JP7056843B2 - 金属置換型酸化チタン、及び金属置換型酸化チタン焼結体の製造方法 - Google Patents
金属置換型酸化チタン、及び金属置換型酸化チタン焼結体の製造方法 Download PDFInfo
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Description
(1)本発明の金属置換型酸化チタンの概要
本発明の金属置換型酸化チタンは、特許第5398025号で示すTi3O5(以下、λ-Ti3O5と呼ぶ)のTiサイトの一部を、Mg,Mn,Al,V,Nbのいずれか1種で置換したλ-Ti3O5型の構造からなり、λ-Ti3O5と同様に、0~800[K]の全ての温度で常磁性を示し、460[K]以下になっても、常磁性金属状態を維持した単斜晶系の結晶構造(以下、この結晶構造をλ相とも呼ぶ)となり得る。
図1は、Ti3O5のTiサイトの一部をMgで置換した金属置換型酸化チタンからなる金属置換型酸化チタン焼結体のSEM(Scanning Electron Microscope)画像であり、金属置換型酸化チタン焼結体は、例えば粒径が200~650[nm]程度の大きさでなり、複数の微細な粒子体が結合して表面が凹凸状に形成された多孔質構造からなる。なお、粒径の測定は、SEM画像の解析で行った。
次に、MgxTi(3-x)O5からなる金属置換型酸化チタンを、上述した「(1)本発明の金属置換型酸化チタンの概要」の製造方法に従って製造し、金属置換型酸化チタンのX線回折パターンについて確認した。具体的には、X線粒径が約7[nm]程度のTiO2粒子を30[wt%]の濃度で硝酸水溶液に混入させたゾル状の分散液(石原産業株式会社製の商品名「STS-01」)を用意した。
以上の構成において、本発明では、TiO2粒子とMgとが所定の含有量で含有された混合溶液を作製し、当該混合溶液内にTiO2及びMgからなる粒子を生成し、混合溶液内から抽出した粒子からなる前駆体粉末を水素雰囲気下で焼成することで、Ti3O5のTiサイトの一部を、Mgで置換した金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造できる。
図4は、Ti3O5のTiサイトの一部をMnで置換した金属置換型酸化チタンからなる金属置換型酸化チタン焼結体1のSEM画像であり、金属置換型酸化チタン焼結体は、例えば粒径が250~1100[nm]程度の大きさでなり、複数の微細な粒子体が結合して表面が凹凸状に形成された多孔質構造からなる。なお、粒径の測定は、SEM画像の解析で行った。
次に、MnxTi(3-x)O5からなる金属置換型酸化チタンを、上述した「(1)本発明の金属置換型酸化チタンの概要」の製造方法に従って製造し、金属置換型酸化チタンのX線回折パターンについて確認した。具体的には、X線粒径が約7[nm]程度のTiO2粒子を30[wt%]の濃度で硝酸水溶液に混入させたゾル状の分散液(石原産業株式会社製の商品名「STS-01」)を用意した。
以上の構成において、本発明では、TiO2粒子とMnとが所定の含有量で含有された混合溶液を作製し、当該混合溶液内にTiO2及びMnからなる粒子を生成し、混合溶液内から抽出した粒子からなる前駆体粉末を水素雰囲気下で焼成することで、Ti3O5のTiサイトの一部を、Mnで置換した金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造できる。
次に、Ti3O5のTiサイトの一部をAlで置換した金属置換型酸化チタンについて説明する。この金属置換型酸化チタンは、Ti3+ 2Ti4+05の組成でなるλ-Ti3O5のうち1つのTi3+を、Al3+で置換した組成でなり、例えばAlxTi(3-x)O5(0<X≦0.51)の組成からなる。このAlxTi(3-x)O5からなる金属置換型酸化チタンも、λ-Ti3O5と同様に、460[K]以下の温度において、X線回折にてλ-Ti3O5のX線回折ピークが出現しており、常磁性金属状態を維持した単斜晶系の結晶構造となり得る。
次に、AlxTi(3-x)O5からなる金属置換型酸化チタンを、上述した「(1)本発明の金属置換型酸化チタンの概要」の製造方法に従って製造し、金属置換型酸化チタンのX線回折パターンについて確認した。具体的には、X線粒径が約7[nm]程度のTiO2粒子を30[wt%]の濃度で硝酸水溶液に混入させたゾル状の分散液(石原産業株式会社製の商品名「STS-01」)を用意した。
以上の構成において、本発明では、TiO2粒子とAlとが所定の含有量で含有された混合溶液を作製し、当該混合溶液内にTiO2及びAlからなる粒子を生成し、混合溶液内から抽出した粒子からなる前駆体粉末を水素雰囲気下で焼成することで、Ti3O5のTiサイトの一部を、Alで置換した金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造できる。
次に、Ti3O5のTiサイトの一部をVで置換した金属置換型酸化チタンについて説明する。この金属置換型酸化チタンは、Ti3+ 2Ti4+05の組成でなるλ-Ti3O5のうち2つのTi3+を、V2+とTi4+とで置換した組成でなり、例えばVxTi(3-x)O5(0<X≦0.18)の組成からなる。このVxTi(3-x)O5からなる金属置換型酸化チタンも、λ-Ti3O5と同様に、460[K]以下の温度において、X線回折にてλ-Ti3O5のX線回折ピークが出現し、常磁性金属状態を維持した単斜晶系の結晶構造となり得る。
