Input:
Samples of composition Mn 54-x Al 46 C x (x = 0, 1, 2, 3) were produced by argon arc-melting. The as-prepared ingots were used to prepare ribbon samples by a single-roller melt spinning technique under argon atmosphere at a wheel speed of 15 m/s. To get the magnetic MnAl phase, the as-spun ribbons were annealed at 450 °C for 45 min under argon atmosphere, while the as-prepared ingots were annealed at 1050 °C for two days under argon atmosphere and were then cooled in air.

Output:
[
  {
    "label": "mn54-xal46cx_arc-melted",
    "@graph": [
      {
        "@type": "Entity",
        "@id": "e1",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Mn" }]
      },
      {
        "@type": "Entity",
        "@id": "e2",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Al" }]
      },
      {
        "@type": "Entity",
        "@id": "e3",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "C" }]
      },
      {
        "@type": "Activity",
        "@id": "a1",
        "label": [{ "@value": "arc-melting" }],
        "matprov:atmosphere": [{ "@value": "argon" }],
        "matprov:concentration": [{ "@value": "0, 1, 2, 3" }]
      },
      {
        "@type": "Entity",
        "@id": "e4",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "arc-melted sample" }],
        "matprov:form": [{ "@value": "ingot" }]
      },
      { "@type": "Usage", "activity": "a1", "entity": "e1" },
      { "@type": "Usage", "activity": "a1", "entity": "e2" },
      { "@type": "Usage", "activity": "a1", "entity": "e3" },
      { "@type": "Generation", "activity": "a1", "entity": "e4" },
      {
        "@type": "Activity",
        "@id": "a2",
        "label": [{ "@value": "annealing" }],
        "matprov:temperature": [{ "@value": "1050 °C" }],
        "matprov:duration": [{ "@value": "2 days" }],
        "matprov:atmosphere": [{ "@value": "argon" }]
      },
      {
        "@type": "Entity",
        "@id": "e5",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "annealed sample" }],
        "matprov:form": [{ "@value": "ingot" }]
      },
      { "@type": "Usage", "activity": "a2", "entity": "e4" },
      { "@type": "Generation", "activity": "a2", "entity": "e5" },
      {
        "@type": "Activity",
        "@id": "a5",
        "label": [{ "@value": "cooling" }],
        "matprov:atmosphere": [{ "@value": "air" }]
      },
      {
        "@type": "Entity",
        "@id": "e8",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "cooled sample" }],
        "matprov:form": [{ "@value": "ingot" }]
      },
      { "@type": "Usage", "activity": "a5", "entity": "e5" },
      { "@type": "Generation", "activity": "a5", "entity": "e8" }
    ]
  },
  {
    "label": "mn54-xal46cx_single-roller-melt-spun",
    "@graph": [
      {
        "@type": "Entity",
        "@id": "e1",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Mn" }]
      },
      {
        "@type": "Entity",
        "@id": "e2",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "Al" }]
      },
      {
        "@type": "Entity",
        "@id": "e3",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "C" }]
      },
      {
        "@type": "Activity",
        "@id": "a1",
        "label": [{ "@value": "arc melting" }],
        "matprov:atmosphere": [{ "@value": "argon" }],
        "matprov:concentration": [{ "@value": "0, 1, 2, 3" }]
      },
      {
        "@type": "Entity",
        "@id": "e4",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "arc-melted sample" }],
        "matprov:form": [{ "@value": "ingot" }]
      },
      { "@type": "Usage", "activity": "a1", "entity": "e1" },
      { "@type": "Usage", "activity": "a1", "entity": "e2" },
      { "@type": "Usage", "activity": "a1", "entity": "e3" },
      { "@type": "Generation", "activity": "a1", "entity": "e4" },
      {
        "@type": "Activity",
        "@id": "a3",
        "label": [{ "@value": "single-roller melt spinning" }],
        "matprov:atmosphere": [{ "@value": "argon" }]
      },
      {
        "@type": "Entity",
        "@id": "e6",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "single-roller melt-spun sample" }],
        "matprov:form": [{ "@value": "ribbon" }]
      },
      { "@type": "Usage", "activity": "a3", "entity": "e4" },
      { "@type": "Generation", "activity": "a3", "entity": "e6" },
      {
        "@type": "Activity",
        "@id": "a4",
        "label": [{ "@value": "annealing" }],
        "matprov:temperature": [{ "@value": "450 °C" }],
        "matprov:duration": [{ "@value": "45 min" }],
        "matprov:atmosphere": [{ "@value": "argon" }]
      },
      {
        "@type": "Entity",
        "@id": "e7",
        "type": [{ "@value": "material" }],
        "label": [{ "@value": "annealed sample" }],
        "matprov:form": [{ "@value": "ribbon" }]
      },
      { "@type": "Usage", "activity": "a4", "entity": "e6" },
      { "@type": "Generation", "activity": "a4", "entity": "e7" }
    ]
  }
]