K_（2x）M_（1－x）Zr_4（PO_4）_6（M＝Sr，Ba）系统的热学和

用固相反应法合成了Ｋ２ｘＭ１－ｘＺｒ４（ＰＯ４）６（Ｍ＝Ｓｒ，Ｂａ）固溶体。用逐步推进的最小二乘法对固溶体各组成的高温Ｘ射线衍射线条进行指标化，精确计算了晶格常数目温度的变化，并由此计算轴向膨胀系数αａ和αｃ，所得结果和用顶杆法测定的热膨胀系数相吻合。用复数阻抗谱法测定了固溶体的电导率随温度及组成的变化。     

K2xM1—xZr4（PO4）6（M=Sr,Ba）系统的热学和电学性能

用固相反应法合成了Ｋ２ｘＭ１－ｘＺｒ４（ＰＯ４）６（Ｍ＝＝Ｓｒ，Ｂａ）固溶体。用逐步推最小二乘法对固溶体各组成的高温Ｘ射线线条进行指化，精确计算了晶格常数随温度的变化，并由此计算轴向膨胀系数ａａ和ａｃ，所得结果和用顶杆法测定的热膨胀系数相吻合。用复数阻抗谱法测定了固溶体的电导率随温度及组成的变化。     

Ca0.6Mg0.4Zr4（PO4）6陶瓷的抗热震性

Ｃａ０．６Ｍｇ０．４Ｚｒ４（ＰＯ４）６（简称ＣＭ）陶瓷热震后的强度变化与裂纹扩展依赖于材料的热膨胀系数和轴向膨胀特性。以ＭｇＯ作为烧结助剂的ＣＭ１陶瓷，当热震温差ΔＴ＝８００℃时，残留强度与原始强度相关。作者提出裂纹部分闭合模式解释了上述现象。以ＺｎＯ作烧结助剂的ＣＭ２陶瓷，其强度降低和裂纹扩展符合Ｈａｓｓｅｌｍａｎ提出的脆性陶瓷热震理论。     

分光光度法用于工业水中SO_4~（2－）的测定

分光光度法用于工业水中ＳＯ_４~（２－）的测定１原理在酸性条件下，ＢａＣｒＯ４与ＳＯ反应，生成ＢａＳＯ４沉淀和ＣｒＯ，ＣｒＯ为带色酸根，因而其消光值的大小间接反应映出ＳＯ含量的高低。２试剂与仪器（１）ＢａＣｒＯ４悬浮液：取１ｇ精制后的ＢａＣｒＯ４溶于１...     

Ca8M（SiO4）4Cl2（M=Mg,Zn）中Ce^3＋的发光性质

报道了氯硅酸镁钙Ｃａ８Ｍｇ（ＳｉＯ４）４Ｃｌ２及氯硅酸锌钙Ｃａ８Ｚｎ（ＳｉＯ４）４Ｃｌ２中Ｃｅ＾３＋的发光特性，研究并分析了Ｃｅ＾３＋在这两种材料中的激发光谱，发射光谱及荧光衰减特性，在ＵＶ辐射激发下，Ｃｅ＾３＋发射出强的蓝紫光。室温下Ｃｅ＾３＋在两种材料中的荧光寿命分别为６１ｎｓ和４４ｎｓ。     

盐水精制过程中SO_4~（2－）消除方法的探讨

盐水精制过程中ＳＯ＿４￣（２－）消除方法的探讨日前，国内各大氯碱厂多采用ＢａＣｌ＿２法去除盐水中ＳＯ＿４￣（２－），而国外一些发达国家采用钙法较多。ＢａＣｌ＿２法是利用ＢａＳＯ＿４溶度积小、反应快的特点，去除ＳＯ＿４￣（２－）较彻底，但ＢａＣｌ＿２价...     

