| 摘要 |
The present invention provides yellow inorganic pigments comprising praseodymium, oxides of transition metals selected from molybdenum, titanium, zirconium and combinations thereof, essentially molybdenum, optionally with alkaline earth metal (A) and the said yellow inorganic pigment has a general formula APr<SUB>2</SUB>MoTm<SUB>x</SUB>O<SUB>6+eta</SUB> or Pr<SUB>2</SUB>MoTm<SUB>x</SUB>O<SUB>6+eta</SUB> (Tm=Ti or Zr, x=0 or 1, and wherein eta has a value commensurate with the value of x and sufficient to satisfy the valencies of the formula). High purity chemicals such as MgCO<SUB>3</SUB>, CaCO<SUB>3</SUB>, SrCO<SUB>3</SUB>, BaCO<SUB>3</SUB>, TiO<SUB>2</SUB>, ZrO<SUB>2</SUB>, (NH<SUB>4</SUB>)<SUB>6</SUB>Mo<SUB>7</SUB>O<SUB>24</SUB>.4H<SUB>2</SUB>O and Pr<SUB>6</SUB>O<SUB>11 </SUB>are weighted in the stoichiometric ratio, ball milled and calcined in the range 900°-1200° C. for 3-12 hrs in air.
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