Manganese niobate

Typical electrostrictive materials include such compounds as lead manganese niobate lead titanate (PMN PT) and lead lanthanium 2irconate titanate (PLZT). Electrostriction is a fourth-rank tensor property observed in both centric and acentric insulators (14,15). 

Another manganese niobate, 3Mn0.5Nb205, has been obtained by adding manganese sulphate to potassium niobate and fusing the precipitate with boric acid. It consists of small, greyish-yellow, prismatic rods, density 4-97.1... 

Electrostrictive materials are materials that exhibit a quadratic relationship between mechanical stress and the square of the electnc polarization. Electrostriction can occur in any material. Whenever an electric field is applied, the induced charges attract each other, thus, causing a compressive force. Tlus attraction is independent of the sign of the electnc field. Typical electrostrictive materials include such compounds as lead manganese niobate, lead titanate (PMN FT), and lead lanthanium zirconate titanate (PLZT). 

Lead-lithium alloys, 14 779 Lead-lithium-tin alloys, 14 779 Lead magnesium niobate (PMN), 5 583 Lead manganese niobaterlead titanate (PMN PT), 22 713... 

Lithium-magnesium alloys, 15 135 Lithium manganate(V), 15 592 Lithium-manganese dioxide cells, 3 461 characteristics, 3 462t Lithium metaborate, 15 137 Lithium metaborate octahydrate, 4 277 Lithium metal, 15 132 uses for, 15 134 Lithium metal films, 15 128 Lithium methoxide, 15 148 Lithium nickelate, 15 142 Lithium niobate, 15 141 17 153... 

Nowadays a large number of functional crystals belongs to the TTB family and presents electro-optic, ferro- piezo- pyroelectric properties (e g. the well-known barium sodium niobate Ba2NaNb50i5 (BNN)). In this work iron and manganese based Kx(lvr%(]Vr )i-xF3 fluorides (0.4solid state reaction and characterised by different diffraction techniques in order to investigate their crystalline stmcture. 

Wohlerite is a niobate of calcium, iron, manganese, sodium, etc., associated with considerable quantities of zirconia and silica. It is found in Norway. Other silicates which contain niobium or tantalum are struverite10 and ilmenorutile.11... 

Manganese is a hard but brittle grayish-white metallic element (symbol Mn atomic no. 25) that occurs in nature chiefly in the form of its oxides, but is also found as a sulfide (for example in alabandite), carbonate (ankerite, dialogite, and rhodochrosite), niobate and tantalate (columbite), sihcate (piedmontite, rhodonite, spessartite, and tephroite), arsenate (sjmadelphite), and tungstate (wolframite). 

Niobium and tantalum (both rare, 3x 10 %) are extracted (Fig. 243) from a mineral which is a mixed niobate and tantalate of iron and manganese, (Fe,Mn) (Nb,Ta,Og)2. When it contains more niobium than tantalum it is known as columbite, otherwise as tantalite. 

The incorporation of other oxides into the pores of zeolites and related materials has been studied to a much lesser extent. Some reports have been published concerning the preparation of intrazeolitic copper oxide [112-115], cobalt oxide [116-118], nickel oxide and nickel niobate [119, 120], iron oxide [121-124], manganese oxide [118], phosphorus oxide [125,126], rhenium oxide [127], zirconium oxide [128], tin oxide [129,130] and rhodium vanadate [120, 131] clusters by impregnation methods. 

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