WO2019150732A1 - シュウ酸銀 - Google Patents
シュウ酸銀 Download PDFInfo
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- WO2019150732A1 WO2019150732A1 PCT/JP2018/043751 JP2018043751W WO2019150732A1 WO 2019150732 A1 WO2019150732 A1 WO 2019150732A1 JP 2018043751 W JP2018043751 W JP 2018043751W WO 2019150732 A1 WO2019150732 A1 WO 2019150732A1
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- silver oxalate
- silver
- oxalate
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- thermal stability
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- XNGYKPINNDWGGF-UHFFFAOYSA-L silver oxalate Chemical compound [Ag+].[Ag+].[O-]C(=O)C([O-])=O XNGYKPINNDWGGF-UHFFFAOYSA-L 0.000 title claims abstract description 82
- 238000002411 thermogravimetry Methods 0.000 claims abstract description 29
- 238000004455 differential thermal analysis Methods 0.000 claims abstract description 27
- 230000004580 weight loss Effects 0.000 claims abstract description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 27
- 235000006408 oxalic acid Nutrition 0.000 claims description 9
- 229910052709 silver Inorganic materials 0.000 claims description 9
- 239000004332 silver Substances 0.000 claims description 9
- 238000000634 powder X-ray diffraction Methods 0.000 claims description 6
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 36
- 239000007864 aqueous solution Substances 0.000 description 30
- 239000013078 crystal Substances 0.000 description 19
- 229910001961 silver nitrate Inorganic materials 0.000 description 18
- 239000007788 liquid Substances 0.000 description 16
- 238000002441 X-ray diffraction Methods 0.000 description 15
- GEVPUGOOGXGPIO-UHFFFAOYSA-N oxalic acid;dihydrate Chemical compound O.O.OC(=O)C(O)=O GEVPUGOOGXGPIO-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 238000002050 diffraction method Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 9
- 238000003756 stirring Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000976 ink Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 239000010944 silver (metal) Substances 0.000 description 2
- 229940100890 silver compound Drugs 0.000 description 2
- 150000003379 silver compounds Chemical class 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- HDCUKDHYRMGLRT-UHFFFAOYSA-L [Ag+2].[O-]C(=O)C([O-])=O Chemical class [Ag+2].[O-]C(=O)C([O-])=O HDCUKDHYRMGLRT-UHFFFAOYSA-L 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005260 alpha ray Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- IRXRGVFLQOSHOH-UHFFFAOYSA-L dipotassium;oxalate Chemical compound [K+].[K+].[O-]C(=O)C([O-])=O IRXRGVFLQOSHOH-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010946 fine silver Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 oxalate ions Chemical class 0.000 description 1
- ZDYUUBIMAGBMPY-UHFFFAOYSA-N oxalic acid;hydrate Chemical compound O.OC(=O)C(O)=O ZDYUUBIMAGBMPY-UHFFFAOYSA-N 0.000 description 1
- PFPYHYZFFJJQFD-UHFFFAOYSA-N oxalic anhydride Chemical compound O=C1OC1=O PFPYHYZFFJJQFD-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C55/00—Saturated compounds having more than one carboxyl group bound to acyclic carbon atoms
- C07C55/02—Dicarboxylic acids
- C07C55/06—Oxalic acid
- C07C55/07—Salts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/41—Preparation of salts of carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F1/00—Compounds containing elements of Groups 1 or 11 of the Periodic Table
- C07F1/10—Silver compounds
Definitions
- the present invention relates to silver oxalate.
- silver (Ag) Since silver (Ag) has particularly excellent conductivity, it is used for applications such as conductive paste and conductive ink. When used in these applications, it will be processed into a silver form suitable for that application, but when producing various forms of silver, a silver compound according to the required properties is an intermediate. Used as
- silver oxalate (Ag 2 C 2 O 4 ), which is a silver compound, has been reported to be used as a precursor when producing silver particles and the like.
