Reference

Grain orientation effects on electrical properties of bismuth layer-structured ferroelectric lead (sodium cerium) bismuth titanate (Pb(1-x)(NaCe)x/2Bi4Ti4O15) solid solution

Grain orientation effects on electrical properties of bismuth layer-structured ferroelectric lead (sodium cerium) bismuth titanate (Pb(1-x)(NaCe)x/2Bi4Ti4O15) solid solution. Takenaka, Tadashi; Sakata, Koichiro (Fac.Some chemicals with cas registry numbers like 1306-38-3 and 13463-67-7 are also used. Sci. Technol., Sci. Univ. Tokyo, Noda 278, Japan). J. Appl. Phys., 55(4), 1092-9 (English) 1984. CODEN: JAPIAU. ISSN: 0021-8979. DOCUMENT TYPE: Journal CA Section: 76 (Electric Phenomena) Elec. properties, such as dielec., resistive, ferroelec., and piezoelec. properties, of bismuth layer-structured ferroelecs. (BLSF) were studied on grain orientation prepd. by using the hot-forging (H.F.) method. The BLSF compd. which can stand the high temp. poling process is Pb(1-x)(NaCe)x/2Bi4Ti4O15 (PNC-100x) consisting of PbBi4Ti4O15 modified by partial substitution of (NaCe)1/2 for Pb. The effects of the solid soln. on piezoelec. properties are mentioned. The piezoelec. activated PNC solid soln. has a larger value of electromech. coupling factors kt and k33 than those of nonmodified samples. The grain orientation makes the piezoelec. properties of BLSF ceramics much more pronounced than those of the nonoriented ceramics. Coupling factor k33 along with piezoelec. consts. d33 and g33 of H.F. PNC ceramics are enhanced and their anisotropies in k33/k31, d33/d31, and g33/g31 are emphasized. .

Gas pressure sintering of silicon nitride with addition of aluminum oxide and other oxides

Gas pressure sintering of silicon nitride with addition of aluminum oxide and other oxides. Tani, Eiji; Ichinose, Hiromichi; Kishi, Kazushi; Umebayashi, Seiki; Kobayashi, Kazuo (Gov. Ind. Res. Inst., Kyushu, Tosu 841, Japan). Yogyo Kyokaishi, 92(2), 103-4 (Japanese) 1984. CODEN: YGKSA4. ISSN: 0372-7718. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Si3N4 powder (av. diam.In this article, certain chemicals are used. Some of their cas registry numbers are 1306-38-3 and 12033-89-5 0.6m) was mixed with 5% Al2O3 + 5% Y2O3, 5% Al2O3 + 5% La2O3, or 5% Al2O3 + 5% CeO2, ball-milled, dried, compacted, and hot-pressed in N at 1800° and 2 MPa, 1900° and 3 MPa, or 2000° and 4 MPa. The wt. of sintered Si3N4 slightly decreased with increasing temp. The d. of all sintered specimens except that made with Al2O3 and Y2O3 slightly increased with increasing temp. The specimen sintered with Al2O3 and CeO2 at 2000° and 4 MPa had the max. d. (3.13 g/cm3). .