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PHASE EVOLUTION AND MICROWAVE DIELECTRIC PROPERTIES OF (Li0.5Bi0.5)(W1-xMox)O-4 (0.0 &= x &= 1.0) CERAMICS WITH ULTRA-LOW SINTERING TEMPERATURES
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The　(Li0.5Bi0.5)(W1-xMox)O-4&#1　＜=　x　＜=&#)　ceramics　were　prepared　via　the　solid　state　reaction　method.　The　sintering　temperature　decreased　almost　linearly　from&#　degrees　C　for　(Li0.5Bi0.5)WO4　to&#　degrees　C　for　(Li0.5Bi0.5)MoO4.　When　the　x　＜=&#,　a　wolframite　solid　solution　can　be　formed.　For　x　=&#　and　x　=&#　compositions,　both　the　wolframite　and　scheelite　phases　can　be　formed　from　the　X-ray　diffraction　analysis,　while　two　different　kinds　of　grains　can　be　revealed　from　the　scanning　electron　microscopy　and　energy-dispersive　X-ray　spectrometer　results.　High　performance　of　microwave　dielectric　properties　were　obtained　in　the　(Li0.5Bi0.5)-(W0.6Mo0.4)O-4　ceramic　sintered　at&#　degrees　C　with　a　relative　permittivity　of&#,　a　Qf　value　of&#　GHz　(at&#　GHz),　and　a　temperature　coefficient　value　of　+20ppm/degrees　C.　Complex　dielectric　spectra　of　pure　(Li0.5Bi0.5)WO4　ceramic　gained　from　the　infrared　spectra　were　extrapolated　down　to　microwave　range,　and　they　were　in　good　agreement　with　the　measured　values.　The　(Li0.5Bi0.5)-(W1-xMox)O-4&#1　＜=　x　＜=&#)　ceramics　might　be　promising　for　low　temperature　co-fired　ceramic　technology.
[Zhou, Di; Guo, J Yao, Xi] Xi An Jiao Tong Univ, Minist Educ, Key Lab, Elect Mat Res Lab, Xian 710049, Shaanxi, Peoples R China
[Zhou, Di; Guo, J Yao, Xi] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Shaanxi, Peoples R China
[Pang, Li-Xia] Xian Technol Univ, Microoptoelect Syst Labs, Xian 710032, Shaanxi, Peoples R China
[Qi, Ze-M Shao, Tao] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China
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解：∵当x＜0时，y随x的增大而减小，& & ∴-2m+5＞0，& & ∴m＜5/2 ，& 又∵m是正整数，& & ∴m=1、2，
&&&&，V2.18449已知A={x/0
sbqhxie177
A＝｛x｜1＆lt；｜x－2｜＆lt；2｝＝｛x｜1＆lt；x－2＆lt；2,或－2＆lt；x－2＆lt；－1｝＝｛x｜3＆lt；x＆lt；4,或0＆lt；x＆lt；1｝B＝｛x｜x＆＃178；－（a＋1）x＋a＆lt；0｝＝｛x｜（x－1）（x－a）＆lt；0｝A∩B≠＆＃8709；当a＆gt；1时,B＝｛x｜1＆lt；x＆lt；a｝2那么a＆gt；3；当a＝1时,B＝＆＃8709；,不合题意,舍去；当a＆lt；1时,B＝｛x｜a＆lt；x＆lt；1｝,那么a＆lt；0综上,a＆lt；0,或a＆gt；3
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