphosphate in water (1) on page 46 in chapter 3 and (b) solubility values for the system (2) are given on... 

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