An all solid battery includes: a solid electrolyte layer including phosphoric acid salt-based solid electrolyte; a first electrode that is formed on a first main face of the solid electrolyte layer; and a second electrode that is formed on a second main face of the solid electrolyte layer, wherein a D50% grain diameter of crystal grains of the phosphoric acid salt-based solid electrolyte is 0.5 m or less, wherein a D90% grain diameter of the crystal grains is 3 m or less.

According to the present invention, provided is a carbonate- and magnesium-substituted hydroxyapatite having a particle size of 5 nm or more and 60 nm or less, wherein a portion of the calcium atoms in the hydroxyapatite are substituted with magnesium atoms and a portion of phosphate groups are substituted with carbonate groups.

According to the present invention, provided is a carbonate- and magnesium-substituted hydroxyapatite having a particle size of 5 nm or more and 60 nm or less, wherein a portion of the calcium atoms in the hydroxyapatite are substituted with magnesium atoms and a portion of phosphate groups are substituted with carbonate groups.

There is provided a solid electrolyte including at least one layer with no nitrogen and which includes Li.sub.xPO.sub.yS.sub.z, with 0<z3, 2.1x2.4, and 1y4. A battery including the electrolyte, and a method for producing the electrolyte, are also provided.

There is provided a solid electrolyte including at least one layer with no nitrogen and which includes Li.sub.xPO.sub.yS.sub.z, with 0<z3, 2.1x2.4, and 1y4. A battery including the electrolyte, and a method for producing the electrolyte, are also provided.

A compound represented by the general formula Li(Ti.sub.1-xZr.sub.x).sub.2(PS.sub.4).sub.3, wherein 0.01x0.25, and found to have high ionic conductivity; a use of the compound as a solid electrolyte, in particular in an all solid-state lithium battery.

A compound represented by the general formula Li.sub.1+xAl.sub.xTi.sub.2-x(PS.sub.4).sub.3, wherein 0.1x0.75. The above compound has been found to have high ionic conductivity. Also, the use of the compound as a solid electrolyte, in particular in an all solid-state lithium battery.

A preparation method of phosphotungstic acid includes mixing a mixed solution containing tungsten, phosphorus and an inorganic acid with an organic-alcohol-containing oil phase for extraction, stripping the obtained supported organic phase and distilled water according to an oil phase:aqueous phase volume ratio of 3:1 to 10:1 to obtain a stripping solution; and carrying out thermal evaporation crystallization or spray drying on the stripping solution to obtain a phosphotungstic acid crystal, wherein the organic alcohol is a C7-C20 alcohol. The inventors have found out that the addition of an inorganic acid to a solution of phosphorus or tungsten and the use of an organic alcohol as an extractant can achieve simultaneous and efficient extraction of phosphotungstic acid. It has also been found that the organic-alcohol-containing oil phase has excellent selectivity for phosphotungstic acid molecules in the mixed solution.

A carbonate apatite prepared from natural bone. The carbonate apatite has a protein content of 2000-8000 parts per million and a surface area of 15 to 70 m.sup.2/g. Also provided is a method for preparing the carbonate apatite from cancellous bone particles.

A carbonate apatite prepared from natural bone. The carbonate apatite has a protein content of 2000-8000 parts per million and a surface area of 15 to 70 m.sup.2/g. Also provided is a method for preparing the carbonate apatite from cancellous bone particles.