Input:
The ingot sample with nominal composition (Nd 10 Fe 67 B 23 ) 93 Nb 7 was produced by arc-melting of the high purity (min. 4 N) elements under low pressure of inert gas (Ar). Boron was added in the form of Fe-B alloy with a well-known composition. Ribbons were produced by the melt-spinning technique under low pressure of a protective atmosphere (Ar). Produced ribbons were sealed off in quart tubes under a low pressure of Ar gas and annealed in a wide range of temperatures for 5 min.

Output:
[
  {
    "label": "(Nd10Fe67B23)93Nb7_annealed",
    "@graph": [
      {
        "@type": "Entity",
        "@id": "e1",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Nd" }],
        "matprov:purity": [{ "@value": "min. 4 N" }]
      },
      {
        "@type": "Entity",
        "@id": "e2",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Fe" }],
        "matprov:purity": [{ "@value": "min. 4 N" }]
      },
      {
        "@type": "Entity",
        "@id": "e3",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Fe–B alloy" }]
      },
      {
        "@type": "Entity",
        "@id": "e4",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Nb" }],
        "matprov:purity": [{ "@value": "min. 4 N" }]
      },
      {
        "@type": "Activity",
        "@id": "a1",
        "label": [{ "@value": "arc-melting" }],
        "matprov:atmosphere": [{ "@value": "Ar" }],
        "matprov:pressure": [{ "@value": "low pressure" }]
      },
      { "@type": "Usage", "activity": "a1", "entity": "e1" },
      { "@type": "Usage", "activity": "a1", "entity": "e2" },
      { "@type": "Usage", "activity": "a1", "entity": "e3" },
      { "@type": "Usage", "activity": "a1", "entity": "e4" },
      { "@type": "Generation", "activity": "a1", "entity": "e5" },
      {
        "@type": "Entity",
        "@id": "e5",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "arc-melted sample" }]
      },
      {
        "@type": "Activity",
        "@id": "a2",
        "label": [{ "@value": "melt-spinning" }],
        "matprov:atmosphere": [{ "@value": "Ar" }],
        "matprov:pressure": [{ "@value": "low pressure" }]
      },
      { "@type": "Usage", "activity": "a2", "entity": "e5" },
      { "@type": "Generation", "activity": "a2", "entity": "e6" },
      {
        "@type": "Entity",
        "@id": "e6",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "melt-spun sample" }],
        "matprov:form": [{ "@value": "ribbon" }]
      },
      {
        "@type": "Activity",
        "@id": "a3",
        "label": [{ "@value": "sealing" }],
        "matprov:atmosphere": [{ "@value": "Ar" }],
        "matprov:pressure": [{ "@value": "low pressure" }]
      },
      { "@type": "Usage", "activity": "a3", "entity": "e6" },
      { "@type": "Generation", "activity": "a3", "entity": "e7" },
      {
        "@type": "Entity",
        "@id": "e7",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "sealed sample" }]
      },
      {
        "@type": "Entity",
        "@id": "e10",
        "type": [{ "@value": "tool" }],
        "label": [{ "@value": "quart tubes" }]
      },
      { "@type": "Usage", "activity": "a3", "entity": "e10" },
      {
        "@type": "Activity",
        "@id": "a4",
        "label": [{ "@value": "annealing" }],
        "matprov:temperature": [{ "@value": "wide range" }],
        "matprov:duration": [{ "@value": "5 min" }]
      },
      { "@type": "Usage", "activity": "a4", "entity": "e7" },
      { "@type": "Generation", "activity": "a4", "entity": "e8" },
      {
        "@type": "Entity",
        "@id": "e8",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "annealed sample" }]
      }
    ]
  }
]