- Silver oxalate has the feature that it can be thermally decomposed at a relatively low temperature without the need of a reducing agent to produce fine silver particles, and oxalate ions (C 2 O 4 released at this time).
- 2- has the advantage that no impurities remain because it is removed as carbon dioxide.
- Patent Document 1 discloses that silver oxalate is produced by mixing a silver nitrate solution and potassium oxalate, and that silver oxalate having a low moisture content and easy to handle is deposited. Is described. Patent Document 2 describes that silver oxalate is suspended in an aqueous or organic solution to reduce explosibility and improve handling.
- An object of the embodiment of the present invention is to provide silver oxalate excellent in thermal stability.
- the silver oxalate according to the embodiment of the present invention has a 1% weight loss temperature of 190 ° C. or more in thermogravimetry. 2) The silver oxalate according to the embodiment of the present invention has a maximum temperature of 219 ° C. or higher in the differential thermal analysis. 3) The silver oxalate according to the embodiment of the present invention has a maximum peak intensity when 2 ⁇ is 17.2 ° ⁇ 3 ° or 28.8 ° ⁇ 3 ° in a powder X-ray diffraction pattern using CuK ⁇ - ray. Silver oxalate according to 1) or 2) above, characterized in that it is shown.
- 2 ⁇ is 17.2 ° ⁇ 3 °, 28.8 ° ⁇ 3 °, 29.8 ° ⁇ 3 in a powder X-ray diffraction pattern using CuK ⁇ rays. Described in 1) or 2) above, which exhibits a major peak at any of °, 32.3 ° ⁇ 3 °, 44.9 ° ⁇ 3 °, and 53.2 ° ⁇ 3 ° It is silver oxalate.
- silver oxalate excellent in thermal stability can be produced.
- FIG. 2 shows an XRD chart of silver oxalate according to an embodiment of the present invention.
- Silver oxalate is a material that requires careful handling because it begins to exotherm at 140 ° C or higher and explosively decomposes at 200 ° C or higher. In particular, since it decomposes explosively due to rapid heating, friction, and impact, and its power is extremely high, careful attention is required in production, storage, use, and the like. For this reason, silver oxalate that is easily used industrially is required by improving the thermal stability of silver oxalate and reducing the explosibility.
- Silver oxalate according to an embodiment of the present invention has excellent thermal stability and is characterized in that the 1% weight loss temperature in thermogravimetry (TG) shows a high value of 190 ° C. or higher.
- TG thermogravimetry
- the silver oxalate according to the embodiment of the present invention is thermally stable. It can be understood that it is remarkably superior. More preferably, the 1% weight loss temperature in thermogravimetry (TG) is 200 ° C. or higher.
- the silver oxalate according to the embodiment of the present invention has a high maximum temperature of 219 ° C. or higher in the differential thermal analysis (DTA).
- DTA differential thermal analysis
- the above-described silver oxalate excellent in thermal stability has a unique crystal structure.
- 2 ⁇ is 17.
- a maximum peak intensity is exhibited at 2 ° ⁇ 3 ° or 28.8 ° ⁇ 3 °.
- ⁇ 3 ° refers to a shift (shift) of the XRD peak position.
- the above-mentioned silver oxalate excellent in thermal stability has a 2 ⁇ of 17.2 ° ⁇ 3 °, 28.8 ° ⁇ 3 °, 29 in a powder X-ray diffraction (XRD) pattern using CuK ⁇ rays. It is characterized by showing major peaks at .8 ° ⁇ 3 °, 32.3 ° ⁇ 3 °, 44.9 ° ⁇ 3 °, and 53.2 ° ⁇ 3 °.
- the “major peak” means the fifth peak in descending order of the peak intensity.
- silver nitrate is dissolved in water to prepare a silver nitrate aqueous solution
- oxalic acid dihydrate is dissolved in water to prepare an oxalic acid aqueous solution.
