Vol.28 No.8 秦红霞等：常温下固体颗粒层过滤除尘技术 ·773。 velocity on the dust removal efficiency was researched.The result gave the optimal filter particle diameter, layer thickness and filtration velocity. KEY WORDS dust removal;granular layer;dust removal efficiency;pressure difference Phase diagrams of Li2Mo04-Na2M004 and Na2M004-K2M004 systems DING Yimin2).HOU Na,CHEN Nianyi,XIA Yiben2) 1)Collge of Sciences Shanghai University,Shanghai 200444.China 2)School of Materials Science and Engineering.Sharghai University.Sharghai 200072.China ABSTRACT The phase diag rams of the Li2Mo04-NaMo04 and NaMo04-K2Mo04 systems have been re- assessed using differential thermal analysis together with high-temperature and room-temperature X-ray diffraction analy sis.The results showed that the compound Li2Mo04'6NaMo04 did not exist;however,it confirmed the existence of the compound Li2Mo04'3NaMo04in the Li2Mo04-NaM004 sy stems.With re- gard to the system of Na2Mo04-K2Mo04,we could not confirm the results reported by Bukhanova who claimed that the system was eutectic type with 1I and 1:2 intermediate compounds,refuting the state- ment of Amadori w ho thought there w as an apparent phase boundary at high temperature in a-solid solut ion region of the NaMo04-K2Mo04 binary system.The revised phase diagrams of these systems are illustrated in this article.These experimental results are in agreement with the computerized prediction using the sup- port vector machine-atomic parameter method for the assessment of phase diag rams. KEY WORDS phase diagram;DTA;Li2M 004;NaMo04;K2Mo04 【摘自Rare Metals,2006,25(4):316] Effects of PSMA and experimental conditions on the morphologies of BaCO3 w hiskers CHENG Bei,YU Xiaoxiao,YUJiaguo,ZHAO Xiujian State Key Laboratory of Advanced Techmlogy for Material Synthesis and Pmcessing,Wuhan University of Techmlogy.Wuhan 430070.China ABSTRACT BaCO3 whiskers exhibiting different morphologies were fabricated by a simple precipitat ion reaction of barium chloride with sodium carbonate in the absence and presence of poly-(sty rene-alt-maleic acid)(PSMA)as a crystal growth modifier at room temperature.The as-prepared products were character- ized by scanning electron microscopy (SEM),transmission electron microscopy (TEM),and X-ray diffrac- tion (XRD).The influences of experimental parameters on the size and morphology of BaCO3 whiskers were investigated and discussed.It was found that the as-prepared BaCO3 whiskers are single crystals with diameter ranging from 100 to 300nm,and grow along the crystallographic a-axis or [100]direction.Ba- CO3 whiskers with different morphologies such as branching and dendritic structure,can be obtained de- pending on the experimental conditions.With increasing PSMA concentration,the diameter of BaCO3 whiskers decreases. KEY WORDS BaCO3 whiskers;morphological control;poly-(sty rene-alt-maleic acid);single crystal 【摘自Rare Metals,2006,25(4):382]velocity on the dust removal efficiency was researched .The result gave the optimal filter particle diameter, layer thickness and filtration velocity . KEY WORDS dust removal ;granular lay er ;dust removal efficiency ;pressure difference Phase diagrams of Li2MoO4-Na2MoO4 and Na2MoO4-K2MoO4 systems DING Y imin 1, 2), HOU Na 1), CHEN Nianyi 1), XIA Y iben 2) 1)College of Sciences, Shanghai University , Shanghai 200444 , C hina 2)School of Mat erials Science and Engineering , Shanghai University , Shanghai 200072 , China ABSTRACT The phase diag rams of the Li2MoO4-Na2MoO4 and Na2MoO4-K2MoO4 systems have been re￾assessed using differential thermal analysis together with high-temperature and room-temperature X-ray diffraction analy sis .The results showed that the compound Li2MoO4·6Na2M oO4 did not exist ;however , it confirmed the existence of the compound Li2MoO4·3Na2MoO4 in the Li2MoO4-Na2M oO4 sy stems .With re￾g ard to the sy stem of Na2MoO4-K2MoO4 , w e could not confirm the results repo rted by Bukhanova who claimed that the system w as eutectic type with 1∶1 and 1∶2 intermediate compounds, refuting the state￾ment of Amado ri w ho thought there w as an apparent phase boundary at high temperature in α-solid solution region of the Na2M oO4-K2MoO4 binary system .The revised phase diag rams of these systems are illustrated in this article .These experimental results are in ag reement with the computerized prediction using the sup￾po rt vector machine-atomic parameter method for the assessment of phase diag rams . KEY WORDS phase diagram ;DTA ;Li2M oO4 ;Na2MoO4 ;K2MoO4 [ 摘自 Rare Metals, 2006 , 25(4):316] Effects of PSMA and experimental conditions on the morphologies of BaCO3 w hiskers CHENG Bei , YU Xiaoxiao , Y U J iaguo , ZHAO Xiujian S tate Key Laboratory of Advanced Tech nology f or Mat erial Synthesis and Processing , Wuhan University of Tech nology , Wuhan 430070 , China ABSTRACT BaCO3 w hiskers exhibiting different morphologies were fabricated by a simple precipitation reaction of barium chloride w ith sodium carbonate in the absence and presence of poly-(sty rene-alt-maleic acid)(PSMA)as a crystal grow th modifier at room temperature .The as-prepared products w ere character￾ized by scanning electron microscopy (SEM), transmission electro n microscopy (TEM), and X-ray diffrac￾tion (XRD).The influences of experimental parameters on the size and morphology of BaCO3 w hiskers w ere investigated and discussed .It w as found that the as-prepared BaCO3 whiskers are sing le crystals w ith diameter ranging from 100 to 300 nm , and grow along the crystallographic a-axis or [ 100] direction .Ba￾CO3 whiskers with different mo rphologies, such as branching and dendritic structure , can be obtained de￾pending on the experimental conditions .With increasing PSMA concentration , the diameter of BaCO3 w hiskers decreases . KEY WORDS BaCO3 w hiskers ;morphological control ;poly-(sty rene-alt-maleic acid);single crystal [ 摘自 Rare Metals, 2006 , 25(4):382] Vol.28 No.8 秦红霞等:常温下固体颗粒层过滤除尘技术 · 773 ·