Glass ceramic having specific thermal expansion characteristics

LAS glass ceramic having an average coefficient of thermal expansion CTE in the range from 0 to 50° C. of not more than 0±0.1×10−6/K and thermal hysteresis at least within the temperature range from 10° C. to 35° C. of <0.1 ppm, and comprising the following components (in mol % based on oxide):

• SiO2
• 60-71
• Li2O
• 7-9.4
• MgO + ZnO
• 0-<0.6
• at least one component selected from the group consisting of P2O5, R2O, where R2O may be Na2O and/or K2O and/or Cs2O and/or Rb2O, and RO, where RO may be CaO and/or BaO and/or SrO, and
• nucleating agent in a content of 1.5 to 6 mol %, where nucleating agent is at least one component selected from the group consisting of TiO2, ZrO2, Ta2O5, Nb2O5, SnO2, MoO3, WO3, HfO2,
• wherein the LAS glass ceramic contains not more than 0.05 mol % As2O3 as refining agent.