- the silver concentration in the silver nitrate aqueous solution is 0.75 mol / L or more and 3 mol / L or less
- the oxalic acid concentration in the oxalic acid aqueous solution is 0.5 mol / L or more and 1 mol / L or less. If these concentrations are too low, it is difficult for silver oxalate excellent in thermal stability to precipitate.
- the thermal stability of silver oxalate may be reduced.
- the silver concentration in the aqueous silver nitrate solution is 2 mol / L or more and 3 mol / L or less
- the oxalic acid concentration in the oxalic acid aqueous solution is 0.5 mol / L or more and 0.8 mol / L or less.
- oxalic acid aqueous solution added to the silver nitrate aqueous solution using a metering pump, and mix and synthesize with stirring.
- the oxalic acid aqueous solution was dropped to prevent silver from being mixed into the silver oxalate from the manufacturing equipment.
- the silver acts as an oxidation catalyst, and the thermal stability of silver oxalate. May be adversely affected.
- the liquid temperature and the stirring and holding time during synthesis are particularly important. If the liquid temperature is less than 20 ° C., the solubility of silver nitrate and oxalic acid decreases. On the other hand, if the liquid temperature exceeds 40 ° C., the thermal stability of the synthesized silver oxalate decreases, so the liquid temperature is 20-40 ° C. It is preferable to do. Further, the stirring and holding time is preferably 30 minutes or more, and it depends on the liquid temperature. However, if the reaction is performed for a long time under suspension conditions, the thermal stability of silver oxalate tends to decrease. When the temperature is high, the stirring holding time is preferably within 4 hours.
- Example 1 To 500 ml of 2 mol / L silver nitrate aqueous solution, 625 ml of 0.8 mol / L oxalic acid dihydrate aqueous solution was dropped, mixed at a liquid temperature of 30 ° C., and stirred for 30 minutes. Thereafter, this was filtered, washed, and dried to obtain 150 g of silver oxalate crystals. Next, the obtained silver oxalate was subjected to powder X diffraction analysis (XRD). The result is shown in FIG. Thermogravimetric analysis (TG) and differential thermal analysis (DTA) were also performed. Table 1 summarizes the above results. As shown in Table 1, the silver oxalate of Example 1 had a specific crystal structure and was excellent in thermal stability.
- XRD powder X diffraction analysis
- Example 2 To 1000 ml of 1 mol / L silver nitrate aqueous solution, 625 ml of 0.8 mol / L oxalic acid dihydrate aqueous solution was added dropwise, mixed at a liquid temperature of 30 ° C., and stirred for 30 minutes. Thereafter, this was filtered, washed, and dried to obtain 150 g of silver oxalate crystals. The obtained silver oxalate was subjected to powder X diffraction analysis (XRD). The result is shown in FIG. Further, thermogravimetric analysis (TG) and differential thermal analysis (DTA) were also performed. Table 1 summarizes the above results. As shown in Table 1, the silver oxalate of Example 2 had a specific crystal structure and was excellent in thermal stability.
- XRD powder X diffraction analysis
- Example 3 To 1333 ml of a 0.75 mol / L silver nitrate aqueous solution, 625 ml of a 0.8 mol / L oxalic acid dihydrate aqueous solution was added dropwise, mixed at a liquid temperature of 30 ° C., and stirred for 30 minutes. Thereafter, this was filtered, washed, and dried to obtain 150 g of silver oxalate crystals. The obtained silver oxalate was subjected to powder X diffraction analysis (XRD). The result is shown in FIG. Further, thermogravimetric analysis (TG) and differential thermal analysis (DTA) were also performed. Table 1 summarizes the above results. As shown in Table 1, the silver oxalate of Example 3 had a unique crystal structure and was excellent in thermal stability.
