1) deta-sigma
Δ-∑
2) oxygen-deficient nickel ferrite
NiFe2O4-δ
1.
5 g,the optimum reduction condition for the preparation of oxygen-deficient nickel ferrite,NiFe2O4-δ,reduced by H2 was as follows: reduction temperature was 320 ℃,H2 flow rate was 40 mL/min and reduction time was 3 h.
采用柠檬酸络合法制备NiFe2O4,运用XRD、DTA-TG等手段对其结构进行表征,并探讨还原条件对NiFe2O4-δ的结构稳定性及其催化分解CO2成C反应活性的影响。
3) δ phase
δ相
1.
The precipitation behavior of δ phase, γ ′′ and γ ′ phase was studied through adjusting precipitated strengthening elements Al, Ti and solution strengthening element W in 718 alloy.
通过对718合金中沉淀强化元素Al,Ti以及固溶强化元素W含量的调整,研究了δ相形成规律及合金中γ′′/γ′复合析出组织的形成条件,同时分析了合金的微观组织与力学性能之间的关系。
2.
It is shown that the addition of Ti and Al can evidently decrease the oxidation rates of alloy,and both Nb-15Ti-11Al and Nb-30Ti-15Al(β+δ) show superior oxidation resistance than Nb-35Ti-6Al(β) which may be attributed to the decreased solubility and diffusion of oxygen in δ phase.
研究表明,元素Ti和Al的加入能有效改善合金的抗氧化性能,合金中δ相的存在降低了氧的溶解度,同时抑制氧的扩散,因而两相合金Nb-15Ti-11Al和Nb-30Ti-15Al(β+δ相)抗氧化性能优于单相合金Nb-35Ti-6Al(β相)。
4) La_(0.8)Sr_(0.2)MnO_(3-δ)
La0.8Sr0.2MnO3-δ
5) δ' phase
δ'相
1.
A small angle X-ray scattering (SAXS) technique was used to characterize the interfaces between the δ′ phase and matrix in 2091 Al-Li alloy aged at 150 ℃ for different times.
采用小角X射线散射技术对2091Al-Li合金时效过程中δ′相的生长机制和相界特性进行了研究。
2.
The formation and the coarse of δ′ phase in 1420 Al-Li alloy treated by retrogression and reaging were investigated by means of small angle X-ray scattering (SAXS) technique.
采用小角 X射线散射技术研究了回归再回火处理 1 42 0铝锂合金 δ′相的形成和粗化 。
3.
Small angle X ray scattering (SAXS) technique was used to research the interfacial characteristic between δ′ phase and matrix in 8090 Al Li alloy aged at 160 ℃ for several times.
采用小角Ｘ射线散射技术研究８０９０Ａｌ－Ｌｉ合金回火析出δ′相的相界特征。
6) Ce_(0.8)Gd_(0.2)O_(2-δ)
Ce0.8Gd0.2O2-δ
补充资料：∑
∑,sigma,希腊字母（念：西格玛） 表示数学中的“求和”，比如：
∑pi，i为1,2,...,t，
即为求p1 + p2 + ... + pt的和。
sigma（大写σ，小写σ），是第十八个希腊字母。 在希腊语中，若果一个单字的最末一个字母是小写sigma，要把该字母写成 ς，此字母又称final sigma（unicode: u+03c2）。在现代的希腊数字代表6。
大写σ用于：
数学上的总和符号
小写σ用于：
统计学上的标准差
西里尔字母的с及拉丁字母的s都是由sigma演变而成。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条