次に、Ti3O5のTiサイトの一部をNbで置換した金属置換型酸化チタンについて説明する。この金属置換型酸化チタンは、Ti3+ 2Ti4+05の組成でなるλ-Ti3O5のうち1つのTi3+を、Nb3+とで置換した組成でなり、例えばNbxTi(3-x)O5(0<X≦0.18)の組成からなる。このNbxTi(3-x)O5からなる金属置換型酸化チタンも、λ-Ti3O5と同様に、460[K]以下の温度において、X線回折にてλ-Ti3O5のX線回折ピークが出現し、常磁性金属状態を維持した単斜晶系の結晶構造となり得る。
ここでは、上述した「(2)Ti3O5のTiサイトの一部をMgで置換した金属置換型酸化チタン」について、xの値を変えて、SQUID(Superconducting quantum interference device)により磁化を測定し、また、DSC(Differential scanning calorimetry)により結晶構造の相転移温度を調べた。上述した「(2-1)検証試験」と同じ製造方法によって、xの値が異なるMgxTi(3-x)O5の金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造した。そして、各金属置換型酸化チタン焼結体からなる焼結粉末体を試料として用意した。
ここでは、上述した「(3)Ti3O5のTiサイトの一部をMnで置換した金属置換型酸化チタン」について、xの値をx=0.015、x=0.028、及びx=0.034と変えて、DSCにより結晶構造の相転移温度を調べた。上述した「(3-1)検証試験」と同じ製造方法によって、xの値が異なるMnxTi(3-x)O5の金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造した。そして、各金属置換型酸化チタン焼結体からなる焼結粉末体を試料として用意した。
ここでは、上述した「(4)Ti3O5のTiサイトの一部をAlで置換した金属置換型酸化チタン」について、xの値をx=0.004、x=0.007、及びx=0.023と変えて、DSCにより結晶構造の相転移温度を調べた。上述した「(4-1)検証試験」と同じ製造方法によって、AlxTi(3-x)O5のxの値が異なる金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造した。そして、各金属置換型酸化チタン焼結体からなる焼結粉末体を試料として用意した。
Claims (9)
- Ti3O5のTiサイトの一部を、Mn,Alのいずれか1種で置換した組成からなり、
460[K]以下になっても非磁性半導体の特性を有する結晶構造には相転移せずに、0~800[K]の全ての温度で常磁性金属状態を維持し、圧力又は光が与えられることにより、非磁性半導体の結晶構造に相転移する結晶構造からなる
ことを特徴とする金属置換型酸化チタン。 - AxTi(3-x)O5からなり、AがMnであり、xが0<x≦0.18である
ことを特徴とする請求項1に記載の金属置換型酸化チタン。 - AxTi(3-x)O5からなり、AがAlであり、xが0<x≦0.51である
ことを特徴とする請求項1に記載の金属置換型酸化チタン。 - 前記圧力又は前記光が与えられる前の前記常磁性金属状態を維持した結晶構造には、X線回折にてβ-Ti3O5のX線回折ピークが出現していない
ことを特徴とする請求項1~3のいずれか1項に記載の金属置換型酸化チタン。 - 前記圧力又は前記光が与えられることにより、非磁性半導体に相転移した結晶構造には、X線回折にてβ-Ti3O5のX線回折ピークが出現する
ことを特徴とする請求項1~4のいずれか1項に記載の金属置換型酸化チタン。 - 前記圧力又は前記光が与えられることにより、非磁性半導体に相転移した結晶構造は、前記常磁性金属状態の結晶構造が460[K]以下のときに有する磁化よりも低い磁化となる
ことを特徴とする請求項1~5のいずれか1項に記載の金属置換型酸化チタン。 - TiO2粒子が分散した分散液に、A(AはMg,Mnのいずれか1種)を含有した溶液を混合して、混合溶液内にTiO2及び前記Aからなる粒子を生成する生成工程と、
前記混合溶液内から抽出した粒子からなる前駆体粉末を水素雰囲気下で焼成し、Ti3O5のTiサイトの一部を、前記Aで置換した金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造する焼成工程と
を備え、
前記生成工程では、
前記混合溶液内での前記AとTiとの原子数比がA:Ti=0より上:100未満~6:94である
ことを特徴とする金属置換型酸化チタン焼結体の製造方法。 - TiO2粒子が分散した分散液に、A(AはAl)を含有した溶液を混合して、混合溶液内にTiO2及び前記Aからなる粒子を生成する生成工程と、
前記混合溶液内から抽出した粒子からなる前駆体粉末を水素雰囲気下で焼成し、Ti3O5のTiサイトの一部を、前記Aで置換した金属置換型酸化チタンからなる金属置換型酸化チタン焼結体を製造する焼成工程と
を備え、
前記生成工程では、
前記混合溶液内での前記AとTiとの原子数比がA:Ti=0より上:100未満~10:90である
ことを特徴とする金属置換型酸化チタン焼結体の製造方法。 - 前記焼成工程は、0.05~0.9[L/min]の水素雰囲気下で、900~1500[℃]で焼成する
ことを特徴とする請求項7又は8に記載の金属置換型酸化チタン焼結体の製造方法。
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