CZP基新型膨胀可调陶瓷材料的研究

首次以矿物原料磷灰石和锆英石粉为主，添加活性ＺＰ粉制各了一种以Ｃａ０．５Ｚｒ（ＰＯ４）３（ＣＺＰ）为主晶相的膨胀可调陶瓷材料。研究结果表明，随着ＺＰ粉含量的增加，ＣＺＰ晶相含量增加，抗弯强度和热膨胀系数减少。调整组成，可以将该材料的膨胀系数从很大的正值变化至负值。     

掺Nd~（3＋）的［Y（Ca）］_3［Al（Zr）］_5O_（12）石榴石单晶

用激光加热基座法（ＬＨＰＧ）从粉末直接生长单晶光纤并对其光谱作了研究。结果表明：ＬＨＰＧ法生长出来的单晶光纤可替代大块晶体去研究光谱等性能；Ｃａ￣（２＋）和Ｚｒ￣（４＋）等量同时掺入到Ｎｄ：ＹＡＧ晶体中，其吸收谱与Ｎｄ：ＹＡＧ基本相同，但荧光分支比和荧光衰减规律发生显著变化。此外还探讨了Ｃａ￣（２＋），Ｚｒ￣（４＋）影响的原因。     

CaSO4—H3PO4—H2SO4—H2O四元系统及其应用（下）

ＣａＳＯ４－Ｈ３ＰＯ４－Ｈ２ＳＯ４－Ｈ２Ｏ四元系统及其应用（下）吴佩芝（上海天山路４６８弄９号３０４室２０００５１）中图分类号ＴＱ１２６．３５３四元系统在二水物流程中的应用〔１〕ＣａＳＯ４－Ｈ３ＰＯ４－Ｈ２Ｏ三元系统研究的结果指出：形成二水物硫酸钙的...     

Pr~（3＋）掺杂的Cd_3M_2Ge_3O_（12）（M＝Al，Ga）石榴石

首次报道Ｐｒ￣（３＋）分别激活的Ｃｄ＿３Ａｌ＿２Ｇｅ＿３Ｏ＿（１２）（ＣＡＧＧ）和Ｃｄ＿３Ｇａ＿２Ｇｇｅ＿３Ｏ＿（１２）（ＣＧＧＧ）锗酸盐石榴石的阴极射线发光光谱，Ｐｒ￣（３＋）的４ｆ能级发射强度与ｐｒ￣（３＋）浓度关系以及粉红色较长余辉特性。与ＣＡＧＧ相比，发现在ＣＧＧＧ中Ｐｒ￣（３＋）的所有４ｆ－４ｆ跃迁发射峰位置向短波移动，并分析造成这种光谱“蓝移”的原因。     

添加剂对NZP族低热膨胀陶瓷热学性质的影响

以NZP族低热膨胀陶瓷Ca1-xBaxZr4(PO4)6(0≤x≤1)系列中的零膨胀组成Ca0.85Ba0.15Zr4P6O24为例,着重研究了不同添加剂对该零膨胀陶瓷的热膨胀异向性、平均热膨胀系数和导热性能的影响规律。实验结果表明,在烧结过程中添加质量分数1%SiO2或3%SiC均能够降低Ca0.85Ba0.15Zr4P6O24的热膨胀异向性,但与此同时,第二相的加入使Ca0.85Ba0.15Zr4P6O24的热膨胀系数有所上升。质量分数为1%～7%SiC晶须的加入反而导致NZP族陶瓷导热性能进一步降低,原因是SiC抑制了晶粒生长。     

Thermal Expansion of Homogeneous and Gradient Solid Solutions in the System KZr2(PO4)3─KTi2(PO4)3

Low-thermal-expansion ceramics having arbitrary thermal expansion coefficients were synthesized from homogeneous solid solutions in the system KZr₂(PO₄)₃─KTi₂(PO₄)₃ (KZP–KTP). Dense and strong ceramics were fabricated by sintering at 1100° to 1200°C with 2 wt% MgO. The thermal expansion coefficient increased from 0 to +3 × 10⁻⁶/°C with increasing x in KZr_{2 − x}Ti_x (PO₄)₃ (KZTP). In addition, a functionally gradient material with respect to thermal expansion was prepared by forming a series of KZTP solid solutions in a single ceramic body. By heating a pile of KZP and KTP ceramics in contact with each other, KZP and KTP bonded together to form a KZTP gradient solid solution near the interface.     

