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Yb2Si2O7 crystal whiskers and preparation method thereof

A whisker, 3·5H2O technology, applied in the field of Yb2Si2O7 whisker and its preparation, can solve the problems of harsh reaction conditions, complex preparation process, long reaction cycle, etc., and achieve shortened reaction time, simple process, easy shape and size Effect

Active Publication Date: 2016-07-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods have their unique advantages, but most of the disadvantages lie in the complex preparation process, long reaction cycle, harsh reaction conditions, and the need for post-crystallization treatment, etc.

Method used

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  • Yb2Si2O7 crystal whiskers and preparation method thereof
  • Yb2Si2O7 crystal whiskers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a Yb 2 Si 2 o 7 The preparation method of whisker, comprises the following steps:

[0029] 1) Weigh analytically pure Yb(NO) 3 ·5H 2 O, fully dissolved in absolute ethanol, prepared into a solution with a concentration of 0.05mol / L, and the obtained solution was designated as solution A.

[0030] 2) Take analytically pure TEOS (Si(OC 2 h 5 ) 4 ), according to Yb(NO) 3 ·5H 2 The molar ratio of O:TEOS=1:1, the measured amount of TEOS was added to the solution A, and the solution B was obtained after fully stirring for 1 hour.

[0031]3) Put solution B into a constant temperature reactor, control the temperature at 60°C, and dry for 10 hours to obtain powder A.

[0032] 4) Put the dried powder A into a crucible, place it in a muffle furnace at 200°C for 1 hour pre-calcination, wait for natural cooling to room temperature, and obtain powder B after taking it out.

[0033] 5) Choose commercially available analytically pure sodium chloride (NaCl) and potassium chlo...

Embodiment 2

[0036] a Yb 2 Si 2 o 7 The preparation method of whisker, comprises the following steps:

[0037] 1) Weigh analytically pure Yb(NO) 3 ·5H 2 O, fully dissolved in absolute ethanol, prepared into a solution with a concentration of 0.1mol / L, and the obtained solution was designated as solution A.

[0038] 2) Take analytically pure TEOS (Si(OC 2 h 5 ) 4 ), according to Yb(NO) 3 ·5H 2 The molar ratio of O:TEOS=1:1, the measured amount of TEOS was added to the solution A, and the solution B was obtained after fully stirring for 1.5h.

[0039] 3) Put solution B into a constant temperature reactor, control the temperature at 60°C, and dry for 8 hours to obtain powder A.

[0040] 4) Put the dried powder A into a crucible, place it in a muffle furnace at 200°C for pre-calcination for 2 hours, cool it down to room temperature naturally, and take it out to obtain powder B.

[0041] 5) Choose commercially available analytically pure sodium chloride (NaCl) and potassium chloride ...

Embodiment 3

[0044] a Yb 2 Si 2 o 7 The preparation method of whisker, comprises the following steps:

[0045] 1) Weigh analytically pure Yb(NO) 3 ·5H 2 O, fully dissolved in absolute ethanol, prepared into a solution with a concentration of 0.1mol / L, and the obtained solution was designated as solution A.

[0046] 2) Take analytically pure TEOS (Si(OC 2 h 5 ) 4 ), according to Yb(NO) 3 ·5H 2 The molar ratio of O:TEOS=1:1.5, the measured amount of TEOS was added to the solution A, and the solution B was obtained after fully stirring for 1 hour.

[0047] 3) Put solution B into a constant temperature reactor, control the temperature at 60°C, and dry for 8 hours to obtain powder A.

[0048] 4) Put the dried powder A into a crucible, place it in a muffle furnace at 200°C for pre-calcination for 3 hours, let it cool down to room temperature naturally, and take it out to obtain powder B.

[0049] 5) Choose commercially available analytically pure sodium chloride (NaCl) and potassium c...

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Abstract

The invention discloses Yb2Si2O7 crystal whiskers and a preparation method thereof, and belongs to the technical field of structural material preparation.The preparation method comprises the following steps that 1, Yb(NO)3.5H2O is taken to be dissolved in absolute ethyl alcohol to prepare a solution A with the concentration of 0.5-1 mol / L; 2, Si(OC2H5)4 is added into the solution A, and the materials are fully stirred to be uniform to prepare a solution B; 3, the solution B is dried to obtain powder A, the powder A is subjected to presintering treatment at 200 DEG C and then cooled to room temperature, and powder B is prepared; 4, the powder B and mixed complex salts are mixed to be uniform and then subjected to heat treatment at the temperature of 800 DEG C-1000 DEG C, and powder C is prepared; 5, the powder C is dissolved by adding water and subjected to centrifugal treatment, and precipitates are washed and dried to prepare the Yb2Si2O7 crystal whiskers.The method is easy to operate, mild in reaction condition and high in process controllability; the Yb2Si2O7 crystal whiskers prepared through the method are controllable in morphology, high in purity and uniform in particle size.

Description

technical field [0001] The invention belongs to the technical field of structural material preparation, and in particular relates to a Yb 2 Si 2 o 7 Whiskers and methods for their preparation. Background technique [0002] Ytterbium silicate (Yb 2 Si 2 o 7 ) belongs to monoclinic crystal system, belongs to C2 / m space group, and its lattice parameter is a=6.802 ,b=8.875 ,c=4.703 , the angle between crystal planes is β=102.070°, with α-Yb 2 Si 2 o 7 , β-Yb 2 Si 2 o 7 Two different monoclinic structures [CenZhao, FengWang, YinjieSun, YanchunZhou, Synthesis and characterization ofb-Yb 2 Si 2 o 7 powders[J]. Ceramics International, 2013, 39:5805-5811.]. Ytterbium silicate (Yb 2 Si 2 o 7 ) The structural characteristics of the material itself and a series of excellent physical and chemical properties, with low thermal expansion coefficient, good high temperature thermal stability and chemical stability, good corrosion resistance in water vapor environment, a...

Claims

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Application Information

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IPC IPC(8): C30B9/12C30B29/34C30B29/62
CPCC30B9/12C30B29/34C30B29/62
Inventor 曹丽云雍翔周磊黄剑锋李翠艳欧阳海波费杰吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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