JP2021155304A - 固体組成物の製造方法および機能性セラミックスの製造方法 - Google Patents
固体組成物の製造方法および機能性セラミックスの製造方法 Download PDFInfo
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- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 2
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
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- ZCOUZNWQYNAYNR-UHFFFAOYSA-N barium(2+);butan-2-olate Chemical compound [Ba+2].CCC(C)[O-].CCC(C)[O-] ZCOUZNWQYNAYNR-UHFFFAOYSA-N 0.000 description 1
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- ZCKXRHNLRWLPLJ-UHFFFAOYSA-N barium(2+);propan-1-olate Chemical compound [Ba+2].CCC[O-].CCC[O-] ZCKXRHNLRWLPLJ-UHFFFAOYSA-N 0.000 description 1
- CPUJSIVIXCTVEI-UHFFFAOYSA-N barium(2+);propan-2-olate Chemical compound [Ba+2].CC(C)[O-].CC(C)[O-] CPUJSIVIXCTVEI-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
前記第1の結晶相とは異なる第2の結晶相で構成される酸化物を製造する工程と、
前記酸化物とオキソ酸化合物とを混合する工程とを有する。
前記固体組成物を700℃以上1000℃以下の温度で加熱する工程とを有する。
[1]固体組成物
まず、本発明の固体組成物の製造方法に先立って、本発明に係る固体組成物、すなわち、本発明の固体組成物の製造方法を用いて製造される固体組成物について説明する。
これに対し、上記のような条件を満たさない場合には、満足のいく結果が得られない。
なお、本発明において、常温常圧とは、25℃、1気圧のことを言う。
本発明に係る固体組成物は、当該固体組成物を用いて形成される機能性セラミックスとは、異なる結晶相の酸化物を含む。以下、前記酸化物を「前駆酸化物」ともいう。また、本発明において、結晶相について「異なる」とは、結晶相の型が同一でないことの他、型が同じでも少なくとも1つの格子定数が異なるもの等をも含む広い概念である。また、機能性セラミックスについては、後に詳述する。
これにより、本発明に係る固体組成物を用いて機能性セラミックスを製造する際、すなわち、高温結晶相が生成する際に経る結晶相遷移が実質的に1回になるため、結晶相転移にともなう元素の偏析や熱分解による夾雑結晶の生成が抑制され、製造される機能性セラミックスの各種特性、例えば、光学的、電気的、機械的等の特性がさらに向上する。
本発明に係る固体組成物は、オキソ酸化合物を含む。
オキソ酸化合物を構成するオキソアニオンは、金属元素を含まないものであり、例えば、ハロゲンオキソ酸;ホウ酸イオン;炭酸イオン;オルト炭酸イオン;カルボン酸イオン;ケイ酸イオン;亜硝酸イオン;硝酸イオン;亜リン酸イオン;リン酸イオン;ヒ酸イオン;亜硫酸イオン;硫酸イオン;スルホン酸イオン;スルフィン酸イオン等が挙げられる。ハロゲンオキソ酸としては、例えば、次亜塩素酸イオン、亜塩素酸イオン、塩素酸イオン、過塩素酸イオン、次亜臭素酸イオン、亜臭素酸イオン、臭素酸イオン、過臭素酸イオン、次亜ヨウ素酸イオン、亜ヨウ素酸イオン、ヨウ素酸イオン、過ヨウ素酸イオン等が挙げられる。
本発明に係る固体組成物は、前述したような、前駆酸化物およびオキソ酸化合物を含んでいるが、さらに、これら以外の成分を含んでいてもよい。以下、本発明に係る固体組成物を構成する成分のうち、前駆酸化物、オキソ酸化合物以外の成分を「その他の成分」という。
次に、本発明の固体組成物の製造方法について説明する。
以下、各工程について詳細に説明する。
前駆酸化物製造工程では、最終的に得るべき機能性セラミックスの結晶相、すなわち、第1の結晶相とは異なる結晶相、すなわち、第2の結晶相で構成される酸化物である前駆酸化物を製造する。
これにより、より安定的に前駆酸化物を得ることができる。
金属化合物溶液調製工程では、前駆酸化物を構成する金属元素を分子内に含む金属化合物および溶媒を含有する金属化合物溶液を調製する。
また、同一の金属元素について、2種以上の金属化合物を用いてもよい。
上記のようにして用意した金属化合物溶液に対して、第1の熱処理を施す。これにより、金属化合物溶液は、通常、ゲル化する。
その後、第1の熱処理により得られた組成物、すなわち、ゲル状の組成物に対して、第2の熱処理を施す。
