周晓华
,
Sфrensen O.Toft
,
曹全喜
,
徐毓龙
无机材料学报
doi:10.3321/j.issn:1000-324X.1999.06.015
本文着重讨论了掺镁SrTiO3陶瓷的电导与温度和环境氧分压之间的关系. 在SrTiO3中镁的含量分别选为10、20、30、40和50mol%,所有样品均在20～900℃的温度区间和3.8×10-4～2.6×10-1atm的氧分压范围被测试. 结果表明,所有样品均呈现p型半导体的导电特征,样品在不同温度下的R∝PO2-1/m关系中的m与镁的含量和温度有关. 根据X光衍射图和缺陷化学理论,实验结果得到适当的解释.
关键词:
钛酸锶陶瓷
,
缺陷化学
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非化学计量
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电导率
YUE Kexiang DONG Yuanchi East China Institute of Metallurgy
,
Ma'anshan
,
China
金属学报(英文版)
The equilibrium constants between Sr-O,Ba-O and Sr-S,Ba-S in liquid iron at 1570℃ and the interaction coefficients concerning these elements have been determined as follows: K_(Sro)=1.897×10~(-7),e_O~(Sr)=-43.8 K_(BaO)=8.204×10~(-8),e_O~(Ba)=-98.0 K_(SrS)=8.356×10~(-7),e_S~(Sr)=-3.9 K_(BaS)=4.083×10~(-7),e_S~(Ba)=-3.5
关键词:
equilibrium
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null
,
null
,
null
,
null
王龙妹
,
杜挺
金属学报
由低温无水电解稀土夹杂物和固体电解质定氧活度测得Ni液中Ce_2O_3,CeS及Ce_2O_2S生成反应的平衡常数,由此可得: △G°_(Ce_2O_3)=-116240+315.8 T △G°_(Ces)=-570280+220.1 T △G°_(Ce_2O_2S)=-984850+238.5 T 由实验测得数据经热力学分析计算得到1600℃Ni液中a_O-a_S平衡图,为理论上预测夹杂物生成的先后次序及类型提供了依据。
关键词:
X. He
材料科学技术（英文）
Composited nanoparticles, consisting of Mn3O4, S-doped Mn3O4 and S, were synthesized by co-precipitation reaction and Mn3O4 nanoparticles were then obtained after removing the pure S from the composited nanoparticles. The Mn3O4-type phase with larger lattice constant a was formed by doping sulfur. At fixed temperatures below Curie temperature (TC), the magnetization of the S-doped Mn3O4/S composited nanoparticles was smaller than that of the Mn3O4 nanoparticles. The blocking temperature was 36.3 and 34.8 K for S-doped Mn3O4/S composite and Mn3O4 nanoparticles, respectively. The anisotropy field of S-doped Mn3O4/S composite was determined to be about 55.3 kOe.
关键词:
Nanostructured materials
材料科学技术（英文）
Composited nanoparticles, consisting of Mn(3)O(4), S-doped Mn(3)O(4) and 5, were synthesized by co-precipitation reaction and Mn(3)O(4) nanoparticles were then obtained after removing the pure S from the composited nanoparticles. The Mn(3)O(4)-type phase with larger lattice constant a was formed by doping sulfur. At fixed temperatures below Curie temperature (T(C)), the magnetization of the S-doped Mn(3)O(4)/S composited nanoparticles was smaller than that of the Mn(3)O(4) nanoparticles. The blocking temperature was 36.3 and 34.8 K for S-doped Mn(3)O(4)/S composite and Mn(3)O(4) nanoparticles, respectively. The anisotropy field of S-doped Mn(3)O(4)/S composite was determined to be about 55.3 kOe.
关键词:
Nanostructured materials;Chemical synthesis;X-ray diffraction;Magnetic measurements;canted-spin problem;nanocrystallites
陈冬
,
韩其勇
,
王涛
,
项长祥
金属学报
本实验采用ZrO_2(MgO)固体电解质氧浓差电池直接测定氧的活度,用放射性测量技术及低温无水电解分离夹杂的方法,考察了电解分离过程中La_2O_2S的稳定性并测定了铁液中溶解态的La含量,对实验数据用平衡值外推法处理得到: 1550℃ K_(La_2O_2S)=3.81×10~(-19) e_S~(La)=-4.1 1600℃ K_(Li_2O_2S)=6.45×10~(-19) e_S~(La)=-4.8 1650℃ K_(Li_2O_2S)=7.41×10~(-19) e_S~(La)=-4.2 La_((1))=[La] △G_(sol)~0=-136700+59.82T,γ_(La)~0=0.33(1873K) 实验结果表明La具有比Ce,Nd,Y更强的脱硫氧能力。
关键词:
王龙妹
,
杜挺
金属学报
由低温无水电解稀土夹杂物和固体电解质定氧活度测得Ni液中钇的脱硫氧常数与温度的关系:lgKr_2o_2s=-(33146)/T+3.85,(1500-1600℃)钇的硫氧化物在Ni液中的标准生成自由能与温度的关系:2[Y]+2[O]+[S]=Y_2O_2S_(s),(1500—1600℃)△G°=151640+17.61T(cal/mol)=-634460+73.69T(J/mol)由实验测得数据经热力学分析计算得到1600℃Ni液中[Y]-[S]-[O]平衡立体图及α_o-α_s平衡相图,为理论上预测夹杂物生成的先后次序及类型提供了依据.并给出了Ni液中加钇控制夹杂物形态公式,钇的加入量与氧,硫含量之间的函数关系.
关键词:
王常珍
,
王福珍
,
杜英敏
,
张小平
金属学报
用直接法研究1600℃时溶铁中Ce-S-O平衡关系,测定了Ce的脱氧、脱硫、脱硫氧常数,并进行了有关的热力学探讨.由测得数据算出Ce的溶解自由能(△G_溶~0);活度系数(γ_(Ce)~0);克原子分数和百分浓度的交互作用系数ε_(Ce)~(Ce),e_(Ce)~(Ce);生成Ce_2O_2S的自由能△G_(Ce_2O_2S)~0.
关键词:
董元篪
,
韩其勇
金属学报
选用近期实验所测得的较为准确的RE-O,RE-S和RE-O-S系统的热力学数据,建立了纯铁液中的[Ce]-[O]-[S]空间沉淀图。应用热力学理论计算了铁液中氧硫活度和所生成的稀土夹杂物之间的定量关系。又以实验事实为依据,确定铁水初始氧硫活度和所生成稀土夹杂物类型的关系,并且验证了理论计算的结果。
关键词:
孙中强
,
车荫昌
,
姜茂发
,
梁连科
钢铁研究学报
为了确定钢液炉外精炼过程中加入钙使Al2O3夹杂物变性或与硫生成CaS的条件,通过热力学计算得出了1 600 ℃和1 550 ℃时Fe-Al-Ca-O-S系的平衡图.在CaO-Al2O3熔体组成,钢液中铝、硫和氧的活度以及钙的蒸气分压这5个变量中,只需知道其中两个变量,由此图就可直接查出与之平衡的其余3个变量.
关键词:
平衡图
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夹杂物变性
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脱硫
,
钢液
,
炉外精炼
