REPORT DOCUMENTAT1IN PAGE; dw *- I I Oe 1 ft Q7 Utia 1o-)pVWyWQ Ultran'low ceramics OTIC FILE Cb YAFOSR- 8 3-02 9 1

Purther exploration in the NZP]-family was carried on-in that the systematic crystal chemistry investigation of MZr2 P3O 2 (M1- Li,Na,K,Rb and Cs) and MllZr4 P6 02 4 (M 11- Mg, Ca,Sr,Ba) was completed and?ew more new-compositions were synthesized and characterized. An etfurt was made to grow single crystals of Na, Sr and Ca zirconium phosphates using B2 03 as flux in order to obtain more data to confirm the results obtained on powdered samples. NaGe2P3 012 was studied as a potential candidate for the development of glass-ceramic due to its low melting behavior. It has been established that sol-gel process is superior to powder method for synthesizing [NZP].-compounds and therefore most of the compositions were prepared by this route. Dielectric measurements made on CaZr4P6 024 showe, that in general, [NZP]-materials have low dielectric constant with relatively low loss. New families such as diborides and Al2 0j-GeO2 were investigated for their thermdl expansion behavior. Pb3MgNb209 and related perovskites were also inVestigated in order to search any new low thermal expansion composition with high dielectr~c cosatu ofar D. T Ar 1 f1 djstit, I,) ' unj:,iti.