これにより、前駆酸化物が得られる。
オキソ酸化合物混合工程では、前駆酸化物製造工程で得られた前駆酸化物とオキソ酸化合物とを混合する。
本工程では、前駆酸化物およびオキソ酸化合物以外に、他の成分を用いてもよい。
次に、本発明の機能性セラミックスの製造方法について説明する。
これにより、前述した効果がより顕著に発揮される。
これにより、前述した効果がより顕著に発揮される。
本発明に係る機能性セラミックスは、前述したような製造方法により得ることができる。ここで、機能性セラミックスとは、光学的機能、磁性的機能、電気的機能、化学的機能、熱力学的機能等の何らかの機能を有するセラミックスのことを言う。
[5]固体組成物の製造
(実施例1)
本実施例では、以下のようにして、組成Y2.91Ce0.09Al5O12で示される機能性セラミックスの製造に用いる固体組成物を製造した。
金属化合物溶液の調製に用いる原料の種類、使用量を変更することにより、金属化合物溶液の組成が表1〜表3に示すものとなるようにするとともに、当該金属化合物溶液から得られた前駆酸化物と混合するオキソ酸化合物の種類、使用量、第1の熱処理、第2の熱処理の条件を表1〜表3に示すようにした以外は、前記実施例1と同様にして固体組成物を製造した。
金属化合物溶液の調製に用いる原料の種類、使用量を変更することにより、金属化合物溶液の組成が表4に示すものとなるようにするとともに、当該金属化合物溶液から得られた前駆酸化物とオキソ酸化合物とを混合する工程、および、その後の熱処理の工程を省略した以外は、前記実施例1と同様にして固体組成物を製造した。すなわち、比較例1〜3に係る固体組成物は、オキソ酸化合物を含んでいない。
Y2O3粉末:4.57質量部、CeO2粉末:0.216質量部およびAl2O3粉末:3.55質量部を秤量し、これらをメノウ鉢で粉砕しながら十分に混合することにより、混合粉末を得た。
原料粉末の組成およびこれらの混合比を変更した以外は、前記比較例4と同様にして固体組成物を製造した。
前記各実施例および各比較例に係る固体組成物を用いて、以下のようにして機能性セラミックスを製造した。
次に、これらの各サンプルを、それぞれ、Specac社製の内径13mmの排気ポート付きペレットダイスに充填し、6kNの加重でプレス成型して成形物としてのペレットを得た。得られたペレットをアルミナ製の坩堝に納め、大気雰囲気において900℃で8時間焼成してペレット状の機能性セラミックスを得た。
[7−1]内部量子収率評価
上記[6]で製造した機能性セラミックスのうち、実施例1〜4および比較例1、4に係る機能性セラミックスについて、以下のような評価を行った。
これらの結果を表7にまとめて示す。
上記[6]で製造した機能性セラミックスのうち、実施例5〜8および比較例2、5に係る機能性セラミックスについて、以下のような評価を行った。
これらの結果を表8にまとめて示す。
上記[6]で製造した機能性セラミックスのうち、実施例9〜12および比較例3、6に係る機能性セラミックスについて、以下のような評価を行った。
これらの結果を表9にまとめて示す。
Claims (9)
- 第1の結晶相を有する機能性セラミックスの形成に用いられる固体組成物を製造する方法であって、
前記第1の結晶相とは異なる第2の結晶相で構成される酸化物を製造する工程と、
前記酸化物とオキソ酸化合物とを混合する工程とを有することを特徴とする固体組成物の製造方法。 - 前記酸化物を製造する工程は、原料物質としての複数種の金属化合物を複数種含む混合物に対して、熱処理を施すことにより行う請求項1に記載の固体組成物の製造方法。
- 前記固体組成物中における前記酸化物の含有率をXP[質量%]、前記固体組成物中における前記オキソ酸化合物の含有率をXO[質量%]としたとき、0.001≦XO/XP≦4.00の関係を満足するように前記酸化物と前記オキソ酸化合物とを混合する請求項1または2に記載の固体組成物の製造方法。
- 前記オキソ酸化合物は、オキソアニオンとして、硝酸イオン、硫酸イオンのうちの少なくとも一方を含む請求項1ないし3のいずれか1項に記載の固体組成物の製造方法。
- 前記第2の結晶相がペロブスカイト型結晶であり、
前記第1の結晶相が立方晶ガーネット型結晶である請求項1ないし4のいずれか1項に記載の固体組成物の製造方法。 - 前記第2の結晶相が立方晶型結晶であり、
前記第1の結晶相がペロブスカイト型結晶である請求項1ないし4のいずれか1項に記載の固体組成物の製造方法。 - 前記第2の結晶相がYFeO3型結晶であり、
前記第1の結晶相がガーネット型結晶である請求項1ないし4のいずれか1項に記載の固体組成物の製造方法。 - 前記酸化物の結晶粒径が10nm以上200nm以下である請求項1ないし7のいずれか1項に記載の固体組成物の製造方法。
- 請求項1ないし8のいずれか1項に記載の方法により固体組成物を製造する工程と、
前記固体組成物を700℃以上1000℃以下の温度で加熱する工程とを有することを特徴とする機能性セラミックスの製造方法。
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