Synthesis and magnetic properties of novel Ln[subscript 2-x]MxCuO[subscript 4+y] compositions (Ln = La,Pr,Nd,Sm,Eu,Gd; M = Ca,Sr,Ba; 0<=x<=0.2; -0.5<=y<=0.5)

Abstract

Synthesis and magnetic properties of novel Ln[subscript 2-x]MxCuO[subscript 4+y] compositions (Ln = La,Pr,Nd,Sm,Eu,Gd; M = Ca,Sr,Ba; 0<=x<=0.2; -0.5<=y<=0.5) " (1992). Retrospective Theses and Dissertations. 9824. https://lib.dr.iastate.edu/rtd/9824 INFORMATION TO USERSThis manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the qualify of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand corner and continuing from left to right m equal sections with small overlaps. Each original is also photographed in one exposure and is included in reduced form at the back of the book. Synthesis and magnetic properties of novel Ln2-.xMxCuO/!^^y compositions {Ln -La^ Pr, Nd, Sm, Eu, Gd\ M = Ca, Sr, Ba\ 0 < x < 0,2; -0.5 < y < 0.5) Oversize materials

Microstructures and Microwave Dielectric Properties of the CaSmAlO4‐Based Ceramics

“…R ECENTLY, microwave dielectric ceramics with the chemical formula MRAlO 4 (M 5 Ca and Sr; R 5 Y, La, Nd, and Sm) and with K 2 NiF 4 structure have been proposed and investigated for microwave applications, [1][2][3] because of the excellent dielectric characteristics of their single crystals. 4 The temperature-stable dielectric constants of 18-19 combined with high Q Â f values (B55000 GHz) were obtained in the present systems at 10 GHz.…”

“…4 The temperature-stable dielectric constants of 18-19 combined with high Q Â f values (B55000 GHz) were obtained in the present systems at 10 GHz. 1,3 Considering the developing trend of cost efficiency in microwave dielectric ceramics, 5,6 MRAlO 4 ceramics without noble elements such as Ta and Nb are expected to be very competitive ultra-low loss microwave materials compared with previous materials such as Ba(Mg 1/3 Ta 2/3 )O 3 , 7 Ba(Zn 1/3 Ta 2/ 3 )O 3 , 8 and Ba(Zn 1/3 Nb 2/3 )O 3 . 9 Like MgTiO 3 -based ceramics, 10,11 the primary issue for MRAlO 4 microwave dielectric ceramics is to further improve their microwave dielectric properties.…”