Effect of Substitution of Ca on Thermal Expansion of Cordierite (Mg2Al4Si5O18)

The effect of substitution of calcium on the anisotropic axial thermal expansion of cordierite was investigated by using a high-temperature X-ray diffraction technique. The compositions were prepared by the sol–gel route. In the Mg_{2- x} Ca _x -Al₄Si₅O₁₈ system, single-phase cordierite can be prepared for x up to 0.5. Thermal expansion anisotropy (α _a –α _c ) of cordierites reduces progressively by the substitution of increasing amounts of Ca for Mg.     

n(B2O3)/n(SiO2)对硼硅酸盐玻璃结构和性能的影响

采用热膨胀仪、扫描电镜和红外光谱仪研究了硼硅酸盐玻璃的结构与性能随n(B2O3)/n(SiO2)和n(B2O3)/n(Na2O)的变化规律,深入探讨了结构对分相、热膨胀系数和膨胀软化温度的影响规律。结果表明:热膨胀系数取决于玻璃中[BO3]、[BO4]和[SiO4]的数量变化;玻璃的转变温度和软化温度主要由SiO2决定;[BO3]对玻璃的分相有着重要的影响;不论n(B2O3)/n(Na2O)比值多少,玻璃结构中均存在[BO3]和被破坏的[SiO4]。     

Composition effects on elastic,thermal and corrosion properties of multiple-RE silicate (Ho1/4Er1/4Yb1/4Lu1/4)2SiO5 as a promising thermal and environmental barrier coating material

(Ho_1/4Er_1/4Yb_1/4Lu_1/4)₂SiO₅ is synthesized and characterized for the application of a promising multifunctional thermal and environmental barrier coating (TEBC) material. X-ray diffraction and scanning electron microscopy analysis indicate that a X2-type multiple-RE silicate (4RE_1/4)₂SiO₅ is formed with homogeneous distribution of the four rare earth species. Dense bulk sample exhibits excellent phase stability up to 1400 °C. Key properties including Young’s modulus, thermal conductivity and thermal expansion coefficient show interesting composition effects. Specially, (Ho_1/4Er_1/4Yb_1/4Lu_1/4)₂SiO₅ demonstrates higher elastic stiffness, lower thermal conductivity, lower thermal expansion coefficient and good resistances to molten CMAS and water vapor corrosions. These results confirm the strategy of multiple-RE engineering that may provide optimal property of advanced TEBCs.     

Ca1-xSrxSn4(PO4)6粉料的制备及膨胀特性

介绍了NZP晶体化学结构、组成、粉料制备、应用等方面的研究进展 ,并指出目前存在的问题。根据NZP晶体化学近零膨胀的特性 ,设计出 2个新的组成———SSP ,CSP及 3种固溶体。采用水热法和共沉淀法合成物相 ,并对粉体进行粒度分析 ,X ray衍射物相鉴定 ,IR结构分析 ,SEM形貌观察 ,测量了CSP/SSP热膨胀系数及力学强度     

Adjustment of Thermal Expansion of Cone 8 Glazes

Shivering of cone 8 zirconium-opacifled glazes for use on one-fire pyrophyllite wall tile and warping of the tile body were corrected by increasing the thermal expansion of the glazes. This was accomplished by (1) increasing the alkali content, (2) substituting strontium oxide for zinc oxide, (3) substituting calcium oxide for magnesium oxide, and (4) decreasing the silica-alumina ratio. The last method appeared to be the most effective. It is shown that the calculated coefficient of cubic thermal expansion is often unreliable as a value for the actual expansion. Expansions were obtained with a quartz-rod dilatometer.     

Preparation and Physical Properties of Radiofrequency-Sputtered Amorphous Films in the System AlPO4–TiO2

Amorphous films in the system AlPO₄–TiO₂ were prepared by an rf-sputtering method, and their physical properties, such as density, refractive index, and thermal expansion coefficient, and the infrared absorption spectra were measured. The thermal expansion coefficient increased linearly with increasing TiO₂ content. The results of the molar refractivity and the infrared absorption spectra indicated that the coordination number of titanium ions in these films is higher than that in SiO₂–TiO₂ glasses with a negative thermal expansion, in which Ti⁴⁺ ions are tetrahedrally coordinated. In order to confirm the coordination state of the titanium ions in these amorphous films, titanium K -band emission spectra were obtained by X-ray emission spectroscopy, revealing sixfold coordination. The higher coordination state of Ti⁴⁺ was considered to account for these amorphous films not exhibiting negative thermal expansion, as in the SiO₂–TiO₂ system.     

Thermal Expansion and Thermal Expansion Anisotropy of SiC Polytypes

The principal axial coefficients of thermal expansion for the (3C), (4H), and (6H) polytypes of SiC are considered to identify the structural role of the stacking layer sequence as it affects the thermal expansion. A general equation based on the fractions of cubic and hexagonal layer stacking is developed that expresses the principal axial thermal expansion coefficients of all of the SiC polytypes. It is then applied to address the thermal expansion anisotropy of the noncubic SiC structures.