- XRD powder X diffraction analysis
- Example 4 To 1333 ml of a 0.75 mol / L silver nitrate aqueous solution, 1000 ml of a 0.5 mol / L oxalic acid dihydrate aqueous solution was added dropwise, mixed at a liquid temperature of 30 ° C., and stirred for 30 minutes. Thereafter, this was filtered, washed, and dried to obtain 150 g of silver oxalate crystals. The obtained silver oxalate was subjected to powder X diffraction analysis (XRD). The result is shown in FIG. Further, thermogravimetric analysis (TG) and differential thermal analysis (DTA) were also performed. Table 1 summarizes the above results. As shown in Table 1, the silver oxalate of Example 4 had a unique crystal structure and was excellent in thermal stability.
- XRD powder X diffraction analysis
- Example 5 To 500 ml of 2 mol / L silver nitrate aqueous solution, 625 ml of 0.8 mol / L oxalic acid dihydrate aqueous solution was dropped, mixed at a liquid temperature of 30 ° C., and stirred and maintained for 24 hours. Thereafter, this was filtered, washed, and dried to obtain 150 g of silver oxalate crystals. Next, the obtained silver oxalate was subjected to powder X diffraction analysis (XRD). The result is shown in FIG. Thermogravimetric analysis (TG) and differential thermal analysis (DTA) were also performed. Table 1 summarizes the above results. As shown in Table 1, the silver oxalate of Example 5 had a unique crystal structure and was excellent in thermal stability.
- XRD powder X diffraction analysis
- Example 6 To 500 ml of 2 mol / L silver nitrate aqueous solution, 625 ml of 0.8 mol / L oxalic acid dihydrate aqueous solution was dropped, mixed at a liquid temperature of 40 ° C., and held for 4 hours with stirring. Thereafter, this was filtered, washed, and dried to obtain 150 g of silver oxalate crystals. Next, the obtained silver oxalate was subjected to powder X diffraction analysis (XRD). The result is shown in FIG. Thermogravimetric analysis (TG) and differential thermal analysis (DTA) were also performed. Table 1 summarizes the above results. As shown in Table 1, the silver oxalate of Example 6 had a specific crystal structure and was excellent in thermal stability.
- XRD powder X diffraction analysis
- silver oxalate excellent in thermal stability can be produced.
- Silver oxalate is useful as a precursor in the production of silver nanoparticles, and is particularly useful for conductive pastes and conductive inks using silver nanoparticles.
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Abstract
Description
2)本発明の実施形態に係るシュウ酸銀は、示差熱分析において、最大温度が219℃以上であることを特徴とする。
3)本発明の実施形態に係るシュウ酸銀は、CuKα線を用いた粉末X線回折パターンにおいて、2θが17.2°±3°または28.8°±3°で最大のピーク強度を示すことを特徴とする上記1)又は2)に記載のシュウ酸銀である。
4)本発明の実施形態に係るシュウ酸銀は、CuKα線を用いた粉末X線回折パターンにおいて、2θが17.2°±3°、28.8°±3°、29.8°±3°、32.3°±3°、44.9°±3°および、53.2°±3°のいずれかに、主要なピークを示すことを特徴とする上記1)又は2)に記載のシュウ酸銀である。
まず、硝酸銀を水に溶解して硝酸銀水溶液を調整し、また、シュウ酸・二水和物を水に溶解してシュウ酸水溶液を調整する。このとき、硝酸銀水溶液中の銀濃度は、0.75mol/L以上3mol/L以下とし、シュウ酸水溶液中のシュウ酸濃度は、0.5mol/L以上1mol/L以下とする。これらの濃度が低すぎると熱安定性に優れたシュウ酸銀が析出し難く、一方、これらの濃度が高すぎると、反応中に硝酸銀又はシュウ酸が析出して、シュウ酸銀中に混入し、シュウ酸銀の熱安定性を低下させることがある。好ましくは、硝酸銀水溶液中の銀濃度は2mol/L以上3mol/L以下、シュウ酸水溶液中のシュウ酸濃度は0.5mol/L以上0.8mol/L以下とする。
