Glass-ceramic articles with increased resistance to fracture and methods for making the same

A glass-ceramic article, comprising:

• a residual glass phase that is less than or equal to 50 wt % of the glass-ceramic article;
• a composition of the glass-ceramic article, based on 100 mol % of the glass-ceramic article, comprising:
• greater than or equal to 1.7 mol % ZrO2;
• from 60 mol % to 72 mol % SiO2;
• from 0 mol % to 6 mol % Al2O3;
• from 24 mol % to 32 mol % Li2O;
• from 0 mol % to 2 mol % B2O3;
• from 0 mol % to 2 mol % Na2O;
• and
• from 0 mol % to 2 mol % K2O,
• wherein the glass-ceramic article comprises a molar ratio Li2O (mol %)/R2O (mol %) from greater than or equal to 0.85 to less than or equal to 1.00, where R2O is a total amount of Li2O, Na2O, and K2O;
• a first surface of the glass-ceramic article;
• a compressive stress layer extending from the first surface of the glass-ceramic article to a depth of compression;
• and
• a stored tensile energy greater than 22 J/m2.

A glass-ceramic article, comprising:

• a residual glass phase that is less than or equal to 50 wt % of the glass-ceramic article;
• a composition of the glass-ceramic article, based on 100 mol % of the glass-ceramic article, comprising:
• greater than or equal to 1.7 mol % ZrO2;
• from 60 mol % to 72 mol % SiO2;
• from 0 mol % to 6 mol % Al2O3;
• from 24 mol % to 32 mol % Li2O;
• from 0 mol % to 2 mol % B2O3;
• from 0 mol % to 2 mol % Na2O;
• and
• from 0 mol % to 2 mol % K2O,
• wherein the glass-ceramic article comprises a molar ratio Li2O (mol %)/R2O (mol %) from greater than or equal to 0.85 to less than or equal to 1.00, where R2O is a total amount of Li2O, Na2O, and K2O;
• a first surface of the glass-ceramic article;
• optical retardance at room temperature of less than 40 nm per mm of thickness measured using a grey-field polariscope GFP-1400 photoelastic stress measurement system.