The preparation of ultra fine Y A G( Y3 Al5 O12) po w der through co precipitation techniquew as investigated . The for m ation tem perature of Y A G w as lo wered belo w 800 ℃ by carefullycontrolling process...The preparation of ultra fine Y A G( Y3 Al5 O12) po w der through co precipitation techniquew as investigated . The for m ation tem perature of Y A G w as lo wered belo w 800 ℃ by carefullycontrolling process para m eters . Ultra fine Y A G po w der w ith even size distribution , spheri cal shapes , and 40 n m particle size has been produced . It is found that for m ation of Y A Gisnot through the Y A M an d Y A Pinter mediate phases that are often observed during the synthe sis of Y A G by m ixed oxide m ethod . The sm all particle size of the precursor po w der , them olecular scale mixing of the constituents , and the poly m orphic transfor m ation of Al2 O3during heating accou nt m ainly for the reduction of for m ation tem perature of Y A Gan d the e lim ination of inter m ediate Y A M and Y A Pphases .展开更多
Starting from cheap inorganic salts , ultrafine P L Z T po w ders were synthesized by a co pre cipitation m ethod . The results show that the precursor precipitate obtained by the co precipita tion method transf...Starting from cheap inorganic salts , ultrafine P L Z T po w ders were synthesized by a co pre cipitation m ethod . The results show that the precursor precipitate obtained by the co precipita tion method transfor ms co m pletely to P L Z T phase by calcining at 420 ℃ for 4 hours , about300 ℃low er than the nor m al transform ation te m perature of P L Z T obtained by m ixed oxidemethod . The effect of residual N H4 N O3 in the precursor precipitate on transfor m ation te m perature of the P L Z Tpow der w as investigated . The residual N H4 N O3 in the precursor po w der can reduce further the P L Z Ttransfor m ation tem perature to about 300 ℃, but a sm alla mount of Zr O2 and Pb Ti O3 re m ained . By a proper control of the synthesizing route , a P L Z T po w der with a pri m ary particle size of 10 n m and an agglom eration size of 0 3 μm hasbeen produced .展开更多
文摘The preparation of ultra fine Y A G( Y3 Al5 O12) po w der through co precipitation techniquew as investigated . The for m ation tem perature of Y A G w as lo wered belo w 800 ℃ by carefullycontrolling process para m eters . Ultra fine Y A G po w der w ith even size distribution , spheri cal shapes , and 40 n m particle size has been produced . It is found that for m ation of Y A Gisnot through the Y A M an d Y A Pinter mediate phases that are often observed during the synthe sis of Y A G by m ixed oxide m ethod . The sm all particle size of the precursor po w der , them olecular scale mixing of the constituents , and the poly m orphic transfor m ation of Al2 O3during heating accou nt m ainly for the reduction of for m ation tem perature of Y A Gan d the e lim ination of inter m ediate Y A M and Y A Pphases .
文摘Starting from cheap inorganic salts , ultrafine P L Z T po w ders were synthesized by a co pre cipitation m ethod . The results show that the precursor precipitate obtained by the co precipita tion method transfor ms co m pletely to P L Z T phase by calcining at 420 ℃ for 4 hours , about300 ℃low er than the nor m al transform ation te m perature of P L Z T obtained by m ixed oxidemethod . The effect of residual N H4 N O3 in the precursor precipitate on transfor m ation te m perature of the P L Z Tpow der w as investigated . The residual N H4 N O3 in the precursor po w der can reduce further the P L Z Ttransfor m ation tem perature to about 300 ℃, but a sm alla mount of Zr O2 and Pb Ti O3 re m ained . By a proper control of the synthesizing route , a P L Z T po w der with a pri m ary particle size of 10 n m and an agglom eration size of 0 3 μm hasbeen produced .
