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gtjtp100金虫 (小有名气)
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由表3知，表中分为四组A、B、C、D分别代表陈化温度为50℃、60℃、70℃、80℃时陈化时间对碱式碳酸镁的形成与其形状影响的实验状况。（在A组中），在50℃下陈化1-15小时后生成针状白色沉淀，经XRD分析得此物质为MgCO3•3H2O。（在B组中），在60℃下陈化1-12小时后，生成的白色物质经过光学显微镜观察得知均为针状的，但是经XRD测定分析后发现，经过1-6小时陈化后形成的为MgCO3•3H2O；陈化7-12小时后形成的物质为MgCO3•3H2O与4MgCO3•Mg(OH)2•5H2O。而在60℃下陈化时间大于12小时后，生成的白色物质为针状物，经XRD测定分析后发现其为4MgCO3•Mg(OH)2•5H2O。 （在C组中），在70℃下陈化1小时后，生成物经过光学显微镜观察及XRD分析确定其为3MgCO3•3H2O；当陈化2-3小时时，生成的物质为MgCO3•3H2O和4MgCO3•Mg(OH)2•4H2O混合物，并且其晶体形态均为针状；而当陈化时间大于4小时时，生成物质为针状4MgCO3•Mg(OH)2•4H2O。 （在D组中），在80℃下陈化0.5小时后，生成的物质为球状MgCO3•3H2O；当陈化0.5-1小时后，则生成的物质为球状MgCO3•3H2O和4MgCO3•Mg(OH)2•4H2O的混合物；随着陈化时间的延长（大于1小时），生成的物质4MgCO3•Mg(OH)2•4H2O。 比较四组结果，发现随着陈化温度的升高所需要的陈化时间缩短。同时当陈化温度在70℃以下，所生成的物质均为针状，但是陈化温度升高到80℃时，所生成的物质则为球状。这是因为当温度过低时晶核的形成速度较晶粒的增长速度要快。随着温度的升高，二者增长速度均增大，但是晶粒的生长速度大于晶核的形成速率。 |
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ringzhu 
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gtjtp100(金币+1):20 2010-08-24 09:40:41
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Known from Table 3, the data is divided into four groups as A, B, C, D which represent experimental conditionsthe of the impact of aging time on formation and shape of the basic magnesium carbonate when aging temperature is 50 ℃, 60 ℃, 70 ℃, 80 ℃ (In group A), after aging for 1-15 hours at 50 ℃, needle-like white precipitation is formed and tested by the XRD analysis which indicates this as MgCO3 • 3H2O. (In group B), after aging for 1-12 hours at 60 ℃, observed by the optical microscope white matter are needle-like, but XRD analysis showed that MgCO3 • 3H2O is formed after 7-12 hours of aging ; MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 5H2O are formed after 1-6 hours of aging. and 4MgCO3 • Mg (OH) 2 • 5H2O which is white and needle-like is formed after more than 12h of aging at 60℃ according to XRD analysis。 (In group C), after aging for 1h at 70 ℃,3MgCO3 • 3H2O is formed according to optical microscope observation and XRD analysis. when aging 2-3h, the formation is the mixtrue of MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 4H2O which are both needle-like. when aging more than 4h, the 4MgCO3 • Mg (OH) 2 • 4H2O is formed. (In group D), after aging for 0.5h at 80 ℃,spherical 3MgCO3 • 3H2O is formed . when aging 0.5-1h, the formation is the mixtrue of spherical MgCO3 • 3H2O and spherical 4MgCO3 • Mg (OH) 2 • 4H2O. when aging more than 1h, the 4MgCO3 • Mg (OH) 2 • 4H2O is formed. Comparison of four groups showed that higer the aging temperature is, shorter the aging time is required . At the same time, when the aging temperature is below 70 ℃, the products are needle-like. however when the the aging temperature is more than 80 ℃, the products would be spherical. This is because when the temperature is low, the formation of nuclei is much faster than the growth of the grain. As the temperature increases, both growth rate were increased, but the growth rate is much faster than the formation of nuclei. |
4楼2010-08-22 13:51:55
gtjtp100(金币+3, 翻译EPI+1): 2010-08-21 23:21:23
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Known from the Table 3, the table is divided into four groups A, B, C, D represent the aging temperature is 50 ℃, 60 ℃, 70 ℃, 80 ℃ aging time when the basic magnesium carbonate formation on the impact of its shape experimental conditions. (In the A group), at 50 ℃ aging 1-15 hours after the needle-like white precipitation generated by the XRD analysis of this substance may MgCO3 • 3H2O. (In the B group), at 60 ℃ for 1-12 hours after the aging, white matter are generated by the optical microscope that are needle-like, but determined by the XRD analysis showed that after 1-6 hours of aging formed for MgCO3 • 3H2O; aging 7-12 hours after the formation of the material for the MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 5H2O. At 60 ℃, aging time more than 12 hours after the resulting white needle-like material substances, determined by XRD analysis and found it 4MgCO3 • Mg (OH) 2 • 5H2O. (In the C group), aging at 70 ℃ 1 hour after the resultant through optical microscope observation and XRD analysis to determine the 3MgCO3 • 3H2O; when the aging 2-3 hours, the resulting material was MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 4H2O mixture, and its crystals are needle-like shape; and when the aging time is more than 4 hours, the generation of material for the needle 4MgCO3 • Mg (OH) 2 • 4H2O. (In the D group), aging at 80 ℃, 0.5 hours, the resulting material is spherical MgCO3 • 3H2O; when the aging 0. 5-1 hours later, the resulting material is spherical MgCO3 • 3H2O and 4MgCO3 • Mg (OH) 2 • 4H2O in the mixture; with aging time (more than 1 hour), the resulting material 4MgCO3 • Mg (OH ) 2 • 4H2O. Comparison of four groups, we found that with the aging temperature, aging time required to reduce. At the same time when the aging temperature is below 70 ℃, are needle-like material generated, but the aging temperature to 80 ℃, the resulting material was spherical. This is because when the temperature is too low, the formation of nuclei than the grain growth rate faster. As the temperature increases, the growth rate were both increased, but the grain growth rate faster than the formation of nuclei. |
2楼2010-08-21 21:28:27
gtjtp100
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3楼2010-08-22 08:59:19