2mol/Lの硝酸銀水溶液500mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温30℃で混合し、30分間、撹拌保持した。その後、これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。次に、得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、実施例1のシュウ酸銀は、特有の結晶構造を有し、熱安定性に優れたものであった。
1mol/Lの硝酸銀水溶液1000mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温30℃で混合し、30分間、撹拌保持した。その後、これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また、熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、実施例2のシュウ酸銀は、特有の結晶構造を有し、熱安定性に優れたものであった。
0.75mol/Lの硝酸銀水溶液1333mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温30℃で混合し、30分間、撹拌保持した。その後これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また、熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、実施例3のシュウ酸銀は、特有の結晶構造を有し熱安定性に優れたものであった。
0.75mol/Lの硝酸銀水溶液1333mlに、0.5mol/Lのシュウ酸二水和物水溶液1000mlを滴下し、液温30℃で混合し、30分間、撹拌保持した。その後これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また、熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、実施例4のシュウ酸銀は、特有の結晶構造を有し熱安定性に優れたものであった。
2mol/Lの硝酸銀水溶液500mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温30℃で混合し、24時間、撹拌保持した。その後、これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。次に、得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、実施例5のシュウ酸銀は、特有の結晶構造を有し、熱安定性に優れたものであった。
2mol/Lの硝酸銀水溶液500mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温40℃で混合し、4時間、撹拌保持した。その後、これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。次に、得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、実施例6のシュウ酸銀は、特有の結晶構造を有し、熱安定性に優れたものであった。
0.5mol/Lの硝酸銀水溶液2000mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温30℃で混合し、30分間、撹拌保持した。その後これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また、熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、比較例1のシュウ酸銀は、実施例に比べて熱安定性に劣るものであった。
0.25mol/Lの硝酸銀水溶液4000mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温30℃で混合し、30分間、撹拌保持した。その後これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また、熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、比較例2のシュウ酸銀は、実施例に比べて熱安定性に劣るものであった。
0.1mol/Lの硝酸銀水溶液10000mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温30℃で混合し、30分間、撹拌保持した。その後、これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また、熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、比較例3のシュウ酸銀は、実施例に比べて熱安定性に劣るものであった。
2mol/Lの硝酸銀水溶液500mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温40℃で混合し、8時間、撹拌保持した。その後、これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。次に、得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、比較例4のシュウ酸銀は、実施例に比べて熱安定性に劣るものであった。
2mol/Lの硝酸銀水溶液500mlに、0.8mol/Lのシュウ酸二水和物水溶液625mlを滴下し、液温50℃で混合し、4時間、撹拌保持した。その後、これを濾過、洗浄した後、乾燥して、シュウ酸銀の結晶150gを得た。次に、得られたシュウ酸銀について、粉末X回折分析(XRD)を行った。その結果を図1に示す。また熱重量分析(TG)及び示差熱分析(DTA)についても行った。以上の結果をまとめたものを表1に示す。表1に示す通り、比較例5のシュウ酸銀は、実施例に比べて熱安定性に劣るものであった。
Claims (4)
- 熱重量測定において1%重量減温度が190℃以上であることを特徴とするシュウ酸銀。
- 示差熱分析において最大温度が219℃以上であることを特徴とするシュウ酸銀。
- CuKα線を用いた粉末X線回折パターンにおいて、2θが17.2°±3°または28.8°±3°で最大ピーク強度を示すことを特徴とする請求項1又は2に記載のシュウ酸銀。
- CuKα線を用いた粉末X線回折パターンにおいて、2θが17.2°±3°、28.8°±3°、29.8°±3°、32.3°±3°、44.9°±3°、および、53.2°±3°のいずれかに、主要なピークを示すことを特徴とする請求項1又は2に記載のシュウ酸銀。
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