Mg2MM'o 6+x, (M=Y, rare earth metal and M'=SN, OR Zr)...

Details Mg2MM'o 6+x, (M=Y, rare earth metal and M'=SN, OR Zr)... Mg2MM'o 6+x, (M=Y, rare earth metal and M'=SN, OR Zr)...

2008-03-25

2008-03-25

Vanoy, Timothy C. (Department: 1793)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S155000, C423S021100, C423S608000, C423S617000, C423S635000, C423S089000, C423S087000, C423S069000, C423S062000, C423S618000, C423S594170, C423S263000, C423S593100, C423S594160, C501S135000

Reexamination Certificate

active

07347983

ABSTRACT:
Complex ceramic oxides of the general formula Mg2MM′O6+xwhere M=Rare metal ion or Yttrium or Lanthanum and M′=Sn, Sb, Zr, Hf, Ta, and Nb; and where −0.5<x<0.5; having a defective pyrochlore structure are useful for active and passive electronic applications, as dielectrics, catalyst sensors, hosts for radioactive waste, etc. This process for the preparation of this class of compounds comprises: (i) mixing the compounds of magnesium, M and M′ to get the molar ratio as 2:1:1 (ii) the mixture obtained in step (i) along with a wetting medium may be ball milled or mixed; (iii) the resultant slurry may be dried to obtain dry powder, (iv) the resultant mixture may be heated to a temperature in the range of 1000-1600° C. for the duration ranging from 3 hours to 50 hours, either in a single step or by taking out the reactant after heating, checking for the structure formation and heating again after grinding, if necessary.

REFERENCES:
patent: 4054532 (1977-10-01), Hanke et al.
patent: 5015461 (1991-05-01), Jacobson et al.
patent: 5993947 (1999-11-01), Cava et al.
patent: 6761866 (2004-07-01), James et al.
patent: 6835367 (2004-12-01), James et al.
The English abstract of the article titled “Compound Mg2Ta2O7 and its interaction with Nd3TaO7” published in “Refractories and Industrial Ceramics” (2002), 43(5-6), pp. 172-175.
Koshy et al., “Novel Ceramic Substrates for High Tc Superconductors”,Bull Mater., Sci., vol. 22, No. 3, pp. 243-249, (May 1999).
Koteswara Rao et al., “Preparation and Characterization of Bulk and Nano Particles of La2Zr2O2and Nd2Zr2O2by Sol-Gel Method,”Materials Letters, 54, pp. 205-210, (2002).
X.L. Li et al., “Synthesis, Crystal Structure, and Magnetic Property of Sm2−xCoxTi2−xNBxO7(x=0, 0.2, 0.4)”,Materials Chemistry&Physics, 77, pp. 625-631, (2002).
S. Ya Istomin et al., “Synthesis & Characterization of Reduced Niobates . . . ”,Materials Research Bulletin, vol. 32, No. 4, pp. 421-430, (1997).
Holtappels et al., “Electrical Conductivities and Chemical Stabilities of Mixed Conducting Pyrochlores for SOFC Applications”,Solid State Ionics, vol. 135, pp. 675-679, (2000).
Zhigang Zou et al., “Preparation, Structural & Optical Properties of a New Class of Compounds”, Bi2MNbO7(M=Al, Ga, In), Materials Science & Engineering B79, pp. 83-85, (2001).
M. Valant, “Synthesis & Dielectric Properties of Pyrochlore Solid Solutions in the Bi2O3-Zno-Nb2O5-TiO2System”,Journal of Materials Science, 34, pp. 5437-5442 (1999).
Michael M.A. Sekar, “Low Temperature Synthesis & Properties of Microwave Resonator Materials”,Materials Science&Engineering B38, pp. 273-279, (1996).

Affiliated with

Also associated with

Rating

Mg2MM'o 6+x, (M=Y, rare earth metal and M'=SN, OR Zr)... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Mg2MM'o 6+x, (M=Y, rare earth metal and M'=SN, OR Zr)..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mg2MM'o 6+x, (M=Y, rare earth metal and M'=SN, OR Zr)... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2791491